10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

_______________________________________________ 

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period ended March 31, 2013

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                                          to                                         

Commission file number # 000-08866

_______________________________________________

MICROSEMI CORPORATION

(Exact name of Registrant as specified in its charter)

Delaware	95-2110371
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Enterprise, Aliso Viejo, California 92656

(Address of principal executive offices) (Zip Code)

(949) 380-6100

Registrant’s telephone number, including area code

_______________________________________________ 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding twelve months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No   o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every interactive data file required to be submitted and posted pursuant to Rule 405 of Regulation S-T (section 232.405 of this chapter) during the preceding twelve months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large Accelerated Filer   x	Accelerated Filer  o
Non-Accelerated Filer  o	Smaller Reporting Company  o

(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  o    No  x

The number of outstanding shares of Common Stock on April 16, 2013 was 92,913,870.

TABLE OF CONTENTS

Reference		Page
PART I.	FINANCIAL INFORMATION
ITEM 1.	Financial Statements	4
	Unaudited Consolidated Balance Sheet	5
	Unaudited Consolidated Statements of Operations and Comprehensive Income	6
	Unaudited Consolidated Statement of Cash Flows	7
	Condensed Notes to Unaudited Consolidated Financial Statements	8
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	24
ITEM 4.	Controls and Procedures	25
PART II.	OTHER INFORMATION
ITEM 1.	Legal Proceedings	25
ITEM 1A.	Risk Factors	26
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	40
ITEM 3.	Defaults upon Senior Securities	40
ITEM 4.	Mine Safety Disclosures	40
ITEM 5.	Other Information	40
ITEM 6.	Exhibits	40

2

IMPORTANT FACTORS RELATED TO FORWARD-LOOKING STATEMENTS AND ASSOCIATED RISKS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the federal securities laws. Any statements that do not relate to historical or current facts or matters are forward-looking statements. You can identify some of the forward-looking statements by the use of forward-looking words, such as “can,” “may,” “will,” “could,” “should,” “project,” “believe,” “anticipate,” “expect,” “plan,” “estimate,” “forecast,” “potential,” “intend,” “maintain,” “continue” and variations of these words and comparable words. In addition, all of the information herein that does not state a historical fact is forward-looking, including any statement or implication about an estimate or a judgment, or an expectation as to a future time, future result or other future circumstance. Statements concerning current conditions may also be forward-looking if they imply a continuation of current conditions. Examples of forward-looking statements in this Quarterly Report on Form 10-Q include, but are not limited to, statements concerning:

• expectations that we will be able to successfully integrate acquired companies and personnel with our existing operations;

• expectations that plant consolidations will result in anticipated cost savings without unanticipated costs or expenses;

• demand, growth and sales expectations for our products;

• expectations regarding tax exposures and future tax rates, our ability to realize deferred tax assetsand the effect of examinations by U.S., state or foreign jurisdictions;

• expectations regarding competitive conditions;

• new market opportunities and emerging applications for our products;

• the uncertainty of litigation, the costs and expenses of litigation, and the potential material adverse effect litigation could have on our business and results of operations;

• beliefs that our customers will not cancel orders or terminate or renegotiate their purchasing relationships with us;

• expectations that we will not suffer production delays as a result of a supplier's inability to supply parts;

• the effect of events such as natural disasters and related disruptions on our operations;

• beliefs that we stock adequate supplies of all materials;

• beliefs that we will be able to successfully resolve any disputes and other business matters as anticipated;

• beliefs that we will be able to meet our operating cash and capital commitment requirements in the foreseeable future;

• critical accounting estimates;

• expectations regarding our financial and operating results;

• expectations regarding our liquidity and capital resources, including our loan covenants;

• expectations regarding our performance and competitive position in future periods; and

• expectations regarding our outlook for our end markets.

Forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from the results that the forward-looking statements suggest. You are urged to carefully review the disclosures we make in this report concerning risks and other factors that may affect our business and operating results, including those made under the heading “Item 1A. RISK FACTORS” included below in this Quarterly Report on Form 10-Q, as well as in our other reports filed with the Securities and Exchange Commission (“SEC”). Forward-looking statements are not a guarantee of future performance and should not be regarded as a representation by us or any other person that all of our estimates will necessarily prove correct or that all of our objectives or plans will necessarily be achieved. You are cautioned, therefore, not to place undue reliance on these forward-looking statements, which are made only as of the date of this report. We do not intend, and undertake no obligation, to update or revise the forward-looking statements to reflect events or circumstances after the date of this report, whether as a result of new information, future events or otherwise.

3

PART I.     FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

The unaudited consolidated statements of operations and comprehensive income for the quarter and six months ended March 31, 2013 of Microsemi Corporation and its subsidiaries (which we herein sometimes refer to collectively as “Microsemi,” “the Company,” “we,” “our,” “ours” or “us”), the unaudited consolidated statement of cash flows for the six months ended March 31, 2013, and the comparative unaudited consolidated financial statements for the corresponding periods of the prior year, together with the unaudited consolidated balance sheets as of March 31, 2013 and September 30, 2012, are included herein.

The unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q, and therefore do not include all information and note disclosures necessary for a fair presentation of consolidated financial position, results of operations and cash flows in conformity with United States generally accepted accounting principles. The unaudited consolidated financial statements and notes thereto must be read in their entirety in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

4

MICROSEMI CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheet

(Unaudited, amounts in thousands)

	March 31, 2013			September 30, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	206,921		$	204,335
Accounts receivable, net of allowance for doubtful accounts of $1,475 at March 31, 2013 and $1,623 at September 30, 2012	158,403			153,190
Inventories, net	162,727			159,055
Deferred income taxes, net	20,361			20,361
Other current assets	29,599			24,400
Total current assets	578,011			561,341
Property and equipment, net	117,700			116,146
Goodwill	790,236			790,236
Intangible assets, net	357,173			399,991
Deferred income taxes, net	30,691			33,066
Other assets	29,737			33,850
TOTAL ASSETS	$	1,903,548		$	1,934,630
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	70,232		$	75,351
Accrued liabilities	65,599			80,224
Current maturity of long-term liabilities	1,070			903
Total current liabilities	136,901			156,478
Credit facility	725,975			775,975
Deferred income taxes	25,107			25,135
Other long-term liabilities	46,629			49,056
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $1.00 par value; authorized 1,000 shares; none issued	—			—
Common stock, $0.20 par value; 250,000 authorized, 92,855 issued and outstanding at March 31, 2013 and 90,282 issued and outstanding at September 30, 2012	18,571			18,056
Capital in excess of par value of common stock	707,852			678,905
Retained earnings	243,077			231,768
Accumulated other comprehensive (loss)	(564		)	(743		)
Total stockholders’ equity	968,936			927,986
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	1,903,548		$	1,934,630

The accompanying notes are an integral part of these statements.

5

MICROSEMI CORPORATION AND SUBSIDIARIES

Consolidated Statements of Operations and Comprehensive Income

(unaudited, amounts in thousands, except earnings per share)

	Quarter Ended						Six Months Ended
	March 31, 2013			April 1, 2012			March 31, 2013			April 1, 2012
Net sales	$	235,333		$	249,306		$	482,931		$	490,226
Cost of sales	101,868			117,438			206,893			232,622
Gross profit	133,465			131,868			276,038			257,604
Operating expenses:
Selling, general and administrative	52,316			51,971			103,669			106,687
Research and development costs	41,956			42,188			85,132			81,789
Amortization of intangible assets	21,110			26,472			42,820			51,334
Restructuring and severance charges	6,261			119			7,111			7,344
Total operating expenses	121,643			120,750			238,732			247,154
Operating income	11,822			11,118			37,306			10,450
Other income (expenses):
Interest expense, net	(7,744		)	(10,194		)	(16,105		)	(22,033		)
Other, net	(3,603		)	(1,035		)	(3,549		)	(33,439		)
Total other expense	(11,347		)	(11,229		)	(19,654		)	(55,472		)
Income (loss) before income taxes	475			(111		)	17,652			(45,022		)
Provision for income taxes	3,380			4,681			6,343			4,372
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309		$	(49,394	)
Earnings (loss) per share:
Basic	$	(0.03	)	$	(0.06	)	$	0.13		$	(0.58	)
Diluted	$	(0.03	)	$	(0.06	)	$	0.12		$	(0.58	)
Weighted-average common shares outstanding:
Basic	89,405			85,645			88,970			85,435
Diluted	89,405			85,645			90,538			85,435
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309		$	(49,394	)
Other comprehensive income (loss), net of tax:
Translation adjustment, net of tax	(7		)	(176		)	179			(115		)
Unrealized actuarial loss on pension benefits, net of tax	(42		)	—			(86		)	—
Other comprehensive income (loss)	(49		)	(176		)	93			(115		)
Total comprehensive income (loss)	$	(2,954	)	$	(4,968	)	$	11,402		$	(49,509	)

The accompanying notes are an integral part of these statements.

6

MICROSEMI CORPORATION AND SUBSIDIARIES

Consolidated Statement of Cash Flows

(unaudited, amounts in thousands)

	Six Months Ended
	March 31, 2013			April 1, 2012
Cash flows from operating activities:
Net income (loss)	$	11,309		$	(49,394	)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,385			68,302
Provision for doubtful accounts	(148		)	(284		)
Amortization of deferred financing cost	596			1,528
Settlement of foreign currency forward	—			(3,701		)
Loss on disposition or impairment of assets	—			1,513
Deferred income taxes	2,347			(997		)
Charge for stock based compensation	18,278			17,577
Effect of credit facility issuance and refinancing costs	2,615			29,275
Change in assets and liabilities (net of acquisitions and disposition):
Accounts receivable	(5,065		)	(15,251		)
Inventories	(3,672		)	15,641
Other current assets	(5,198		)	32,601
Other assets	1,751			(7,509		)
Accounts payable	(3,713		)	5,084
Accrued liabilities	(14,161		)	(56,263		)
Other long-term liabilities	(2,275		)	23,172
Net cash provided by operating activities	60,049			61,294
Cash flows from investing activities:
Purchases of property and equipment	(17,560		)	(26,675		)
Proceeds from the divestiture or sale of assets	—			325
Settlement of foreign currency forward	—			3,701
Payments for acquisitions, net of cash acquired	—			(584,218		)
Net cash used in investing activities	(17,560		)	(606,867		)
Cash flows from financing activities:
Repayments of credit facility	(50,000		)	(53,600		)
Credit facility issuance and refinancing costs	(623		)	(41,790		)
Proceeds from credit facility	277,539			959,708
Extinguishment of debt	(277,539		)	(470,296		)
Net proceeds from stock awards	10,720			6,324
Net cash (used in) provided by financing activities	(39,903		)	400,346
Net increase (decrease) in cash and cash equivalents	2,586			(145,227		)
Cash and cash equivalents at beginning of period	204,335			266,631
Cash and cash equivalents at end of period	$	206,921		$	121,404

The accompanying notes are an integral part of these statements.

7

MICROSEMI CORPORATION AND SUBSIDIARIES

CONDENSED NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

1. PRESENTATION OF FINANCIAL INFORMATION

The unaudited consolidated financial statements include the accounts of Microsemi Corporation and its subsidiaries. Intercompany transactions have been eliminated in consolidation.

The consolidated financial information furnished herein is unaudited, but in the opinion of our management, includes all adjustments (all of which are normal or recurring adjustments) necessary for a fair statement of the results of operations for the periods indicated. The results of operations for the most recently reported quarter and first six months of the current fiscal year are not necessarily indicative of the results to be expected for the full year.

The unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q, and therefore do not include all information and note disclosures necessary for a fair presentation of consolidated financial position, results of operations and cash flows in conformity with United States generally accepted accounting principles. The unaudited consolidated financial statements and notes thereto must be read in their entirety in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

The unaudited consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, which require us to make estimates and assumptions that may materially affect the reported amounts of assets and liabilities at the date of the unaudited consolidated financial statements and revenues and expenses during the periods reported. Actual results could differ materially from those estimates. Information with respect to our critical accounting policies that we believe could have the most significant effect on our reported results and require subjective or complex judgments is contained in the notes to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012. In referencing a year, we are referring to the fiscal year ended on the Sunday closest to September 30.

Earnings Per Share

Basic earnings per share have been computed based upon the weighted-average number of common shares outstanding during the respective periods. Diluted earnings per share have been computed, when the result is dilutive, using the treasury stock method for stock awards outstanding during the respective periods. Earnings per share were calculated as follows (amounts in thousands, except per share data):

	Quarter Ended						Six Months Ended
	March 31, 2013			April 1, 2012			March 31, 2013		April 1, 2012
Basic
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding	89,405			85,645			88,970		85,435
Basic earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.13	$	(0.58	)
Diluted
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding for basic	89,405			85,645			88,970		85,435
Dilutive effect of stock awards	—			—			1,568		—
Weighted-average common shares outstanding on a diluted basis	89,405			85,645			90,538		85,435
Diluted earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.12	$	(0.58	)

For the six months ended March 31, 2013, we excluded 4.9 million stock awards in the computation of diluted EPS as these stock awards would have been anti-dilutive. For the quarter ended March 31, 2013 and quarter and six months ended April 1, 2012, all stock awards were excluded as we reported a net loss in these periods.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

8

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Revision to Prior Year Consolidated Statement of Cash Flows 

During 2013, we revised our consolidated statement of cash flows to correct for an error in our 2012 presentation of excess tax benefits on stock awards. The correction resulted in an increase in cash flows from operating activities for the quarter ended January 1, 2012 of $0.4 million and a corresponding decrease in cash flows from financing activities for the same amount. The revision had no impact on our total cash flows or cash and cash equivalents.

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2011-11, the objective of which is to provide additional disclosures on the effect or potential effect of rights of setoff associated with an entity's recognized assets and recognized liabilities within the scope of the update. The update primarily impacts financial instruments and derivatives subject to a master netting arrangement or similar agreement. ASU No. 2011-11 is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. We are currently assessing the disclosures required under this ASU.

In February 2013, the FASB issued ASU No. 2013-04, the objective of which is to provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The guidance in the update requires that these arrangements be recorded as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors. ASU 2013-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. We are currently assessing the impact of this ASU on our consolidated financial position and results of operations.

2. INVENTORIES

Inventories are summarized as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
Raw materials	$	37,998	$	39,094
Work in progress	92,407		90,920
Finished goods	32,322		29,041
	$	162,727	$	159,055

3. GOODWILL AND INTANGIBLE ASSETS, NET

Goodwill and intangible assets, net consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Amortizable intangible assets
Completed technology	$	171,470	$	191,007
Customer relationships	183,795		205,145
Backlog	—		627
Other	1,908		3,212
	$	357,173	$	399,991
Non-amortizing intangible assets
Goodwill	790,236		790,236

Estimated amortization expense in each of the five succeeding years and thereafter is as follows (amounts in thousands):

	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter
Amortization expense	$	82,860	$	76,049	$	70,649	$	68,170	$	46,634	$	12,811

9

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

4. ACCRUED LIABILITIES

Accrued liabilities consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Payroll and benefits	$	23,246	$	43,219
Outside services	12,563		11,826
Restructuring and severance	8,737		8,277
Income taxes	3,475		1,036
Licenses	3,107		1,688
Warranties	2,686		2,472
Deferred revenue	2,385		1,566
Commissions	2,352		2,900
Interest	1,594		1,720
Other	5,454		5,520
	$	65,599	$	80,224

5. INCOME TAXES

For the quarter and six months ended March 31, 2013 we recorded an income tax provision of $3.4 million and $6.3 million, respectively. For the quarter and six months ended April 1, 2012, we recorded an income tax provision of $4.7 million and $4.4 million, respectively. The difference in our effective rate from the U.S. statutory rate of 35 percentis primarily a result of income being taxed in foreign jurisdictions at a lower rate which is partially offset by jurisdictions where we have not provided benefit for the current period losses as they are not expected to be realized in the foreseeable future. Our effective tax rates for the quarter and six months ended March 31, 2013 varies significantly when compared to the same periods for the prior year primarily because of changes in the mix of income by jurisdiction and having a pre-tax income for the quarter and six months ended March 31, 2013 compared to pre-tax loss for quarter and six months ended April 1, 2012. The effective tax provision for each period was the combined calculated tax expenses/benefits for various jurisdictions.

We file U.S., state, and foreign income tax returns in jurisdictions with varying statutes of limitations. The 2007 through 2012 tax years generally remain subject to examination by federal tax authorities, most state tax authorities and in significant foreign jurisdictions. Each quarter, we reassess our uncertain tax positions for additional unrecognized tax benefits, interest and penalties, and deletions due to statute expirations. Based on federal, state and foreign statute expirations in various jurisdictions, we anticipate a decrease in the unrecognized tax benefits of approximately $13.9 million within the next twelve months.

We establish liabilities for possible assessments by tax authorities resulting from known tax exposures including, but not limited to, international tax issues and certain tax credits. The Internal Revenue Service (“IRS”) is currently examining the Company's income tax returns for fiscal years 2007 through 2009. As of March 31, 2013, the IRS has raised questions primarily related to transfer pricing. Management believes that the Company's position is appropriate and that an adequate provision has been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company's tax audits are resolved in a manner not consistent with management's expectations, the Company would be required to adjust its provision for income tax in the period such resolution occurs. While the Company believes its reported results are accurate, any significant adjustments could have a material adverse effect on the Company's results of operations, cash flows and financial position if not resolved within expectations.

6. CREDIT AGREEMENT AND RELATED INSTRUMENTS

Credit Agreement

We are a party to a senior secured credit facility with Morgan Stanley Senior Funding, Inc. ("MSSF") consisting of a term loan facility and a $50.0 million revolving credit facility. As of March 31, 2013, we had $726.0 million in term loan borrowings and no borrowings under the revolving credit facility. We can also request the establishment of one or more swingline loans and/or revolving credit facilities with commitments in an aggregate amount not to exceed $200.0 million.

10

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

During the quarter ended March 31, 2013, we entered into Amendment No. 4 to our Credit Agreement dated as of November 2, 2010 with MSSF and the lenders referred to therein (as amended, the “Credit Agreement”). The amendment extended the term loan maturity date, provided new pricing terms and modified certain financial covenant provisions such that they are not scheduled to be reported unless we have revolving or swingline loan balances outstanding at the end of a fiscal quarter. We accounted for the fourth amendment as a debt modification with respect to amounts that remained in the syndicate and a debt extinguishment with respect to the $277.5 million that exited the syndicate and recorded debt extinguishment expense of $3.0 million. The amendment did not impact the net principal balance outstanding.

Under the Credit Agreement, we may borrow under a "Base Rate" or "Eurodollar Rate". The “Base Rate” is defined as a rate per annum equal to the greatest of (a) the prime rate, (b) 1/2 of 1% per annum above the federal funds effective rate, (c) the one-month Eurodollar Rate plus 1%, and (d) in the case of any term loans, 2.00%. The “Eurodollar Rate” is defined as (a) the rate per annum offered for deposits of dollars for the applicable interest period that appears on Reuters Screen LIBOR01 Page as of 11:00 A.M., London, England time, two business days prior to the first day of such interest period or (b) if no such offered rate exists, such rate will be the rate of interest per annum as determined by the administrative agent (rounded upwards, if necessary, to the nearest 1/100 of 1%) at which deposits of dollars in immediately available funds are offered at 11:00 A.M., London, England time, two business days prior to the first day in the applicable interest period by major financial institutions reasonably satisfactory to the administrative agent in the London interbank market for such interest period and for an amount equal or comparable to the principal amount of the loans to be borrowed, converted or continued as Eurodollar Rate loans on such date of determination. In the case of term loans, the Eurodollar Rate will not be lower than 1.00%.

The applicable interest rate margin per annum for each type of loan at March 31, 2013 is as follows:

	Base Rate	Eurodollar Rate
Revolving and swingline loans	3.50%	4.50%
Term loans	1.75%	2.75%

As of March 31, 2013, term loan borrowings were under the Eurodollar Rate and subject to an interest rate of 3.75%. The fair value of our term loan balance was $731.4 million based on a market quote provided to us by MSSF.

The amended term loan facility matures in February 2020 and principal amortizes at $7.3 million per year. During the six months ended March 31, 2013, we completed optional principal prepayments of $50.0 million. Subsequent to March 31, 2013, we completed an additional optional principal prepayment of $27.0 million. While there are currently no scheduled principal repayments until the maturity date, the Credit Agreement stipulates an annual payment of a percentage of Excess Cash Flow ("ECF"). The ECF percentage is between 0% and 50% depending on our consolidated leverage ratio as of the end of a fiscal year.

We currently pay an undrawn commitment fee of 0.375% on the unused portion of the revolving facility. If any letters of credit are issued, then we expect to pay a fronting fee equal to 0.25% per annum of the aggregate face amount of each letter of credit and a participation fee on all outstanding letters of credit at a per annum rate equal to the margin then in effect with respect to Eurodollar Rate-based loans on the face amount of such letter of credit.

The Credit Agreement includes financial covenants requiring a maximum leverage ratio and minimum fixed charge coverage ratio that are applicable only when revolving loans or swingline loans are outstanding at the end of a fiscal quarter and also contains other customary affirmative and negative covenants and events of default. We were in compliance with our covenants as of March 31, 2013.

Interest Rate Swap Agreements

In connection with the original Credit Agreement, in 2011, we entered into interest rate swap agreements for the purpose of minimizing the variability of cash flows in the interest rate payments of our variable rate borrowings. The cash flows received under the interest rate swap agreements are expected to offset the change in cash flows associated with LIBOR rate borrowings between the effective and maturity dates of the swaps. Our two outstanding swap agreements have notional amounts, fixed rates and expiration dates as follows: $121.0 million at 1.83% expiring January 2014 and $24.0 million at 2.21% expiring January 2015. We classify our interest rate swap balances as Level 2 fair value measurements. We determined the fair value of our interest rate swap agreements based on mid-market valuations reported to us by the counterparty to the swap agreements. Related to these interest rate swap agreements, we recorded a current liability of $0.8 million and a long-term liability of $0.5 million as of March 31, 2013 and a long-term liability of $1.9 million as of September 30, 2012. We reflect the

11

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

change in fair value of the swaps through other income (expense), net and recorded income of $0.7 million in the first six months of 2013 and income of $0.2 million in the first six months of 2012.

7.    FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. Accounting Standards Codification ("ASC") 820 establishes a hierarchy for ranking the quality and reliability of the information used to determine fair values and includes the following classifications:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following financial assets and liabilities were measured at fair value on a recurring basis using the type of inputs shown:

	Fair Value Measurements Using:
	Total		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
September 30, 2012
Cash and cash equivalents	$	204,335	$	204,335	$	—	—
Pension plan assets	$	5,382	$	—	$	—	$	5,382
Interest rate swap liabilities	$	1,950	$	—	$	1,950	$	—
March 31, 2013
Cash and cash equivalents	$	206,921	$	206,921	$	—	$	—
Pension plan assets	$	5,480	$	—	$	—	$	5,480
Interest rate swap liabilities	$	1,283	$	—	$	1,283	$	—

Pension plan assets are insurance contracts with insurance payments guaranteed by the insurer and the security fund for insurance companies in Germany. There were no transfers of financial assets or liabilities between the classifications during the periods reported.

12

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

8. SEGMENT INFORMATION

We manage our business on the basis of one reportable segment, as a manufacturer of semiconductors in different geographic areas, including the United States, Europe and Asia. We derive revenue from sales of our high-performance analog/mixed-signal integrated circuits and power and high-reliability individual component semiconductors. These products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance, reliability and battery optimization, reducing size or protecting circuits. The principal markets that we serve include Communications, Defense & Security, Aerospace and Industrial. We evaluate sales by end-market based on our understanding of end market uses of our products.

Net sales by geographic area based on a customer's ship-to location and by estimated end market are as follows (amounts in thousands):

	Quarter Ended				Six Months Ended
	March 31, 2013		April 1, 2012		March 31, 2013		April 1, 2012
Net Sales:
United States	$	134,486	$	126,471	$	255,214	$	244,218
Europe	31,735		40,045		72,164		88,348
Asia	64,051		76,465		145,716		145,877
Other	5,061		6,325		9,837		11,783
Total	$	235,333	$	249,306	$	482,931	$	490,226
Communications	$	64,383	$	77,231	$	141,121	$	152,355
Defense & Security	79,445		71,466		155,067		140,581
Aerospace	44,185		52,879		92,409		102,002
Industrial	47,320		47,730		94,334		95,288
Total	$	235,333	$	249,306	$	482,931	$	490,226

As a percentage of consolidated net sales, customers with a ship-to location in Hong Kong totaled 10.8% and 11.4% for the quarter and six months ended April 1, 2012, respectively. We began reporting net sales by geographic area based on a customer's ship-to location in the second quarter of 2013 and prior year amounts have been adjusted to conform to current year presentation.     

Property and equipment, net by geographic area are as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
United States	$	94,282	$	93,496
Europe	13,254		13,253
Asia	8,768		7,912
Other	1,396		1,485
Total	$	117,700	$	116,146

9. STOCK-BASED COMPENSATION

Stock Based Compensation

In January 2012, our stockholders approved an amendment to the Microsemi Corporation 2008 Performance Incentive Plan (the “2008 Plan”). The amendment a) increased the share limit by an additional 14.5 million shares so that the amended aggregate share limit for the 2008 Plan is 28.5 million shares; b) extended the plan term to December 5, 2021; c) increased the number of shares counted against the share limit for every one share issued in connection with a full-value award to 2.41; d) terminated the evergreen provision in the original plan; and e) extended the Performance-Based Award feature through the first annual meeting of stockholders that occurs in calendar year 2017. Awards authorized by the 2008 Plan include options, stock

13

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

appreciation rights, restricted stock, stock bonuses, stock units, performance share awards, and other cash- or share-based awards. The shares issued under the 2008 Plan may be newly issued or shares held by the Company as treasury stock. The maximum term of a stock option grant or a stock appreciation right granted under the 2008 Plan is 6 years. For the quarter and six months ended March 31, 2013, stock-based compensation expense decreased operating income by $10.2 million and $18.3 million, respectively. For the quarter and six months ended April 1, 2012, stock-based compensation expense decreased operating income by $10.0 million and $17.6 million, respectively.

The quantity of restricted shares and performance stock units at target levels and their weighted-average fair value are as follows (quantity in thousands):

Six Months Ended	Quantity	Fair Value per Award
April 1, 2012
Restricted shares	1,522	$	19.30
Performance stock units	350	$	17.77
March 31, 2013
Restricted shares	1,802	$	20.24
Performance stock units	350	$	21.62

Restricted Shares

Compensation expense for restricted shares was calculated based on the closing price of our common stock on the date of grant and are subject to forfeiture if a participant does not meet length of service requirements. Restricted stock awards granted to employees typically vest over a three year period and awards granted to non-employee directors vest in accordance with our director compensation policy.

Performance Stock Units

Performance stock units granted in 2012 will vest based on the Company's growth in net sales and earnings per share (subject to certain adjustments) for 2012 and 2013 in comparison with the growth in net sales and adjusted earnings per share over the same period for a peer group selected by the Compensation Committee. For these performance stock units, 50% of each performance-based award opportunity will be subject to the net sales metric for the performance period and 50% will be subject to the earnings per share metric for the performance period.

Performance stock units granted in 2013 will vest based on the Company achieving net sales and earnings per share (subject to certain adjustments) levels for 2013, 2014 and 2015. For these performance stock units, 25% of each performance-based award opportunity will be subject to the net sales metric for the performance period and 75% will be subject to the earnings per share metric for the performance period.

Compensation expense is based upon either our estimate of performance relative to a peer group for the 2012 grant and our expected performance over the performance period for the 2013 grant. The maximum percentage for a particular metric is 200% of the “target” number of units subject to the award related to that metric. For performance stock units granted in 2013, the maximum percentage is further adjusted by the Company's total shareholder return relative to a peer group selected by the Compensation Committee, up to a maximum of 125%.

14

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

10. RESTRUCTURING CHARGES AND SEVERANCE CHARGES

In 2009, we approved consolidation plans that resulted in the closure of our manufacturing facility in Scottsdale, Arizona (“Scottsdale”), which ceased production during the quarter ended April 3, 2011. The Scottsdale facility occupied a 135,000 square foot leased facility. For Scottsdale, contract termination costs relate primarily to the remaining obligations under facility and equipment leases and are expected to be paid through 2016. The following table reflects the restructuring activities for the Scottsdale facility and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Total
Balance at September 30, 2012	$	117		$	5,848		$	5,965
Reversal of prior provision	(117		)	—			(117		)
Cash expenditures	—			(779		)	(779		)
Balance at March 31, 2013	$	—		$	5,069		$	5,069

At September 30, 2012, we had recorded severance and restructuring accruals of $2.3 million from reductions in force at our various facilities other than Scottsdale. We recorded additional provisions for severance totaling $7.2 million for the six months ended March 31, 2013. Provisions for severance in the six months ended March 31, 2013 covered approximately 120 individuals in manufacturing, engineering and sales. Employee severance is expected to be paid within the next twelve months. Contract termination costs relate primarily to remaining obligations under facility leases and are expected to be paid through 2020. Other associated costs related primarily to relocation costs that we incurred for the consolidation of several facilities in Northern California. The following table reflects the related restructuring activities and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Other Associated Costs			Total
Balance at September 30, 2012	$	2,124		$	190		$	—		$	2,314
Provisions	7,098			103			27			7,228
Cash expenditures	(5,146		)	(206		)	(27		)	(5,379		)
Other non-cash settlement	(201		)	(3		)	—			(204		)
Balance at March 31, 2013	$	3,875		$	84		$	—		$	3,959

11. COMMITMENTS AND CONTINGENCIES

In Broomfield, Colorado, the owner of a property located adjacent to a manufacturing facility owned by one of our subsidiaries, Microsemi Corp. – Colorado had notified the subsidiary and other parties of a claim that contaminants migrated to his property, thereby diminishing its value. In August 1995, the subsidiary, together with Coors Porcelain Company, FMC Corporation and Siemens Microelectronics, Inc. (former owners of the manufacturing facility), agreed to settle the claim and to indemnify the owner of the adjacent property for remediation costs. Although tricholorethylene and other contaminants previously used by former owners at the facility are present in soil and groundwater on the subsidiary’s property, we vigorously contest any assertion that the subsidiary caused the contamination. In November 1998, we signed an agreement with the three former owners of this facility whereby they have 1) reimbursed us for $0.5 million of past costs, 2) assumed responsibility for 90% of all future clean-up costs, and 3) promised to indemnify and protect us against any and all third-party claims relating to the contamination of the facility. An Integrated Corrective Action Plan was submitted to the State of Colorado. Sampling and management plans were prepared for the Colorado Department of Public Health & Environment. State and local agencies in Colorado are reviewing current data and considering study and cleanup options. The most recent forecast estimated that the total project cost, up to the year 2020, would be approximately $5.3 million; accordingly, we recorded a one-time charge of $0.5 million for this project in 2003. There has not been any significant development since 2003.

We are generally self-insured for losses and liabilities related to workers’ compensation and employer’s liability insurance. Accrued workers’ compensation liability was $1.5 million and $1.4 million at March 31, 2013 and September 30, 2012, respectively. Our self-insurance accruals are based on estimates and, while we believe that the amounts accrued are adequate, the ultimate claims may be in excess of the amounts provided.

15

MICROSEMI CORPORATION AND SUBSIDIARIES 

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

On December 8, 2010, Intellectual Ventures I LLC and Intellectual Ventures II LLC filed a complaint in the United States District Court for the District of Delaware against Altera Corporation, Microsemi, and Lattice Semiconductor Corporation. On February 15, 2011, the plaintiffs filed an amended complaint adding Xilinx, Inc. as a defendant. The complaint alleges, inter alia, that programmable logic devices manufactured and sold by our subsidiary Microsemi – SoC infringe United States Patent Numbers 5,687,325, 6,260,087 and 6,272,646 assigned to Intellectual Ventures II LLC, and seeks damages and other relief at law or in equity as the court deems appropriate. In January 2013, the parties settled this matter as it pertains to Microsemi and the action against us was dismissed by the court. The resolution of this matter did not have a material adverse effect on our financial position, results of operations or cash flows.

We are also involved in other pending litigation matters arising out of the normal conduct of our business, including litigation relating to acquisitions, employment matters, commercial transactions, contracts, environmental matters and matters related to compliance with governmental regulations. The ultimate aggregate amount of monetary liability or financial impact with respect to these matters is subject to many uncertainties and is therefore not predictable with assurance. In the opinion of management, the final outcome of these matters, if they are adverse, will not have a material adverse effect on our financial position, results of operations or cash flows. However, there can be no assurance with respect to such result, and monetary liability or financial impact on us from these litigation matters could differ materially from those projected.

16

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This Quarterly Report on Form 10-Q includes current beliefs, expectations and other forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from the results contemplated by these forward-looking statements due to certain factors, including those discussed in Part II, Item 1A, “Risk Factors” and elsewhere in this Quarterly Report. This “Management's Discussion and Analysis of Financial Condition and Results of Operations” (“MD&A”) and the accompanying consolidated financial statements and notes thereto must be read in conjunction with the MD&A and the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012, in its entirety.

OVERVIEW

We are a leading designer, manufacturer and marketer of high-performance analog and mixed-signal semiconductor solutions differentiated by power, security, reliability and performance. Our semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals. We offer one of the industry's most comprehensive portfolios of semiconductor technology. Our products include high-performance, high-reliability radio frequency (RF) and power components, analog and RF integrated circuits (ICs), standard and customizable system-on-chip solutions (SoCs/cSoCs), and mixed-signal and radiation-tolerant field programmable gate arrays (“FPGAs”). We also offer subsystems and modules that include application-specific power modules and Power-over-Ethernet (“PoE”) midspans.

Our products include individual components as well as IC solutions that enhance customer designs by improving performance, reliability and battery optimization, reducing size or protecting circuits. The principal end markets that we serve include Communications, Defense & Security, Aerospace and Industrial.

Power management generally refers to a class of standard linear integrated circuits (“SLICs”) that perform voltage regulation and reference in most electronic systems. The definition of power management has broadened in recent years to encompass other devices and modules, often application-specific standard products (“ASSPs”), which address particular aspects of power management, such as audio or display related ICs. This business is composed of both a core platform of traditional SLICs, such as low dropout regulators (“LDOs”) and pulse width modulators (“PWMs”), and differentiated ASSPs such as backlight inverters, audio amplification ICs and small computer standard interface terminators. Our IC products are used in data storage, wireless local area network (“LAN”), automobiles, telecommunications, test instruments, defense and aerospace equipment, high-quality sound reproduction and data transfer equipment.

Our individual component semiconductor products include silicon rectifiers, zener diodes, low leakage and high voltage diodes, temperature compensated zener diodes, transistors, subminiature high power transient suppressor diodes and pin diodes used in magnetic resonance imaging (“MRI”) machines. We also manufacture semiconductors for commercial applications, such as automatic surge protectors, transient suppressor diodes used for telephone applications and switching diodes used in computer systems. A partial list of these products includes: implantable cardioverter defibrillator and heart pacer switching, charging and transient shock protector diodes, low leakage diodes, transistors used in jet aircraft engines and high performance test equipment, high temperature diodes used in oil drilling sensing elements operating at 200 degrees centigrade, temperature compensated zener or rectifier diodes used in missile systems and power transistors.

We have implemented a growth strategy through continuous innovation complemented by strategic acquisitions to strengthen our product and technology portfolio with the intent of broadening our customer base and increasing our technology footprint in customers' end designs in high-value, high barrier-to-entry markets where power matters, security is non-negotiable, and reliability is vital. This allows us to offer an increased value proposition, gather a larger portion of the bill of materials, and engage with customers as a strategic partner as opposed to a socket provider. We believe this strategy strengthens our position in the industry as it protects and grows our share within those markets with the highest barriers to entry, and increases our served available market.

Recent industry leading innovations include:

• The industry's first monolithic line card device for optical transport network (OTN) transport and switching applications;

• High temperature NOR flash memory products tailored to meet the environmental demands of oil and gas industries' downhole drilling such as temperatures of 150°C and higher, while providing improved endurance benefits to systems designers;

• More than a dozen new devices in its new generation of 1200 volt (V) non-punch through (NPT) IGBTs which include 25A, 50A and 70A current ratings, and are designed for a wide range of industrial applications requiring high power and high performance such as arc welders, solar inverters, and uninterruptible and switch mode power supplies.

17

• A new family of U.S. Defense Logistics Agency (DLA)-qualified Schottky diodes for aerospace and defense applications requiring high density power and excellent heat dissipation (typically 0.2-0.8⁵ degrees C per watt (C/W);

• A new generation of industrial temperature, silicon carbide (SiC) standard power modules ideally suited for use in high power switch mode power supplies, motor drives, uninterruptible power supplies, solar inverters, oil exploration and other high power, high voltage industrial applications requiring high performance and reliability.

• A complete medical network (med-net) radio link for implantable medical devices such as pacemakers, cardiac defibrillators and neurostimulators that's comprised of the Company's ZL70321 implantable radio module and its ZL70120 base station radio module for external device controllers.

Our growth strategy is dependent on our ability to successfully develop new technologies and products, and complemented by our ability to implement our selective acquisitions strategy. New technologies or products that we may develop may not lead to an incremental increase in revenues, and there is a risk that these new technologies or products will decrease the demand for our existing products and result in an offsetting reduction in revenues. There can be no assurance that the benefits of any acquisition will outweigh the attendant costs, and if they do not, our results of operations and stock price may be adversely affected.

Net sales decreased$14.0 million or 6% between the quarters ended March 31, 2013 ("Q2 2013") and April 1, 2012 ("Q2 2012") to $235.3 million for Q2 2013 from $249.3 million for Q2 2012 and decreased$7.3 million or 1% between the six months ended March 31, 2013 ("2013 YTD") and April 1, 2012 ("2012 YTD") to $482.9 million for 2013 YTD from $490.2 million for 2012 YTD.

Gross profit increased$1.6 million to $133.5 million (56.7% of net sales) for Q2 2013 from $131.9 million (52.9% of net sales) for Q2 2012 and increased$18.4 million to $276.0 million (57.2% of net sales) in 2013 YTD from $257.6 million (52.5% of net sales) for 2012 YTD. For the six month periods, the increase in gross profit was primarily a result of contributions from the acquisition of Zarlink Semiconductor, Inc. ("Zarlink" or sometimes referred to herein as “Microsemi – CMPG"), which was completed during Q1 2012, margin improvements resulting from integration and cost improvement activities and acquisition-related inventory charges of $2.0 million in Q2 2012 and $8.1 million in 2012 YTD, which did not recur in 2013.

Uncertain macroeconomic conditions worldwide subject us to certain risks (see Part II, Item 1A, Risk Factors, “Negative or uncertain worldwide economic conditions may adversely affect our business, financial condition, cash flow and results of operations,” “The concentration of the facilities that service the semiconductor industry, including facilities of current or potential vendors or customers, makes us more susceptible to events or disasters affecting the areas in which they are most concentrated,” and “We may be unable to successfully implement our acquisitions strategy or integrate acquired companies and personnel with existing operations.”)

In response to the impact of flooding at subcontractor facilities in Thailand in the first quarter of fiscal year 2012, we implemented plans that moved production to other facilities outside the affected area. Current production capabilities at these other facilities have compensated for the loss of production in the flooded facilities in Thailand and we believe that we recovered from this event as of the end of the second quarter of 2012. However, unforeseen impacts on our customers, suppliers or subcontractors as a result of the flooding in Thailand, or other disasters, could continue to affect our revenue, consolidated financial position, results of operations and cash flows.

We closed our Scottsdale facility during the second quarter of 2011. We have current plans to and may make further specific determinations to consolidate, close, sell or divest additional facilities, operations or product lines, which could be announced at any time. Possible adverse consequences from current and future consolidation or disposition activities may include a loss of revenues and various accounting charges such as for workforce reduction, including severance and other termination benefits and for excess facilities, including lease termination fees, future contractual commitments to pay lease charges, facility remediation costs and moving costs to remove property and equipment from facilities. We may also be adversely impacted from inventory buildup in preparation for the transition of manufacturing, disposition costs, impairments of goodwill, a possible immediate loss of revenues, and other items in addition to normal or attendant risks and uncertainties. We may be unsuccessful in any of our current or future efforts to consolidate our business into a smaller number of facilities. Our plans to minimize or eliminate any loss of revenues during consolidation may not be achieved.

Markets

Our products include individual components as well as IC solutions that enhance customer designs by improving performance, reliability and battery optimization, reducing size or protecting circuits. The principal end markets that we serve include:

18

• Communications - Products in this end market include broadband power amplifiers and monolithic microwave integrated circuits (“MMICs”) targeted at 802.11 a/b/g/n/e, phase-locked loop, clock synthesis and distribution devices, Synchronous Ethernet (“SyncE”), packet timing devices, voice circuits, FPGAs, multiple-in multiple-out (“MIMO”), LED, cold cathode fluorescent lamp (“CCFL”) controllers, visible light sensors, PWM controllers, voltage regulators, EMI/RFI filters, transient voltage suppressors and class-D audio circuits. Applications for these products include wi-max and wireless LAN devices, PoE devices, portable devices, set top box and telecom applications, monitors, and storage devices.

• Defense & Security - Products in this end market include mixed-signal analog integrated circuits, JAN, JANTX, JANTXV and JANS high-reliability semiconductors, as well as modules including diodes, zeners, diode arrays, transient voltage suppressors, bipolar transistors, MOSFETs, IGBTs, small signal analog integrated circuits, small signal transistors, relays, silicon-controlled rectifiers (“SCRs”), RF transceivers, subsystems and FPGAs. These products are utilized in a variety of applications including radar and communications, defense electronics, homeland security, threat detection, targeting and fire control and other power conversion and related systems in military platforms.

• Aerospace - Products in this end market include offerings such as JAN, JANTX, JANTXV and JANS high-reliability semiconductors and modules, as well as analog mixed-signal products including diodes, zeners, diode arrays, transient voltage suppressors, bipolar transistors, small signal analog integrated circuits, relays, small signal transistors, SCRs, MOSFETs, IGBTs and FPGAs. These products are utilized in a variety of applications including electronic applications for large aircraft and regional jets, commercial radar and communications, satellites, cockpit electronics, and other power conversion and related systems in space and aerospace platforms.

• Industrial - Products in this end market include MOSFETs, IGBTs, FPGAs, power modules, ultra-thin bypass diodes, bridge rectifiers, and high-voltage assemblies for use in industrial equipment, semiconductor capital equipment and solar power applications. Industrial applications also include zener diodes, high-voltage diodes, MOSFETs, IGBTs, transient voltage suppressors and thyristor surge protection devices that are designed into implantable defibrillators, pacemakers and neurostimulators, as well as PIN diode switches, dual diode modules, switched-most power supplies (“SMPS”) and RF gradient amplifiers for use in MRI systems.

Restructuring and Severance Charges

In 2009, we approved consolidation plans that resulted in the closure of our manufacturing facility in Scottsdale, Arizona (“Scottsdale”), which ceased production during the quarter ended April 3, 2011. The Scottsdale facility occupied a 135,000 square foot leased facility. For Scottsdale, contract termination costs relate primarily to remaining obligations under facility and equipment leases and are expected to be paid through 2016. The following table reflects the restructuring activities for the Scottsdale facility and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Total
Balance at September 30, 2012	$	117		$	5,848		$	5,965
Reversal of prior provision	(117		)	—			(117		)
Cash expenditures	—			(779		)	(779		)
Balance at March 31, 2013	$	—		$	5,069		$	5,069

At September 30, 2012, we had recorded severance and restructuring accruals of $2.3 million from reductions in force at our various facilities other than Scottsdale. We recorded additional provisions for severance and retention payments totaling $7.2 million for the six months ended March 31, 2013. Provisions for severance in the six months ended March 31, 2013 covered approximately 120 individuals in manufacturing, engineering and sales. Employee severance is expected to be paid within the next twelve months. Contract termination costs relate primarily to remaining obligations under facility leases and are expected to be paid through 2020. Other associated costs related primarily to relocation costs that we incurred for the consolidation of several facilities in Northern California. The following table reflects the related restructuring activities and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

19

	Employee Severance			Contract Termination Costs			Other Associated Costs			Total
Balance at September 30, 2012	$	2,124		$	190		$	—		$	2,314
Provisions	7,098			103			27			7,228
Cash expenditures	(5,146		)	(206		)	(27		)	(5,379		)
Other non-cash settlement	(201		)	(3		)	—			(204		)
Balance at March 31, 2013	$	3,875		$	84		$	—		$	3,959

RESULTS OF OPERATIONS

Net sales decreased$14.0 million or 6% between the quarters ended March 31, 2013 ("Q2 2013") and April 1, 2012 ("Q2 2012") to $235.3 million for Q2 2013 from $249.3 million for Q2 2012 and decreased$7.3 million or 1% between the six months ended March 31, 2013 ("2013 YTD") and April 1, 2012 ("2012 YTD") to $482.9 million for 2013 YTD from $490.2 million for 2012 YTD.

Estimated sales by end markets are based on our understanding of end market uses of our products. An estimated breakout of net sales by end markets is approximately as follows (amounts in thousands):

	Quarter Ended				Six Months Ended
	March 31, 2013		April 1, 2012		March 31, 2013		April 1, 2012
Communications	$	64,383	$	77,231	$	141,121	$	152,355
Defense & Security	79,445		71,466		155,067		140,581
Aerospace	44,185		52,879		92,409		102,002
Industrial	47,320		47,730		94,334		95,288
Total	$	235,333	$	249,306	$	482,931	$	490,226

Net sales in the Communications end market decreased$12.8 million to $64.4 million in Q2 2013 from $77.2 million in Q2 2012 and decreased$11.2 million to $141.1 million in 2013 YTD from $152.4 million in 2012 YTD. While this end market benefited from increased contributions of voice circuit and timing and synchronization products, our overall Communications end market is sensitive to macroeconomic conditions and capital expenditure deployment, which resulted in a decline in net sales. During Q2 2013, PoE, power management, RF and voice circuit products were especially impacted by macroeconomic factors. We expect to continue expanding our market opportunity in timing and synchronization products and believe we are well poised for growth based on our expectation of telecommunications carrier spend on these products. Though macroeconomic conditions are expected to temper growth, we expect that net sales in this end market are expected to increase in the upcoming quarter due to seasonality, market share gains and market expansion in PoE products and increased capacity in RF products, with continued steady growth from our timing and synchronization products.

Net sales in the Defense & Security end market increased$8.0 million to $79.4 million in Q2 2013 from $71.5 million in Q2 2012 and increased$14.5 million to $155.1 million in 2013 YTD from $140.6 million in 2012 YTD. Sales for Q2 2012 and 2012 YTD were adversely impacted by the lack of a 2012 federal budget through Q1 2012 and uncertainty surrounding the defense budget was reflected in cautious procurement plans of our customers. While the uncertainty of sequestration remains, this end market has grown steadily over the last year. We believe the most recent budget emphasizes command, control, communications, computers, intelligence, surveillance and reconnaissance and equates to growing electronic content. We also believe that net sales benefited from increasing international defense sales, enabled in part by our security product offerings, and that Microsemi's dollar content in defense programs will increase as our products move up the value chain. We believe the Department of Defense and Homeland Security budgets for electronic content, an area of Microsemi focus, will continue to expand and contribute to growth in this end market. We believe that net sales have benefited from our industry leading technology breadth and total solutions approach and as a result, we are currently bidding for more potential dollar value than any time in our past. We recognize that the current uncertainty surrounding the U.S. federal budget and sequestration may result in short-term delays in defense programs but believe in our long term growth prospects for this end market.

Net sales in the Aerospace end market decreased$8.7 million to $44.2 million in Q2 2013 from $52.9 million in Q2 2012 and decreased$9.6 million to $92.4 million in 2013 YTD from $102.0 million in 2012 YTD. We noted an increase in demand and order rates for commercial aircraft at aircraft manufacturers and tier one suppliers, growing electronic content in current aircraft, refurbishment programs for older aircraft and demand for the high-reliability radar and avionics solutions we provide. During Q2 2013, however, sales of space level products were adversely impacted by longer lead times affecting the timing of sales. Space level bookings have increased and we expect increased shipments of space level products along with steady commercial aerospace sales.

20

Net sales in the Industrial end market decreased$0.4 million to $47.3 million in Q2 2013 from $47.7 million in Q2 2012 and decreased$1.0 million to $94.3 million in 2013 YTD from $95.3 million in 2012 YTD. With the exception of solar products, bookings were steady for medical, semicapital equipment, industrial lasers, MRI and other broadline industrial applications. Over the intermediate to longer term, we believe that our differentiated medical products and early design-in activity in industrial automation applications will result in growth for this end market.

Net sales by geographic area based on a customer's ship-to location were as follows (amounts in thousands):

	Quarter Ended				Six Months Ended
	March 31, 2013		April 1, 2012		March 31, 2013		April 1, 2012
United States	$	134,486	$	126,471	$	255,214	$	244,218
Europe	31,735		40,045		72,164		88,348
Asia	64,051		76,465		145,716		145,877
Other	5,061		6,325		9,837		11,783
Total	$	235,333	$	249,306	$	482,931	$	490,226

As a percentage of consolidated net sales, customers with a ship-to location in Hong Kong totaled 10.8% and 11.4% for the quarter and six months ended April 1, 2012, respectively. We began reporting net sales by geographic area based on a customer's ship-to location in Q2 2013 and prior year amounts have been adjusted to conform to current year presentation.    

Gross profit increased$1.6 million to $133.5 million (56.7% of net sales) for Q2 2013 from $131.9 million (52.9% of net sales) for Q2 2012 and increased$18.4 million to $276.0 million (57.2% of net sales) in 2013 YTD from $257.6 million (52.5% of net sales) in 2012 YTD. For the six month periods, the increase in gross profit was primarily a result of contributions from Microsemi – CMPG, which was completed during Q1 2012, margin improvements resulting from integration and cost improvement activities and acquisition-related inventory charges of $2.0 million in Q2 2012 and $8.1 million in 2012 YTD, which did not recur in 2013.

Selling, general and administrative ("SG&A") expenses increased$0.3 million to $52.3 million for Q2 2013 from $52.0 million in Q2 2012 and decreased$3.0 million to $103.7 million in 2013 YTD from $106.7 million in 2012 YTD. Research and development expense decreased$0.2 million to $42.0 million for Q2 2013 from $42.2 million for Q2 2012 and increased$3.3 million to $85.1 million in 2013 YTD from $81.8 million in 2012 YTD. While incremental costs from recent acquisitions contributed to increased SG&A and research and development expenses, increases were offset by cost control measures, especially in SG&A.

The principal focus of our research and development activities has been to improve processes and to develop new products that support the growth of our businesses. The spending on research and development was principally to develop new higher-margin application-specific products, including, among others, our 65nm process development for next generation programmable products, higher power PoE solutions, the continued roadmap development of our industry-leading timing & synchronization products, our SiGe RF power amplifier solutions for wireless LAN applications, and the ongoing development of GaN and SiC power management and RF solutions.

Amortization of intangible assets decreased$5.4 million to $21.1 million for Q2 2013 from $26.5 million for Q2 2012 and decreased$8.5 million to $42.8 million in 2013 YTD from $51.3 million in 2012 YTD. The decrease was primarily from the amortization of backlog related to Microsemi - CMPG that had an amortizable life of one year. These amounts include amortization related to acquired completed technology of $19.5 million for 2013 YTD and $20.6 million for 2012 YTD.

Restructuring charges amounted to $6.3 million for Q2 2013 compared to $0.1 million for Q2 2012 and $7.1 million for 2013 YTD compared to $7.3 million for 2012 YTD. The variances relate to the timing and announcement of restructuring activities.

Interest expense, net was $7.7 million for Q2 2013 compared to $10.2 million for Q2 2012 and $16.1 million for 2013 YTD compared to $22.0 million for 2012 YTD. The decrease in interest expense was due to a lower term loan balance of $726.0 million at March 31, 2013 compared to $808.0 million at April 1, 2012 and a reduction in interest rate to 3.75% during Q2 2013 compared to 4.00% during Q2 2012.

Other expense, net, was $3.6 million for Q2 2013 compared to $1.0 million for Q2 2012 and $3.5 million for 2013 YTD compared to $33.4 million for 2012 YTD. During Q2 2013, we entered into Amendment No. 4 to our Credit Agreement dated as of November 2, 2010 with MSSF and the lenders referred to therein (as amended, the “Credit Agreement”), which among other things, reduce the interest rate on our term loan to 3.75%. We accounted for the fourth amendment as a debt modification with respect to amounts that remained in the syndicate and a debt extinguishment with respect to the $277.5 million that exited the syndicate and recorded debt extinguishment expense of $3.0 million. The amendment did not impact the net principal balance outstanding.

21

In connection with the original Credit Agreement, in 2011, we entered into interest rate swap agreements for the purpose of minimizing the variability of cash flows in the interest rate payments of our variable rate borrowings. In connection with the acquisition of Zarlink, we entered into a foreign currency forward agreement in the Q4 2011 to minimize our foreign currency risk associated with the transaction that we funded in Canadian Dollars. We reflect the change in fair value of our term loan balances, swaps and forward contract through other income or expense. We recorded income of $5.1 million in Q1 2012 related to these adjustments. During the Q1 2012, we amended our credit facility and accounted for the amendment as a debt extinguishment. Accordingly, we recorded $34.0 million in debt extinguishment costs in other income (expense). During the Q2 2012, we further amended our credit facility and accounted for this amendment as a debt modification with respect to amounts that remained in the syndicate and a debt extinguishment with respect to amounts that exited the syndicate. As such, we immediately expensed $1.2 million in financing costs related to the debt extinguishment. Subsequent to the amendment in the first quarter of 2012, we did not elect the fair value option on our outstanding term loan balances.

For Q2 2013 and 2013 YTD, we recorded an income tax provision of $3.4 million and $6.3 million, respectively. For Q2 2012 and 2012 YTD, we recorded an income tax provision of $4.7 million and $4.4 million, respectively. The difference in our effective rate from the U.S. statutory rate of 35 percentis primarily a result of income being taxed in foreign jurisdictions at a lower rate which is partially offset by jurisdictions where we have not provided benefit for the current period losses as they are not expected to be realized in the foreseeable future. Our effective tax rates for Q2 2013 and 2013 YTD varies significantly when compared to the same periods for the prior year primarily because of changes in the mix of income by jurisdiction and having a pre-tax income for the Q2 2013 and 2013 YTD compared to pre-tax loss for Q2 2012 and 2012 YTD. The effective tax provision for each period was the combined calculated tax expenses/benefits for various jurisdictions.

CAPITAL RESOURCES AND LIQUIDITY

We had $206.9 million and $204.3 million in cash and cash equivalents at March 31, 2013 and September 30, 2012, respectively. During 2013 YTD and 2012 YTD, we financed our operations with cash generated from operations. A significant portion of our cash and cash equivalents are domiciled in the United States and we believe that we will be able to meet our future capital and liquidity requirements without significant tax consequences.

Net cash provided by operating activities decreased$1.2 million to $60.0 million for 2013 YTD from $61.3 million for 2012 YTD. A summary of net cash provided by operating activities for 2013 YTD and 2012 YTD is as follows (amounts in thousands):

	Six Months Ended
	2013			2012
Net income (loss)	$	11,309		$	(49,394	)
Depreciation and amortization	57,385			68,302
Provision for doubtful accounts	(148		)	(284		)
Amortization of deferred financing cost	596			1,528
Settlement of foreign currency forward	—			(3,701		)
Loss on disposition or impairment of assets	—			1,513
Deferred income taxes	2,347			(997		)
Stock-based compensation	18,278			17,577
Net change in working capital accounts	(29,194		)	11,087
Net change in other long term assets and liabilities	(524		)	15,663
Net cash provided by operating activities	$	60,049		$	61,294

Accounts receivable increased$5.2 million to $158.4 million at March 31, 2013 from $153.2 million at September 30, 2012. The increase in accounts receivable was primarily due to the timing of sales towards the end of 2013 YTD. Inventories increased$3.7 million to $162.7 million at March 31, 2013 from $159.1 million at September 30, 2012, with the increase primarily due to the anticipation of sales growth in the third quarter of 2013.

Current liabilities decreased$19.6 million to $136.9 million at March 31, 2013 from $156.5 million at September 30, 2012. The decrease was due primarily to the payments of accrued bonus and profit sharing.

Net cash used in investing activities was $17.6 million for 2013 YTD compared to $606.9 million for 2012 YTD. Net cash used in investing activities for 2013 YTD was for purchases of property and equipment. Net cash used in investing activities in 2012 YTD consisted of net cash consideration of $540.2 million and $44.0 million, respectively, for the acquisitions of Microsemi – CMPG and the timing, synchronization and synthesis business of Maxim Integrated Products, Inc., $26.7 million in purchases of property and equipment offset by $3.7 million for the settlement of foreign currency forward and $0.3 million in insurance proceeds. 

22

Net cash (used in) provided by financing activities was $(39.9) million for 2013 YTD compared to $400.3 million for 2012 YTD. Net cash used in financing activities in 2013 YTD consisted of principal repayments of $50.0 million under our credit agreement and $0.6 million in credit facility refinancing costs, offset by $10.7 million in net proceeds from the exercise of stock awards. Net cash provided by financing activities in 2012 YTD primarily consisted of net borrowings of $435.8 million under our credit agreement and $6.3 million in net proceeds from stock awards, offset by $41.8 million in credit facility issuance and refinancing costs.

During the quarter ended March 31, 2013, we entered into Amendment No. 4 to our Credit Agreement . The amendment extended the term loan maturity date, provided new pricing terms and modified certain financial covenant provisions. We accounted for the fourth amendment as a debt modification with respect to amounts that remained in the syndicate and a debt extinguishment with respect to amounts that exited the syndicate and recorded debt extinguishment expense of $3.0 million. The amendment did not impact the net principal balance outstanding.

Under the Credit Agreement, we may borrow under a "Base Rate" or "Eurodollar Rate". The “Base Rate” is defined as a rate per annum equal to the greatest of (a) the prime rate, (b) 1/2 of 1% per annum above the federal funds effective rate, (c) the one-month Eurodollar Rate plus 1%, and (d) in the case of any term loans, 2.00%. The “Eurodollar Rate” is defined as (a) the rate per annum offered for deposits of dollars for the applicable interest period that appears on Reuters Screen LIBOR01 Page as of 11:00 A.M., London, England time, two business days prior to the first day of such interest period or (b) if no such offered rate exists, such rate will be the rate of interest per annum as determined by the administrative agent (rounded upwards, if necessary, to the nearest 1/100 of 1%) at which deposits of dollars in immediately available funds are offered at 11:00 A.M., London, England time, two business days prior to the first day in the applicable interest period by major financial institutions reasonably satisfactory to the administrative agent in the London interbank market for such interest period and for an amount equal or comparable to the principal amount of the loans to be borrowed, converted or continued as Eurodollar Rate loans on such date of determination. In the case of term loans, the Eurodollar Rate will not be lower than 1.00%.

The applicable interest rate margin per annum for each type of loan at March 31, 2013 is as follows:

	Base Rate	Eurodollar Rate
Revolving Loans and Swingline Loans	3.50%	4.50%
Term Loans	1.75%	2.75%

As of March 31, 2013, term loan borrowings were under the Eurodollar Rate and subject to an interest rate of 3.75%. The fair value of our term loan balance was $731.4 million based on a market quote provided to us by MSSF and we classify this valuation as a Level 2 fair value measurement.

The amended term loan facility matures in February 2020 and principal amortizes at $7.3 million per year. During the six months ended March 31, 2013, we completed optional principal prepayments of $50.0 million. Subsequent to March 31, 2013, we completed an additional optional principal prepayment of $27.0 million. While there are currently no scheduled principal repayments until the maturity date, the Credit Agreement stipulates an annual payment of a percentage of Excess Cash Flow ("ECF"). The ECF percentage is between 0% and 50% depending on our consolidated leverage ratio as of the end of a fiscal year.

We currently pay an undrawn commitment fee of 0.375% on the unused portion of the revolving facility. If any letters of credit are issued, then we expect to pay a fronting fee equal to 0.25% per annum of the aggregate face amount of each letter of credit and a participation fee on all outstanding letters of credit at a per annum rate equal to the margin then in effect with respect to Eurodollar Rate-based loans on the face amount of such letter of credit.

The Credit Agreement includes financial covenants requiring a maximum leverage ratio and minimum fixed charge coverage ratio that are applicable only when revolving loans or swingline loans are outstanding at the end of a fiscal quarter and also contains other customary affirmative and negative covenants and events of default. We were in compliance with our financial covenants as of March 31, 2013.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States that require us to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited consolidated financial statements and revenues and expenses during the periods reported. Actual results could differ from those estimates. Information with respect to our critical accounting policies that we believe could have the most significant effect on our reported results and require subjective or complex judgments is contained in Note 1 of the notes to the financial statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

23

RECENTLY ISSUED ACCOUNTING STANDARDS

In December 2011, the FASB issued ASU No. 2011-11, the objective of which is to provide additional disclosures on the effect or potential effect of rights of setoff associated with an entity's recognized assets and recognized liabilities within the scope of the update. The update primarily impacts financial instruments and derivatives subject to a master netting arrangement or similar agreement. ASU No. 2011-11 is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods (the first quarter of our fiscal year 2014). We are currently assessing the disclosures required under this ASU.

In February 2013, the FASB issued ASU No. 2013-04, the objective of which is to provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The guidance in the update requires that these arrangements be recorded as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors. ASU 2013-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. We are currently assessing the impact of this ASU on our consolidated financial position and results of operations.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is the potential loss arising from adverse changes in credit risk, foreign currency exchange rates, interest rates or the stock market. We are exposed to various market risks, which are related to credit risks, changes in certain foreign currency exchange rates and changes in certain interest rates.

We conduct a relatively small portion of our business in a number of foreign currencies, principally the European Union Euro, Canadian Dollar, British Pound, Israeli Shekel and Chinese RMB. We may receive some revenues in foreign currencies and purchase some inventory and services in foreign currencies. Accordingly, we are exposed to transaction gains and losses that could result from changes in exchange rates of foreign currencies relative to the U.S. dollar. Transactions in foreign currencies have represented a relatively small portion of our business. As a result, foreign currency fluctuations have not had a material impact historically on our revenues or results of operations. However, there can be no assurance that future fluctuations in the value of foreign currencies will not have material adverse effects on our results of operations, cash flows or financial condition. Specific to the acquisition of Zarlink, we entered into a foreign currency forward agreement in the fourth quarter of 2011 to minimize our foreign currency risk associated with the transaction that we funded in CAD. We agreed to purchase CAD 623.0 million for $608.2 million that settled in the first quarter of 2012. Other than the foregoing, we have not conducted a foreign currency hedging program thus far. We have considered and may continue to consider the adoption of a foreign currency hedging program.

We are potentially subject to concentrations of credit risk consisting principally of trade accounts receivable. Concentrations of credit risks exist because we rely on a significant portion of customers whose principal sales are to the U.S. Government or to subcontractors whose material sales are to the U.S. Government. We, as a subcontractor, sell our products to higher-tier subcontractors or to prime contractors based upon purchase orders that usually do not contain all of the conditions included in the prime contract with the U.S. Government. However these sales are usually subject to termination and/or price renegotiations by virtue of their reference to a U.S. Government prime contract. Therefore, we believe that all of our product sales that ultimately are sold to the U.S. Government may be subject to termination, at the convenience of the U.S. Government or to price renegotiations under the Renegotiation Act. We have never experienced a material loss due to termination of a U.S Government contract. We have never had to renegotiate our price under any government contract.

Under the Credit Agreement, we may borrow under a "Base Rate" or "Eurodollar Rate". The “Base Rate” is defined as a rate per annum equal to the greatest of (a) the prime rate, (b) 1/2 of 1% per annum above the federal funds effective rate, (c) the one-month Eurodollar Rate plus 1%, and (d) in the case of any term loans, 2.00%. The “Eurodollar Rate” is defined as (a) the rate per annum offered for deposits of dollars for the applicable interest period that appears on Reuters Screen LIBOR01 Page as of 11:00 A.M., London, England time, two business days prior to the first day of such interest period or (b) if no such offered rate exists, such rate will be the rate of interest per annum as determined by the administrative agent (rounded upwards, if necessary, to the nearest 1/100 of 1%) at which deposits of dollars in immediately available funds are offered at 11:00 A.M., London, England time, two business days prior to the first day in the applicable interest period by major financial institutions reasonably satisfactory to the administrative agent in the London interbank market for such interest period and for an amount equal or comparable to the principal amount of the loans to be borrowed, converted or continued as Eurodollar Rate loans on such date of determination. In the case of term loans, the Eurodollar Rate will not be lower than 1.00%.

24

The applicable interest rate margin per annum for each type of loan at March 31, 2013 is as follows:

	Base Rate	Eurodollar Rate
Revolving and swingline loans	3.50%	4.50%
Term loans	1.75%	2.75%

Our amended term loan facility matures in February 2020 and principal amortizes at $7.3 million per year. During the six months ended March 31, 2013, we completed an optional principal prepayment of $50.0 million. Subsequent to the end of the quarter, we completed an additional optional principal prepayment of $27.0 million resulting in a current term loan balance of $699.0 million. A 1.00% change in interest rates would result in an annual change of $7.0 million in interest expense. While there are currently no scheduled principal repayments until the maturity date, our credit agreement stipulates an annual payment of a percentage of Excess Cash Flow ("ECF"). The ECF percentage is between 0% and 50% depending on our consolidated leverage ratio as of the end of a fiscal year.

In connection with the original Credit Agreement, in 2011, we entered into interest rate swap agreements for the purpose of minimizing the variability of cash flows in the interest rate payments of our variable rate borrowings. The cash flows received under the interest rate swap agreements are expected to offset the change in cash flows associated with LIBOR rate borrowings between the effective and maturity dates of the swaps. Our two outstanding swap agreements have notional amounts, fixed rates and expiration dates as follows: $121.0 million at 1.83% expiring January 2014 and $24.0 million at 2.21% expiring January 2015. We classify our interest rate swap balances as Level 2 fair value measurements. We determined the fair value of our interest rate swap agreements based on mid-market valuations reported to us by the counterparty to the swap agreements. Related to these interest rate swap agreements, we recorded a current liability of $0.8 million and a long-term liability of $0.5 million as of March 31, 2013 and a long-term liability of $1.9 million as of September 30, 2012. We reflect the change in fair value of the swaps through other income (expense), net and recorded income of $0.7 million in the first six months of 2013 and income of $0.2 million in the first six months of 2012.

ITEM 4. CONTROLS AND PROCEDURES

(a) Evaluation of disclosure controls and procedures.

Our Chief Executive Officer and Chief Financial Officer, with the assistance of other members of management, conducted an evaluation of our disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended) as of the end of the period covered by this Quarterly Report. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of March 31, 2013.

(b) Changes in internal control over financial reporting.

There have been no changes in the Company’s internal control over financial reporting during the fiscal quarter ended March 31, 2013 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

On December 8, 2010, Intellectual Ventures I LLC and Intellectual Ventures II LLC filed a complaint in the United States District Court for the District of Delaware against Altera Corporation, Microsemi, and Lattice Semiconductor Corporation. On February 15, 2011, the plaintiffs filed an amended complaint adding Xilinx, Inc. as a defendant. The complaint alleges, inter alia, that programmable logic devices manufactured and sold by our subsidiary Microsemi – SoC infringe United States Patent Numbers 5,687,325, 6,260,087 and 6,272,646 assigned to Intellectual Ventures II LLC, and seeks damages and other relief at law or in equity as the court deems appropriate. In January 2013, the parties settled this matter as it pertains to Microsemi and the action against us was dismissed by the court. The resolution of this matter did not have a material adverse effect on our financial position, results of operations or cash flows.

We are also involved in other pending litigation matters arising out of the normal conduct of our business, including litigation relating to acquisitions, employment matters, commercial transactions, contracts, environmental matters and matters related to compliance with governmental regulations. The ultimate aggregate amount of monetary liability or financial impact with respect to these matters is subject to many uncertainties and is therefore not predictable with assurance. In the opinion of management, the final outcome of these matters, if they are adverse, will not have a material adverse effect on our financial

25

position, results of operations or cash flows. However, there can be no assurance with respect to such result, and monetary liability or financial impact on us from these litigation matters could differ materially from those projected.

ITEM 1A. RISK FACTORS

While there have been no material updates to the risk factors set forth below that constitute material changes from the risk factors previously disclosed in our Annual Report on Form 10-K as filed with the SEC on November 21, 2012, we routinely update our risk factors and for the convenience of our readers, our updated risk factors are included below in this Item 1A, and we recommend that they be read in their entirety.

Negative or uncertain worldwide economic conditions could prevent us from accurately forecasting demand for our products, which could adversely affect our operating results or market share.

Recent negative worldwide economic conditions and market instability have made it increasingly difficult for us, our customers and our suppliers to accurately forecast future product demand trends. If signs of improvement in the global economy do not progress as expected and global economic conditions worsen, our forecasts of product demand trends could prove to be incorrect and could cause us to produce excess products that can depress product prices, increase our inventory carrying costs and result in obsolete inventory. Alternatively, this forecasting difficulty could cause a shortage of products, or materials used in our products, that could result in an inability to satisfy demand for our products and a loss of market share.

Negative or uncertain worldwide economic conditions may adversely affect our business, financial condition, cash flow and results of operations.

Recent domestic and global economic conditions have presented unprecedented and challenging conditions reflecting continued concerns about the availability and cost of credit, downgrades and continued negative pressure on sovereign credit ratings, the mortgage market, declining real estate values, increased energy costs, decreased consumer confidence and spending and added concerns fueled by the federal government's interventions in the financial and credit markets. These conditions have contributed to instability in both the domestic and international capital and credit markets, potentially increased the cost of credit and diminished expectations for the global economy. In addition, these conditions make it extremely difficult for our customers to accurately forecast and plan future business activities and could cause businesses to slow spending on our products, which could cause our sales to decrease or result in an extension of our sales cycles. Due to these conditions, our customers may have difficulties obtaining capital at adequate or historical levels to finance their ongoing businesses and operations, which could impair their ability to make timely payments to us. If that were to occur, we may be required to increase our allowance for doubtful accounts and our days sales outstanding would be negatively impacted. We cannot predict the timing, strength or duration of any economic slowdown or subsequent economic recovery, worldwide or within our industry. If signs of improvement in the global economy do not progress as expected and economic conditions worsen, our business, financial condition, cash flows and results of operations will be adversely affected.

We may be unable to successfully implement our acquisitions strategy or integrate acquired companies and personnel with existing operations.

We have in the past acquired a number of businesses or companies, additional product lines and assets, and we may continue to expand and diversify our operations with additional acquisitions. We may be unable to identify or complete prospective acquisitions for many reasons, including competition from other companies in the semiconductor industry and high valuations of business candidates. In addition, applicable antitrust laws and other regulations may limit our ability to acquire targets or force us to divest an acquired business, such as occurred with our attempt to acquire SEMICOA. If we are unable to identify suitable targets or complete acquisitions, our growth prospects may suffer, and we may not be able to realize sufficient scale advantages to compete effectively in all markets. To the extent that we are successful in making acquisitions, if we are unsuccessful in integrating acquired companies or product lines with existing operations, or if integration is more difficult or more costly than anticipated, we may experience disruptions that could have a material adverse effect on our business, financial condition and results of operations. In addition, the market price of our common stock could be adversely affected if the effect of any acquisitions on the Microsemi consolidated group's financial results is dilutive or is below the market's or financial analysts' expectations. Some of the risks that may affect our ability to integrate or realize any anticipated benefits from acquired companies, businesses or assets include those associated with:

• unexpected losses of key employees or customers of the acquired company;

• conforming the acquired company's standards, processes, procedures and controls with our operations;

• coordinating new product and process development;

• increasing complexity from combining recent acquisitions;

• hiring additional management and other critical personnel;

26

• increasing the scope, geographic diversity and complexity of our operations;

• difficulties in consolidating facilities and transferring processes and know-how;

• other difficulties in the assimilation of acquired operations, technologies or products;

• diversion of management's attention from other business concerns; and

• adverse effects on existing business relationships with customers.

In connection with acquisitions, we may:

• use a significant portion of our available cash; 

• issue equity securities, which would dilute current stockholders' percentage ownership;

• incur substantial debt;  

• incur or assume contingent liabilities, known or unknown, including potential lawsuits, infringement actions and similar liabilities;  

• incur impairment charges related to goodwill or other intangibles;  

• incur large, immediate accounting write-offs; and  

• face antitrust or other regulatory inquiries or actions.

There can be no assurance that the benefits of any acquisitions will outweigh the attendant costs, and if they do not, our results of operations and stock price may be adversely affected.

The concentration of the facilities that service the semiconductor industry, including facilities of current or potential vendors or customers, makes us more susceptible to events or disasters affecting the areas in which they are most concentrated.

Relevant portions of the semiconductor industry, and the facilities that serve or supply this industry, tend to be concentrated in certain areas of the world. Events such as natural disasters and related disruptions, epidemics and health advisories like those related to Sudden Acute Respiratory Syndrome, Avian Influenza or the H1N1 Virus, flooding, tsunamis, power outages and infrastructure disruptions, and terrorism, civil unrest and political instability in those areas, have from time to time in the past, and may again in the future, adversely affect the semiconductor industry. In particular, events such as these could adversely impact our ability to manufacture or deliver our products and result in increased costs and a loss of revenue. Similarly, a localized risk affecting our employees or the staff of our suppliers could impair the total volume of products that we are able to manufacture, which could adversely affect our results of operations and financial condition.

In the first quarter of fiscal year 2012, severe flooding in certain regions of Thailand forced a shutdown of our operations in two subcontracted facilities in Thailand. The two Thailand facilities together accounted for as much as 5% of our total quarterly revenues. In response to the impact of flooding at subcontractor facilities in Thailand, we implemented plans to move production to other facilities outside the affected area. Current production capabilities at these other facilities have compensated for the loss of production in the flooded facilities in Thailand and we believe that we recovered from this event as of the end of the second quarter of 2012. However, unforeseen impacts on our customers, suppliers or subcontractors as a result of the flooding in Thailand, or other natural disasters, could continue to affect our revenue, consolidated financial position, results of operations and cash flows.

We are dependent on third parties for key functions including foundries for wafer supplies, subcontractors for assembly, test, packaging services and vendors for logistics and problems at these third parties could adversely affect our business and operating results.

We depend on third party subcontractors, primarily in Asia for wafer fabrication, assembly, test and packaging of an increasing portion of our products. At the end of fiscal year 2012, approximately 82% of our wafer and 89% of our assembly and test requirements are currently sourced from third party foundries and subcontractors. We expect that these percentages may increase due, in part, to the manufacturing of our next-generation products by third party subcontractors in Asia and from activity at recently acquired operations.

Our wafer designs requirements are increasing in technological complexity and in order to meet our design specifications, our foundry partners must expend resources for capital equipment and to develop or improve manufacturing processes. Our foundry partners' inability or unwillingness to expend these resources could adversely affect our business and operating results. The assembly, testing and packaging of our products is performed by a limited group of subcontractors. Disruption or termination of any of these subcontractors could occur and such disruptions or terminations could harm our business and operating results.

27

We utilize third party logistics services, including transportation, warehouse and shipping services. These service providers are subject to interruptions that affect their ability to service us, including the availability of transportation services, disruptions related to work stoppages, volatility in fuel prices and security incidents or natural events at manufacturing, shipping or receiving points or along transportation routes.

We generally do not have any long-term agreements with our subcontractors. As a result, we may be unable to directly control our quality assurance and product delivery schedules. The cost of product replacements or returns and other warranty matters in connection with quality assurance problems caused by third party subcontractors could materially adversely affect us. Third party manufacturers generally will have longer lead times for delivery of products as compared with our internal manufacturing, and therefore, when ordering from these suppliers, we will be required to make longer-term estimates of our customers' current demand for products, and these estimates are difficult to make accurately. Also, due to the amount of time typically required to qualify assemblers and testers, we could experience delays in the shipment of our products if we are forced to find alternate third parties to assemble or test our products. Any product delivery delays in the future could have a material adverse effect on our operating results, financial condition and cash flows. Our operations and ability to satisfy customer obligations could be adversely affected if our relationships with these subcontractors were disrupted or terminated. In addition, these subcontractors must be qualified by the U.S. government or customers for high-reliability processes. Historically the Defense Supply Center Columbus (DSCC) has rarely qualified any foreign manufacturing or assembly lines for reasons of national security; therefore, our ability to move certain manufacturing offshore may be limited or delayed.

In the event that any of our subcontractors were to experience financial, operational, production or quality assurance difficulties resulting in a reduction or interruption in supply to us, our operating results could suffer until alternate qualified subcontractors, if any, were to become available and active.

Reliance on government contracts for a portion of our sales could have a material adverse effect on results of operations.

Some of our sales are or may be derived from customers whose principal sales are to the United States government. These sales are or may be derived from direct and indirect business with the U.S. Department of Defense and other U.S. government agencies. Future sales are subject to the uncertainties of governmental appropriations and national defense policies and priorities, including impacts of sequestration under the Budget Control Act of 2011, constraints of the budgetary process and timing and potential changes in these policies and priorities. If we experience significant reductions or delays in procurements of our products by the U.S. government or terminations of government contracts or subcontracts, our operating results could be materially and adversely affected. Generally, the U.S. government and its contractors and subcontractors may terminate their contracts with us for cause or for convenience. We have in the past experienced one termination of a contract due to the termination of the underlying government contract. All government contracts are also subject to price renegotiation in accordance with the U.S. Government Renegotiation Act. By reference to such contracts, all of the purchase orders we receive that are related to government contracts are subject to these possible events. There is no guarantee that we will not experience contract terminations or price renegotiations of government contracts in the future.

In addition, we are required to maintain compliance with government regulations, particularly for our facilities and products that service the defense and security markets. Maintaining compliance requires that we devote resources to matters that include training, personnel, information technology and facilities. Failure to maintain compliance may result in the loss of certifications, fines and penalties that may materially and adversely affect our operating results.

Microsemi's aggregate net sales to the Defense & Security end market represented approximately 32% of total net sales in the first six months of fiscal 2013. From time to time, we have experienced declining security- and defense-related sales, primarily as a result of contract award delays and reduced security and defense program funding. We may be unable to adequately forecast or respond to the timing of and changes to demand for security- and defense-related products. In the past, defense-related spending on programs that we participate in has increased at a rate that has been slower than expected, been delayed or declined. Our prospects for additional security- and defense-related sales may be adversely affected in a material manner by numerous events or actions outside our control.

Provisions in our credit facility and our current leverage could adversely affect our consolidated financial position and our ability to operate our business.

Our credit facility requires that we comply with financial and restrictive covenants. Although we are currently in compliance with these covenants, unexpected downturns in our business may trigger certain covenants that increase our cost of borrowing, decrease the amounts available under our credit facility, or both. The current amount outstanding on our credit facility exceeds our current cash and cash equivalents balance, and we may incur additional debt in the future. Some of the risks that are associated with our leverage include the following:

• our ability to obtain additional financing in the future for acquisitions, capital expenditures, general corporate purposes or other purposes may be impaired;

28

• our current credit facility only permits borrowing on variable rates of interest and increases in certain benchmark interest rates will increase the cost of borrowing;  

• leverage will increase our vulnerability to declining economic conditions, particularly if the decline is prolonged;  

• failure to comply with any of our debt covenants may result in an event of default which, if not cured or waived, could have a material adverse effect on us;  

• financial and restrictive covenants may adversely affect our ability to implement business plans, react to changes in economic conditions or benefit from changes in tax regulations;  

• debt service payments will continue to have a negative impact on our cash flows; and

• prepayment terms may discourage us from refinancing our current credit agreement or reduce the benefit of lower interest rates.

We are subject to laws, regulations and similar requirements, changes to which may adversely affect our business and operations.

We are subject to laws, regulations and similar requirements that affect our business and operations, including, but not limited to, the areas of commerce, import and export control (especially related to products in our Defense & Security end market), intellectual property, income and other taxes, anti-trust, anti-corruption, labor, environmental, health and safety. Our compliance in these areas may be costly, especially in areas where there are inconsistencies between the various jurisdictions in which we operate. While we have implemented policies and procedures to comply with laws and regulations, there can be no assurance that our employees, contractors, suppliers or agents will not violate such laws and regulations or our policies. Any such violation or alleged violation could materially and adversely affect our business. Any changes or potential changes to laws, regulations or similar requirements, or our ability to respond to these changes, may significantly increase our costs to maintain compliance or result in our decision to limit our business, products or jurisdictions in which we operate, any of which could materially and adversely affect our business and operations.

The Dodd-Frank Wall Street Reform and Consumer Protection Act includes provisions regarding certain minerals and metals, known as conflict minerals, mined from the Democratic Republic of Congo and adjoining countries. These provisions require companies to undertake due diligence procedures and report on the use of conflict minerals in its products, including products manufactured by third parties. Compliance with these provisions will cause us to incur costs to certify that our supply chain is conflict free and we may face difficulties if our suppliers are unwilling or unable to verify the source of their materials. Our ability to source these minerals and metals may also be adversely impacted. In addition, our customers may require that we provide them with a certification and our inability to do so may disqualify us as a supplier.

Unanticipated changes in our tax provisions or exposure to additional income tax liabilities could affect our financial results.

We are subject to income taxes in the United States and numerous foreign jurisdictions. Our tax liabilities are affected by the amounts we record in intercompany transactions for inventory, services, licenses, funding and other items. We are subject to ongoing tax examinations in various jurisdictions. Tax authorities may disagree with our intercompany charges or other matters and assess additional taxes. Our application of transfer pricing has been the primary subject of the current examination of our U.S. federal income tax returns. We regularly assess the likely outcomes of examinations in order to determine the appropriateness of our tax provision. However, the actual outcomes of examinations could have a material impact on our financial condition. In addition, our effective tax rate in the future could be adversely affected by changes in the mix of earnings in countries with differing statutory tax rates and benefits, changes in the valuation of deferred tax assets and liabilities, changes in tax laws, especially tax laws related to foreign operations, and the discovery of new information in the course of our tax return preparation process. Any of these changes could affect our operating results, cash flows and financial condition.

29

Our operating results may fluctuate in future periods, which could cause our stock price to decline.

We have experienced, and expect to experience in future periods, fluctuations in net sales and operating results from period to period. Our projections and results may be subject to significant fluctuations as a result of a number of factors including:

• the timing of orders from and shipment of products to major customers;

• an unexpected reduction in sales to, or loss of, key customers;

• our product mix;

• changes in the prices of our products;

• manufacturing delays or interruptions;

• delays or failures in testing and processing products for defense, security and aerospace applications;

• inventory obsolescence or write-downs;

• restructuring charges;

• variations in the cost of components for our products;

• limited availability of components that we obtain from a single or a limited number of suppliers; and

• seasonal and other fluctuations in demand for our products.

We have in the past closed, combined, sold or disposed of certain of our operations, have current plans to combine certain of our operations and may determine to do so in the future, which could reduced our sales volume and result in significant restructuring costs.

In September 2009, we approved consolidation plans that resulted in the closure of our manufacturing facility in Scottsdale, Arizona during the quarter ended April 3, 2011. Scottsdale represented approximately 1% of our annual net sales in fiscal year 2011 and occupied a 135,000 square foot leased facility. We face major technical challenges in regard to transferring component manufacturing between locations. Before a transfer of manufacturing, we must be finished qualifying the new facility appropriately with the U.S. government or certain customers. In addition, to mitigate the potential for manufacturing disruptions following a closure, we typically build inventory to support the transition process. While we plan generally to retain revenues and income of those operations by transferring the manufacturing elsewhere within Microsemi's subsidiaries, our plans may change at any time based on reassessment of the alternatives and consequences. While we hope to benefit overall from increased gross margins and increased capacity utilization rates at remaining operations, the remaining operations will need to bear the corporate administrative and overhead costs, which are charges to income that had been allocated to the discontinued business units. Moreover, delays in effecting our consolidations could result in changes in the timing of realized costs savings and in greater than anticipated costs incurred to achieve the hoped for longer-range savings.

In October 2003, we announced the consolidation of the manufacturing operations of Microsemi Corp. - Santa Ana, of Santa Ana, California into some of our other facilities. The Santa Ana facility, whose manufacturing represented approximately 13% of our annual net sales in fiscal year 2004, had approximately 380 employees and occupied 123,000 square feet. In April 2005, we announced the consolidation of the high-reliability products operations of Microsemi Corp. - Colorado of Broomfield, Colorado (“Broomfield”) into some of our other facilities. Broomfield represented approximately 5% of our annual net sales in fiscal year 2009, had approximately 50 employees and occupied a 130,000 square foot owned facility.

We may make further specific determinations to consolidate, close, sell or divest of additional facilities, operations or product lines, which could be announced at any time. Possible adverse consequences from current and future consolidation or disposition activities may include a loss of revenues and various accounting charges such as for workforce reduction, including severance and other termination benefits and for excess facilities, including lease termination fees, future contractual commitments to pay lease charges, facility remediation costs and moving costs to remove property and equipment from facilities. We may also be adversely impacted from inventory buildup in preparation for the transition of manufacturing, disposition costs, impairments of goodwill, a possible immediate loss of revenues, and other items in addition to normal or attendant risks and uncertainties. We may be unsuccessful in any of our current or future efforts to consolidate our business into a smaller number of facilities. Our plans to minimize or eliminate any loss of revenues during consolidation may not be achieved.

We may not be able to develop new technologies and products to satisfy changes in customer demand, and our competitors could develop products that decrease the demand for our products.

Rapidly changing technologies and industry standards, along with frequent new product introductions, characterize the semiconductor industry. Our financial performance depends, in part, on our ability to design, develop, manufacture, assemble,

30

test, market and support new products and enhancements on a timely and cost-effective basis. If we are unable to continue to reduce package sizes, improve manufacturing yields and expand sales, we may not remain competitive. Our recent spending on research and development was principally to develop new higher-margin application-specific products, including, among others, our 65nm process development for next generation programmable products, higher power PoE solutions, the continued roadmap development of our industry-leading timing & synchronization products, our SiGe RF power amplifier solutions for wireless LAN applications, and the ongoing development of GaN and SiC power management and RF solutions. The competitiveness of designs that we have introduced, including power-over-ethernet, CCFL and LED drivers, class-D audio amplifiers, InGaP RF power amplifiers for wireless LAN applications, development and adoption of silicon carbide technology, ASICs, VDMOS products for high frequency communications and S-band products for RF applications, are subject to various risks and uncertainties that we are not able to control, including changes in customer demand and the introduction of new or superior technologies by others. Moreover, any failure by us in the future to develop new technologies or timely react to changes in existing technologies could materially delay our development of new products, which could result in product obsolescence, decreased revenues and a loss of our market share to our competitors. New technologies or products that we may develop may not lead to an incremental increase in revenues, and there is a risk that these new technologies or products will decrease the demand for our existing products and result in an offsetting reduction in revenues. In addition, products or technologies developed by others may render our products or technologies obsolete or non-competitive. A fundamental shift in technologies in our product markets could have a material adverse effect on our competitive position within the industry.

We must commit resources to research and development, design, and production prior to receipt of purchase commitments and could lose some or all of the associated investment.

We sell products primarily pursuant to purchase orders for current delivery, rather than pursuant to long-term supply contracts. Many of these purchase orders may be revised or canceled without penalty. As a result, we must commit resources to the research, design and production of products without any advance purchase commitments from customers. Any inability to sell a product after we devote significant resources to it could have a material adverse effect on our business, financial condition, results of operations and cash flows.

31

International operations and sales expose us to material risks and may increase the volatility of our operating results.

Net sales from international markets represent a significant portion of total net sales and totaled 47% in fiscal 2013. These sales were principally to customers in Europe and Asia. Foreign sales are classified as shipments to foreign destinations. We maintain several international facilities or contracts with entities outside the United States, including Canada, China, France, India, Ireland, Israel, Japan, Korea, Malaysia, Macau, the Philippines, Taiwan, Thailand and the United Kingdom. There are risks inherent in doing business internationally, including:

• legislative or regulatory requirements and potential changes in or interpretations of requirements in the United States and in the countries in which we manufacture or sell our products;

• tax regulations and treaties and potential changes in regulations and treaties in the United States and in and between countries in which we manufacture or sell our products;

• fluctuations in income tax expense and net income due to differing statutory tax rates in various domestic and international jurisdictions;

• trade restrictions;

• uncertain interpretations of and difficulties enforcing intellectual property laws;

• local business and cultural factors that may differ from our domestic standards and practices, including business practices from which we are prohibited from engaging by the Foreign Corrupt Practices Act (the "FCPA") and other anti-corruption laws and regulations;

• availability of transportation services, including disruptions related to work stoppages, security incidents or natural events at manufacturing, shipping or receiving points or along transportation routes;

• work stoppages or disruption of local labor supply;

• communication interruptions;

• economic and political instability, including the recent uncertainty in the global financial markets;

• acts of war or terrorism, or health issues (such as Sudden Acute Respiratory Syndrome, Avian Influenza or the H1N1 Virus), which could disrupt our manufacturing and logistical activities;

• compliance with and changes in import/export regulations;

• changes in tariffs and freight rates;

• difficulties in collecting receivables and enforcing contracts generally;

• restrictions in the transfer or repatriation of funds; and

• currency exchange rate fluctuations, devaluation of foreign currencies, hard currencies shortages and exchange rate fluctuations.

International sales of our products that service the defense and security markets are subject to U.S. and local government regulations and procurement policies and practices including regulations relating to import-export control. Violations of export control regulations could result in suspension of our ability to export our products. Depending on the scope of the suspension, this could have a material effect on our ability to perform certain international contracts. In addition, failure to maintain compliance with U.S. and foreign government regulations, including the FCPA and foreign anti-corruption measures, may result in fines and penalties that may materially and adversely affect our operating results.

If political, military, transportation, health or other issues in foreign countries result in cancellations of customer orders or contribute to a general decrease in economic activity or corporate spending, or directly impact Microsemi's marketing, manufacturing, financial and logistics functions, our consolidated results of operations and financial condition could be materially adversely affected. In addition, the laws of certain foreign countries may not protect our products, assets or intellectual property rights to the same extent as do U.S. laws. Therefore, the risk of piracy of our technology and products, which could result in a material adverse effect on our financial condition, operating results and cash flows, may be greater in those foreign countries.

There may be unanticipated costs associated with appropriately scaling our manufacturing capacity to meet expected changes in customer demand.

We may incur unanticipated costs as we scale our manufacturing capacity to meet expected changes in customer demand. During periods of anticipated increases in customer demand, we may determine that our business will require

32

increased manufacturing capacity on our part and on the part of certain outside foundries, assembly shops, or testing facilities for some of our integrated circuit products or other products. Expansion activities are subject to a number of risks, including:

• unavailability or late delivery of the advanced, and often customized, equipment used in the production of our specialized products;

• availability of qualified manufacturing personnel;

• delays in bringing new production equipment on-line;

• delays in supplying satisfactory designs or products to our existing customers;

• unforeseen environmental, engineering or manufacturing qualification problems relating to existing or new facilities; and

• overexpansion may result in unfavorable manufacturing variances, restructuring costs and impairments.  

These and other risks may affect the ultimate cost and timing of any expansion of our capacity.

Downturns in the highly cyclical semiconductor industry have in the past adversely affected our operating results, cash flows and the value of our business, and may continue to do so in the future.

The semiconductor industry is highly cyclical and is characterized by constant technological change, rapid product obsolescence and price erosion, short product life-cycles, consolidations of customers, and fluctuations in product supply and demand. During recent years we, as well as many others in our industry, have experienced significant declines in the pricing of, as well as demand for, products during the “down” portions of these cycles, which have sometimes been severe and prolonged. We have also noted consolidations of customers, particularly our distributors, which may adversely affect our pricing leverage or ability to maintain sufficient distributor channel inventory to meet end customer demand. In the future, these downturns may prove to be as, or possibly even more, severe than past ones. Our ability to sell our products depends, in part, on continued demand in each of our diverse end markets. Each of these end markets has in the past experienced reductions in demand, and current and future downturns in any of these markets may continue to adversely affect our revenues, operating results, cash flows and financial condition.

The semiconductor business is subject to downward price pressure.

The market for our products has been characterized by declining selling prices, and we anticipate that our average selling prices will decrease in future periods, although the timing and amount of these decreases cannot be predicted with any certainty. The pricing pressure in the semiconductor industry in past years has been due to a large number of factors, many of which were not easily foreseeable, such as the Asian currency crisis, industry-wide excess manufacturing capacity, weak economic growth, the slowdown in capital spending that followed the “dot-com” collapse, the reduction in capital spending by telecom companies and satellite companies, and the effects of the tragic events of terrorism on September 11, 2001. Similar to past years, recent unfavorable economic conditions have resulted in a tightening of the credit markets. If signs of improvement in the global economy do not progress as expected and global economic conditions worsen, we may experience a decline in our average selling prices. In addition, our competitors have in the past, and may again in the future, lower prices in order to increase their market share. Continued downward price pressure in the industry may reduce our operating results and harm our financial and competitive position.

The semiconductor industry is highly competitive.

The semiconductor industry, including the areas in which we do business, is highly competitive. We expect intensified competition from existing competitors and new entrants. Competition is based on price, product performance, product availability, quality, reliability and customer service. We compete in various markets with companies of various sizes, some of which are larger and have greater financial and other resources than we have, and thus may be better able to pursue acquisition candidates and to withstand adverse economic or market conditions. In addition, companies not currently in direct competition with us may introduce competing products in the future. Some of our current major competitors are Aeroflex Holding Corporation; Altera Corporation; Fairchild Semiconductor International, Inc.; Freescale Semiconductor, Inc.; Texas Instruments, Inc.; Integrated Device Technology, Inc.; International Rectifier Corp.; Linear Technology Corp.; M/A COM Technology Solutions Inc.; Maxim Integrated Products, Inc.; Micrel Incorporated; Monolithic Power Systems, Inc.; O2Micro International, Ltd.; Semtech Corp.; Silicon Laboratories, Inc.; Skyworks Solutions, Inc.; Supertex, Inc. and Xilinx, Inc. Some of our competitors in developing markets are Integrated Device Technology, Inc.; Semtech Corp.; Silicon Laboratories, Inc.; Skyworks Solutions, Inc. and Triquint Semiconductor, Inc. Several of these companies are larger than we are and have greater resources than we have and may therefore be better able than we are to penetrate new markets, pursue acquisition candidates, and withstand adverse economic or market conditions. We expect intensified competition from both these existing competitors and new entrants into our markets. To the extent we are not able to compete successfully in the future, our financial condition, operating results or cash flows could be harmed.

33

Compound semiconductor products may not successfully compete with silicon-based products.

Our choices of technologies for development and future implementation may not reflect future market demand. The production of gallium arsenide (GaAs), indium gallium phosphide (InGaP), silicon germanium (SiGe), indium gallium arsenide phosphide (InGaAsP) or silicon carbide (SiC) integrated circuits is more costly than the production of silicon circuits, and we believe it will continue to be more costly in the future. The costs differ because of higher costs of raw materials, lower production yields and higher unit costs associated with lower production volumes. Silicon semiconductor technologies are widely used in process technologies for integrated circuits, and these technologies continue to improve in performance. As a result, we must offer compound semiconductor products that provide vastly superior performance to that of silicon for specific applications in order for our products to be competitive with silicon products. If we do not offer compound semiconductor products that provide sufficiently superior performance to offset the cost differential and otherwise successfully compete with silicon-based products, our revenues and operating results may be materially and adversely affected.

Production delays related to new compound semiconductors could adversely affect our future results.

We utilize process technology to manufacture compound semiconductors such as GaAs, InGaP, SiGe, SiC and InGaAsP primarily to manufacture semiconductor components. We are pursuing this development effort internally as well as with third party foundries. Our efforts sometimes may not result in commercially successful products. Certain competitors offer this capability and our customers may purchase our competitors' products instead of ours for this reason. In addition, the third party foundries that we use may delay delivery of, or even completely fail to deliver, technology and products to us. Our business and financial prospects could be materially and adversely affected by any failure by us to timely produce these products.

We may be unable to retain our customers due in part to our inability to fulfill our customer demand and other factors.

Our ability to fulfill our customers' demand for our products is and will continue to be dependent in part on our order volumes and long lead times with regard to our manufacturing and testing of certain high-reliability products. The lead time for manufacturing and testing of high-reliability products can be many months. In response to current demand, we have recently increased our capital expenditures for production equipment as well as increased expenses for personnel at certain manufacturing locations. We may have delays or other difficulties in regard to increasing our production and in hiring and retaining qualified personnel. In addition, we have raised prices on certain products, primarily in our Aerospace, Defense & Security and Industrial end markets. Manufacturing delays and price increases may result in our customers reducing their purchase levels with us and/or seeking alternative solutions to meet their demand. In addition, the current demand may not continue in the future. Decreased sales as a result of a loss of one or more significant customers could materially and adversely impact our business and results of operations.

Unfavorable or uncertain conditions in certain retail markets that our OEM customers address may cause fluctuations in our rate of revenue growth or financial results.

Some of the principal markets we serve include consumer markets, such as mobile/connectivity and notebooks, monitors and LCD televisions. If domestic and global economic conditions worsen, overall consumer spending may be reduced or shifted to products other than those made by our customers, which would adversely impact demand for products in these markets. Reduced sales by our customers in these end markets will adversely impact demand by our customers for our products and could also slow new product introductions by our customers and by us. Lower net sales of our products would have an adverse effect on our revenue, cash flow and results of operations.

Fluctuations in sales of high-reliability products for use in implantable defibrillators may adversely affect our financial results.

Although the market for implantable defibrillators is growing, customers in this market could reduce their reliance on outside suppliers. The implantable defibrillator market also fluctuates based on several other factors, such as product recalls and the need to secure regulatory approvals. Product recalls can from time to time accelerate sales to levels that cannot be sustained for long periods of time. The timing and qualification of new generations of products brought to market by OEMs can also result in fluctuations in order rates.

Variability of our manufacturing yields may affect our gross margins and profits.

Our manufacturing yields vary significantly among products, depending on the complexity of a particular product's design and our experience in manufacturing that type of product. We have in the past experienced difficulties in achieving planned yields, which have adversely affected our gross margins and profits.

34

The fabrication of semiconductor products is a highly complex and precise process. Problems in the fabrication process can cause a substantial percentage of wafers to be rejected or numerous circuits on each wafer to be non-functional, thereby reducing yields. These difficulties include:

• defects in masks, which are used to transfer circuit patterns onto our wafers;

• impurities in the materials used;

• contamination of the manufacturing environment; and

• equipment failure.

Because a large portion of our costs of manufacturing is relatively fixed and average selling prices for our products tend to decline over time, it is critical for us to improve the number of shippable circuits per wafer and increase the production volume of wafers in order to maintain and improve our results of operations. Yield decreases can result in substantially higher unit costs, which could materially and adversely affect our operating results and have done so in the past. Moreover, our process technologies have primarily utilized standard silicon semiconductor manufacturing equipment, and production yields of compound integrated circuits have been relatively low compared with silicon circuit devices. We may be unable to continue to improve yields in the future, and we may suffer periodic yield problems, particularly during the early production of new products or introduction of new process technologies. In either case, our results of operations could be materially and adversely affected.

Some of our facilities are located near major earthquake fault lines.

Our headquarters, our major operating facilities, and certain other critical business operations are located near known major earthquake fault lines. We presently do not have earthquake insurance. We could be materially and adversely affected in the event of a major earthquake.

Delays in beginning production, implementing production techniques, resolving problems associated with technical equipment malfunctions, or issues related to government or customer qualification of facilities could adversely affect our manufacturing efficiencies and our ability to realize cost savings.

Microsemi's consolidated manufacturing efficiency will be an important factor in our future profitability, and we may be unsuccessful in our efforts to maintain or increase our manufacturing efficiency. Our manufacturing processes, and those utilized by our third-party subcontractors, are highly complex, require advanced and costly equipment and are sometimes modified in an effort to improve yields and product performance. We have from time to time experienced difficulty in transitioning manufacturing processes to different facilities or adopting new manufacturing processes. As a consequence, we have at times experienced delays in product deliveries and reduced yields. Every silicon wafer fabrication facility utilizes very precise processing, and processing difficulties and reduced yields commonly occur, often as a result of contamination of the material. Reduced manufacturing yields can often result in manufacturing and shipping delays due to capacity constraints. Therefore, manufacturing problems can result in additional operating expenses and delayed or lost revenues. In one instance, which occurred in fiscal year 2005, Microsemi scrapped nonconforming inventory at a cost of approximately $1 million and experienced a delay of approximately two months in realizing approximately $1.5 million of net sales. In an additional instance, which occurred in fiscal year 2004, Microsemi encountered a manufacturing problem concerning contamination in a furnace that resulted in the quarantine of approximately one million units at a cost of approximately $2 million. The identification and resolution of that manufacturing issue required four months of effort to investigate and resolve, which resulted in a concurrent delay in realizing approximately $2 million of net sales. Microsemi may experience manufacturing problems in achieving acceptable yields or experience product delivery delays in the future as a result of, among other things, upgrading existing facilities, relocating processes to different facilities, or changing its process technologies, any of which could result in a loss of future revenues or an increase in manufacturing costs.

Interruptions, delays or cost increases affecting our materials, parts, equipment or subcontractors may impair our competitive position.

Our manufacturing operations, and the outside manufacturing operations that we use increasingly, in some instances depend upon obtaining a governmental qualification of the manufacturing process, and in all instances, adequate supplies of materials including wafers, parts and equipment (including silicon, mold compounds and lead frames) on a timely basis from third parties. Some of the outside manufacturing operations we use are based in foreign countries. Our results of operations could be adversely affected if we are unable to obtain adequate supplies of materials, parts and equipment in a timely manner or if the costs of materials, parts or equipment increase significantly. From time to time, suppliers may extend lead times, limit supplies or increase prices due to capacity constraints or other factors. Although we generally use materials, parts and equipment available from multiple suppliers, we have a limited number of suppliers for some materials, parts and equipment. In addition, if signs of improvement in the global economy do not progress as expected and global economic conditions worsen, our suppliers may cease operations or be unable to obtain capital at adequate or historical levels to finance their ongoing

35

businesses and operations, which could impair their ability to continue to supply us. If alternate suppliers for these materials, parts and equipment are not available, our operations could be interrupted, which would have a material adverse effect on our operating results, financial condition and cash flows.

Fixed costs may reduce operating results if our sales fall below expectations.

Our expense levels are based, in part, on our expectations for future sales. Many of our expenses, particularly those relating to capital equipment and manufacturing overhead, are relatively fixed. We might be unable to reduce spending quickly enough to compensate for reductions in sales. Accordingly, shortfalls in sales could materially and adversely affect our operating results. This challenge could be made even more difficult if lead times between orders and shipments are shortening.  

Failure to manage consolidation of operations effectively could adversely affect our margins and earnings.

Our ability to successfully offer and sell our products requires effective planning and management processes. Our consolidations and realignments of operations, and expected future growth, may place a significant strain on our management systems and resources, including our financial and managerial controls, reporting systems, procedures and information technology. In addition, we will need to continue to train and manage our workforce worldwide. Any unmet challenges in that regard could negatively affect our results of operations.

Any failure by us to protect our proprietary technologies or maintain the right to use certain technologies may negatively affect our ability to compete.

We rely heavily on our proprietary technologies. Our future success and competitive position depend in part upon our ability to obtain or maintain protection of certain proprietary technologies used in our principal products. We do not have significant patent protection on many aspects of our technology. The protection of some of our technology as “trade secrets” will not necessarily protect us from all uses by other persons of our technology, or their use of technology that is similar or superior to that which is embodied in our trade secrets. In addition, others may be able to independently duplicate or exceed our technology in whole or in part. In the instances in which we hold patents or patent licenses, such as with respect to some circuit components for notebook computers and LCD TVs, any patents held by us may be challenged, invalidated or circumvented, or the rights granted under any patents may not provide us with competitive advantages. Patents often provide only narrow protection and require public disclosure of information that may otherwise be subject to trade secret protection. In addition, patents eventually expire and are not renewable.

Obtaining or protecting our proprietary rights may require us to defend claims of intellectual property infringement by our competitors. We could also become subject to lawsuits in which it is alleged that we or companies we have acquired have infringed or are infringing upon the intellectual property rights of others with or without our prior awareness of the existence of those third-party rights, if any. Litigation in connection with our intellectual property, whether instituted by us or others, could be very costly and distract management and other resources from our business. We are currently involved in certain patent litigation to protect our patents and patent rights, which could cause legal costs to increase above normal levels over the next several years. It is not possible to estimate the exact amounts of these costs, but it is possible that these costs could have a negative effect on our future results.

Moreover, if any infringement, real or imagined, happens to exist, arise or is claimed in the future, we may be exposed to substantial liability for damages and may need to obtain licenses from the patent owners, discontinue or change our processes or products or expend significant resources to develop or acquire non-infringing technologies. We may not be successful in such efforts, or such licenses may not be available under reasonable terms. Any failure by us to develop or acquire non-infringing technologies or to obtain licenses on acceptable terms could have a material adverse effect on our operating results, financial condition and cash flows.

Our products may be found to be defective or hazardous and we may not have sufficient liability insurance.

There is at any time a risk that our products may be found to be defective or to contain, without the customer's knowledge, certain prohibited hazardous chemicals after we have already shipped the products in volume, perhaps requiring a product replacement or recall. We may be subject to product returns that could impose substantial costs and have a material and adverse effect on our business, financial condition and results of operations. Our aerospace, defense, and industrial businesses in particular expose us to potential liability risks that are inherent in the manufacturing and marketing of high-reliability electronic components for critical applications. Production of many of these products is sensitive to minute impurities, which can be introduced inadvertently in manufacturing. Any production mistake can result in large and unanticipated product returns, product liability and warranty liability. Environmental regulations have imposed on every major participant in the electronics industry a new burden of determining and tracking the presence and quantity of certain chemicals in the content of supplies we buy and add to our products for sale and to inform our customers about each of our finished goods' relevant chemical contents. The management and execution of this process is very challenging, and mistakes in this information gathering process could have a material adverse effect on our business.

36

We may be subject to product liability claims with respect to our products. Our product liability insurance coverage may be insufficient to pay all such claims. In addition, product liability insurance may become too costly for us to maintain or may become completely unavailable to us in the future. We may not have sufficient resources to satisfy any product liability claims not covered by insurance, which would materially and adversely affect our financial position.

Environmental liabilities could adversely impact our consolidated financial position.

Federal, state and local laws and regulations impose various restrictions and controls on the discharge of materials, chemicals and gases used in our semiconductor manufacturing processes or in our finished goods. Under recent environmental regulations, we are responsible for determining whether certain toxic metals or certain other toxic chemicals are present in any given component we purchase and in each given product we sell. These environmental regulations have required us to expend a portion of our resources and capital on relevant compliance programs. In addition, under other laws and regulations, we could be held financially responsible for remedial measures if our current or former properties are contaminated or if we send waste to a landfill or recycling facility that becomes contaminated, even if we did not cause the contamination. Also, we may be subject to additional common law claims if we release substances that damage or harm third parties. Further, future changes in environmental laws or regulations may require additional investments in capital equipment or the implementation of additional compliance programs in the future. Any failure to comply with existing or future environmental laws or regulations could subject us to significant liabilities and could have a material adverse effect on our operating results, cash flows and financial condition.

In the conduct of our manufacturing operations, we have handled and do handle materials that are considered hazardous, toxic or volatile under federal, state and local laws. The risk of accidental release of such materials cannot be completely eliminated. In addition, we operate or own facilities located on or near real property that was formerly owned and operated by others. These properties were used in ways that involved hazardous materials. Contaminants may migrate from, within or through any such property, which may give rise to claims against us. Third parties who are responsible for contamination may not have funds, or may not make funds available when needed, to pay remediation costs imposed upon us jointly with them under environmental laws and regulations.

In Broomfield, Colorado, the owner of a property located adjacent to a manufacturing facility owned by one of our subsidiaries, Microsemi Corp. - Colorado, had notified the subsidiary and other parties of a claim that contaminants migrated to his property, thereby diminishing its value. In August 1995, the subsidiary, together with Coors Porcelain Company, FMC Corporation and Siemens Microelectronics, Inc. (former owners of the manufacturing facility), agreed to settle the claim and to indemnify the owner of the adjacent property for remediation costs. Although TCE and other contaminants previously used by former owners at the facility are present in soil and groundwater on the subsidiary's property, we vigorously contest any assertion that our subsidiary caused the contamination. In November 1998, we signed an agreement with the three former owners of this facility whereby they have 1) reimbursed us for $0.5 million of past costs, 2) assumed responsibility for 90% of all future clean-up costs, and 3) promised to indemnify and protect us against any and all third-party claims relating to the contamination of the facility. An Integrated Corrective Action Plan was submitted to the State of Colorado. Sampling and management plans were prepared for the Colorado Department of Public Health & Environment. State and local agencies in Colorado are reviewing current data and considering study and cleanup options. The most recent forecast estimated that the total project cost, up to the year 2020, would be approximately $5.3 million; accordingly, we recorded a one-time charge of $0.5 million for this project in 2003. There has not been any significant development since September 28, 2003.

Litigation could adversely impact our consolidated financial position.

We are and have been involved in various litigation matters, including from time to time, litigation relating to employment matters, commercial transactions, intellectual property matters, contracts, environmental matters and matters related to compliance with governmental regulations. Litigation is inherently uncertain and unpredictable. The potential risks and uncertainties include, but are not limited to, such factors as the costs and expenses of litigation and the time and attention required of management to attend to litigation. An unfavorable resolution of any particular legal claim or proceeding, and/or the costs and expenses incurred in connection with a legal claim or proceeding, could have a material adverse effect on our consolidated financial position or results of operations.

Our future success depends, in part, upon our ability to continue to attract and retain the services of our executive officers or other key management or technical personnel.

We could potentially lose the services of any of our senior management personnel at any time due to a variety of factors that could include, without limitation, death, incapacity, military service, personal issues, retirement, resignation or competing employers. Our ability to execute current plans could be adversely affected by such a loss. We may fail to attract and retain qualified technical, sales, marketing and managerial personnel required to continue to operate our business successfully. Personnel with the expertise necessary for our business are scarce and competition for personnel with proper skills is intense. Also, attrition in personnel can result from, among other things, changes related to acquisitions, retirement and disability. We may not be able to retain existing key technical, sales, marketing and managerial employees or be successful in attracting,

37

assimilating or retaining other highly-qualified technical, sales, marketing and managerial personnel, particularly at such times in the future as we may need to fill a key position. If we are unable to continue to retain existing executive officers or other key employees or are unsuccessful in attracting new highly-qualified employees, our business, financial condition and results of operations could be materially and adversely affected.

The volatility of our stock price could affect the value of an investment in our stock and our future financial position.

The market price of our stock has fluctuated widely. Between October 2, 2011 and March 31, 2013, the market sale price of our common stock ranged between a low of $14.82 and a high of $23.28. The historic market price of our common stock may not be indicative of future market prices. We may not be able to sustain or increase the value of our common stock. The trading price of our common stock may be influenced by factors beyond our control, such as the recent unprecedented volatility of the financial markets and the current uncertainty surrounding domestic and foreign economies. Declines in the market price of our stock could adversely affect our ability to retain personnel with stock incentives, to acquire businesses or assets in exchange for stock and/or to conduct future financing activities with or involving our common stock.

We may not make the sales that are suggested by our order rates, backlog or book-to-bill ratio, and our book-to-bill ratio may be affected by product mix.

Prospective investors should not place undue reliance on our book-to-bill ratios or changes in book-to-bill ratios. We determine bookings substantially based on orders that are scheduled for delivery within 12 months. However, lead times for the release of purchase orders depend, in part, upon the scheduling practices of individual customers, and delivery times of new or non-standard products can be affected by scheduling factors and other manufacturing considerations. The rate of booking new orders can vary significantly from month to month. Customers frequently change their delivery schedules or cancel orders. We have in the past experienced long lead times for some of our products, which may have therefore resulted in orders in backlog being duplicative of other orders in backlog, which would increase backlog without resulting in additional revenues. Because of long lead times in certain products, our book-to-bill ratio may not be an indication of sales in subsequent periods. Uncertain worldwide economic conditions and market instability have also resulted in hesitance of our customers to place orders with long delivery schedules, which contributes to limited visibility into our markets.

At times, our working capital levels have risen, which adversely affects cash flow.

At times, our working capital levels have risen and the increase has adversely affected cash flow. A factor contributing to the increase in our working capital has related to acquisitions with increases in accounts receivable and inventory generally exceeding increases in accounts payable and accrued liabilities. Another factor resulting in an increase in working capital has been a buildup of inventory prior to the consolidation of our manufacturing operations. We built inventory cushions during the transition of manufacturing between facilities in order to maintain an uninterrupted supply of product. Obsolescence of any inventory has recently and could in the future result in adverse effects on our future results of operations and future revenue. In 2009, in addition to other inventory write-downs, we recorded inventory write-downs of $10.3 million for product lines that did not meet gross margin targets, products that are being migrated to newer generations, and products that service the large capital spending end markets for which demand has declined and $7.3 million for estimated inventory components that were not expected to be used by the closure date of our Scottsdale facility and that cannot be used by other manufacturing facilities. During the quarter ended April 3, 2011, we recorded a charge of $8.4 million for the write-off of bridging inventory and an additional $8.2 million for the write-off of medical inventory.

There may be some potential effects of system outages or data security breaches, which could adversely affect our operations financial results or reputation.

We face risks from electrical or telecommunications outages, computer hacking or other general system failure. We rely heavily on our internal information and communications systems and on systems or support services from third parties to manage our operations efficiently and effectively. Any of these are subject to failure. System-wide or local failures that affect our information processing could have a material adverse effect on our business, financial condition, results of operations and cash flows. In addition, a system failure or data security breach could also result in the unintentional disclosure of confidential information about us, our customers or our employees, which could result in our incurring costs for remedial or preventative actions, damage our reputation with customers and reduce demand for our products and services. Further, insurance coverage does not generally protect from normal wear and tear, which can affect system performance. Any applicable insurance coverage for an occurrence could prove to be inadequate. Coverage may be or become unavailable or inapplicable to any risks then prevalent. We are upgrading and integrating, and have plans to upgrade and integrate further, our enterprise information systems, and these efforts may cause additional strains on personnel and system resources or may result in potential system outages.

38

Our investments in securities subject us to principal, liquidity and counterparty risks that could adversely affect our financial results.

We invest cash balances in excess of projected liquidity needs primarily in money market funds. At times, we have also entered into interest rate swap and foreign currency forward contracts. While all of our investments to date are highly rated and we believe our counterparties to be highly rated, current credit market disruptions may adversely affect the value and liquidity of these investments and may affect the ability of our counterparties to fulfill their contractual obligations.

We may have increasing difficulty attracting and retaining qualified outside Board members.

The directors and management of publicly traded corporations are increasingly concerned with the extent of their personal exposure to lawsuits and shareholder claims, as well as governmental and creditor claims that may be made against them in connection with their positions with publicly-held companies. Outside directors are becoming increasingly concerned with the availability of directors' and officers' liability insurance to pay on a timely basis the costs incurred in defending shareholder claims. Directors' and officers' liability insurance is expensive and difficult to obtain. The SEC and the NASDAQ Stock Market have also imposed higher independence standards and certain special requirements on directors of public companies. Accordingly, it may become increasingly difficult to attract and retain qualified outside directors to serve on our Board.

Delaware law and our charter documents contain provisions that could discourage or prevent a potential takeover of Microsemi that might otherwise result in our stockholders receiving a premium over the market price for their shares.

Provisions of Delaware law and our certificate of incorporation and bylaws could make more difficult an acquisition of Microsemi by means of a tender offer, a proxy contest, or otherwise, and the removal of incumbent officers and directors.

These provisions include:

• Section 203 of the Delaware General Corporation Law, which prohibits a merger with a 15%-or-greater stockholder, such as a party that has completed a successful tender offer, without board approval until three years after that party became a 15%-or-greater stockholder;

• The authorization in the certificate of incorporation of undesignated preferred stock, which could be issued without stockholder approval in a manner designed to prevent or discourage a takeover or in a way that may dilute an investment in our common stock; and

• Certain provisions of our charter documents, including provisions eliminating the ability of stockholders call special meetings and limiting the ability of stockholders to raise matters at a meeting of stockholders without giving advance notice, may have the effect of delaying or preventing changes in control or management of Microsemi. In addition, our charter documents do not permit cumulative voting, which may make it more difficult for a third party to gain control of our Board of Directors.

Our accounting policies and estimates have a material effect on the financial results we report.

Critical accounting policies and estimates have a material effect on our calculations and estimations of amounts in our financial statements. Our operating results and balance sheets may be adversely affected either to the extent that actual results prove to be materially lower than previous accounting estimates or to the extent that accounting estimates are revised adversely. We base our critical accounting policies, including our policies regarding revenue recognition, reserves for returns, rebates, price protections, and bad debt and inventory valuation, on various estimates and subjective judgments that we may make from time to time. The judgments made can significantly affect net income and our balance sheets. We are required to make significant judgments concerning inventory, and whether it becomes obsolete or excess, and concerning impairments of long-lived assets and of goodwill. Our judgments, estimates and assumptions are subject to change at any time. In addition, our accounting policies may change at any time as a result of changes in generally accepted accounting principles as they apply to us or changes in other circumstances affecting us. Changes in accounting policy have affected and could further affect, in each case materially and adversely, our results of operations or financial position.

If, in the future, we conclude that our internal control over financial reporting is not effective, investors could lose confidence in the reliability of our financial statements, which could result in a decrease in the value of our common stock.

As directed by Section 404 of the Sarbanes-Oxley Act of 2002, the SEC adopted rules requiring public companies to include a report of management on the companies' internal control over financial reporting in their annual reports on Form 10-K, including an assessment by management of the effectiveness of the filing company's internal control over financial reporting. In addition, the independent registered public accounting firm auditing a public company's financial statements must attest to the effectiveness of the company's internal control over financial reporting. There is a risk that in the future we may

39

identify internal control deficiencies that suggest that our controls are no longer effective. This could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our financial statements, which could cause the market price of our common stock to decline and make it more difficult for us to finance our operations.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Inapplicable.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Inapplicable.

ITEM 4. MINE SAFETY DEISCLOSURES

Inapplicable.

ITEM 5. OTHER INFORMATION

Inapplicable.

ITEM 6. EXHIBITS

Exhibit Number	Description
10.1	Amendment No. 4 to Credit Agreement, dated as of February 19, 2013, by and among Microsemi Corporation, Morgan Stanley Senior Funding, Inc., Morgan Stanley & Co. LLC and the lenders referred to therein (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K (File No. 0-08866) as filed with the Commission on February 22, 2013).
31.1	Certification of Chief Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
31.2	Certification of Chief Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
101	The following financial statements are from Microsemi Corporation’s Report on Form 10-Q for the quarter and six months ended March 31, 2013, formatted in XBRL (eXtensible Business Reporting Language): (i) Unaudited Consolidated Balance Sheets; (ii) Unaudited Consolidated Statements of Operations and Comprehensive Income; (iii) Unaudited Consolidated Statements of Cash Flows; and (iv) Condensed Notes to Unaudited Consolidated Financial Statements.†
†	Filed with this Report.

40

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Microsemi Corporation
By	/s/ John W. Hohener
	John W. Hohener
	Executive Vice President, Chief Financial Officer, Secretary and Treasurer (Principal Financial and Accounting Officer and duly authorized to sign on behalf of the Registrant)

Dated: April 30, 2013

41

EXHIBIT INDEX

Exhibit Number	Description
10.1	Amendment No. 4 to Credit Agreement, dated as of February 19, 2013, by and among Microsemi Corporation, Morgan Stanley Senior Funding, Inc., Morgan Stanley & Co. LLC and the lenders referred to therein (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K (File No. 0-08866) as filed with the Commission on February 22, 2013).
31.1	Certification of Chief Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
31.2	Certification of Chief Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated April 30, 2013†
101	The following financial statements are from Microsemi Corporation’s Report on Form 10-Q for the quarter and six months ended March 31, 2013, formatted in XBRL (eXtensible Business Reporting Language): (i) Unaudited Consolidated Balance Sheets; (ii) Unaudited Consolidated Statements of Operations and Comprehensive Income; (iii) Unaudited Consolidated Statements of Cash Flows; and (iv) Condensed Notes to Unaudited Consolidated Financial Statements.†
†	Filed with this Report.

42

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Peterson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Microsemi Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: April 30, 2013

/s/ James J. Peterson

James J. Peterson

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John W. Hohener, certify that:

1. I have reviewed this to Quarterly Report on Form 10-Q of Microsemi Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated: April 30, 2013

/s/ John W. Hohener

John W. Hohener

Executive Vice President, Chief Financial

Officer, Secretary and Treasurer

EX-32

Exhibit 32

CERTIFIED WRITTEN STATEMENT ACCOMPANYING

PERIODIC FINANCIAL REPORTS

(Pursuant to 18 U.S.C. 1350)

The undersigned, James J. Peterson, Chief Executive Officer, and John W. Hohener, Chief Financial Officer, of Microsemi Corporation, a Delaware corporation (the “Company”), each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that-

(1) the accompanying periodic report containing financial statements filed by the Company with the Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a)); and

(2) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

IN WITNESS WHEREOF, the undersigned have executed this certificate which accompanies the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2013.

Dated:	April 30, 2013	/s/ James J. Peterson
		James J. Peterson, President and Chief Executive Officer
Dated:	April 30, 2013	/s/ John W. Hohener
		John W. Hohener, Executive Vice President, Chief Financial Officer, Secretary and Treasurer

XML

STOCK-BASED COMPENSATION - Schedule of Restricted Shares and Performance Stock Units (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Apr. 01, 2012
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quantity	1,802	1,522
Fair Value per Award	$ 20.24	$ 19.30
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quantity	350	350
Fair Value per Award	$ 21.62	$ 17.77

XML

INCOME TAXES (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 3,380,000	$ 4,681,000	$ 6,343,000	$ 4,372,000
U.S. statutory rate			35.00%
Unrecognized tax benefit that would impact effective tax rate within next twelve months			$ 13,900,000
Minimum | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax years by major tax jurisdiction			2007
Maximum | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax years by major tax jurisdiction			2012

XML

STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of restricted shares and performance stock units

The quantity of restricted shares and performance stock units at target levels and their weighted-average fair value are as follows (quantity in thousands):

Six Months Ended	Quantity	Fair Value per Award
April 1, 2012
Restricted shares	1,522	$	19.30
Performance stock units	350	$	17.77
March 31, 2013
Restricted shares	1,802	$	20.24
Performance stock units	350	$	21.62

XML

RESTRUCTURING CHARGES AND SEVERANCE CHARGES - Restructuring Activities and Accrued Liabilities in the Consolidated Balance Sheets (Details) (Other Facilities, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 2,314
Provisions	7,228
Cash expenditures	(5,379)
Other non-cash settlement	(204)
Ending Balance	3,959
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2,124
Provisions	7,098
Cash expenditures	(5,146)
Other non-cash settlement	(201)
Ending Balance	3,875
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	190
Provisions	103
Cash expenditures	(206)
Other non-cash settlement	(3)
Ending Balance	84
Other Associated Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Provisions	27
Cash expenditures	(27)
Other non-cash settlement	0
Ending Balance	$ 0

XML

SEGMENT INFORMATION - Long Lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 117,700	$ 116,146
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	94,282	93,496
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	13,254	13,253
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	8,768	7,912
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment	$ 1,396	$ 1,485

XML

ACCRUED LIABILITIES

6 Months Ended

Mar. 31, 2013

Accounts Payable and Accrued Liabilities, Current [Abstract]

ACCRUED LIABILITIES

ACCRUED LIABILITIES

Accrued liabilities consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Payroll and benefits	$	23,246	$	43,219
Outside services	12,563		11,826
Restructuring and severance	8,737		8,277
Income taxes	3,475		1,036
Licenses	3,107		1,688
Warranties	2,686		2,472
Deferred revenue	2,385		1,566
Commissions	2,352		2,900
Interest	1,594		1,720
Other	5,454		5,520
	$	65,599	$	80,224

XML

COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended	12 Months Ended
	Nov. 30, 1998	Mar. 31, 2013	Sep. 28, 2003	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Reimbursements for past costs	$ 0.5
Future clean-up costs sharing percentage	90.00%
Total estimated environment remediation cost up to the year 2020		5.3
Charges for environmental remediation costs			0.5
Accrued workers' compensation liabilities		$ 1.5		$ 1.4
Filing complaint date		December 8, 2010

XML

INVENTORIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 37,998	$ 39,094
Work in progress	92,407	90,920
Finished goods	32,322	29,041
Inventories, net	$ 162,727	$ 159,055

XML

PRESENTATION OF FINANCIAL INFORMATION - Additional Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock awards excluded in computation of diluted EPS	4.9
Prior period reclassification adjustment		$ 0.4

XML

GOODWILL AND INTANGIBLE ASSETS, NET (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	$ 357,173	$ 399,991
Goodwill	790,236	790,236
Completed technology
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	171,470	191,007
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	183,795	205,145
Backlog
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	0	627
Others
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	$ 1,908	$ 3,212

XML

GOODWILL AND INTANGIBLE ASSETS, NET - Estimated Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense, Year 1	$ 82,860
Amortization expense, Year 2	76,049
Amortization expense, Year 3	70,649
Amortization expense, Year 4	68,170
Amortization expense, Year 5	46,634
Thereafter	$ 12,811

XML

GOODWILL AND INTANGIBLE ASSETS, NET

6 Months Ended

Mar. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS, NET

GOODWILL AND INTANGIBLE ASSETS, NET

Goodwill and intangible assets, net consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Amortizable intangible assets
Completed technology	$	171,470	$	191,007
Customer relationships	183,795		205,145
Backlog	—		627
Other	1,908		3,212
	$	357,173	$	399,991
Non-amortizing intangible assets
Goodwill	790,236		790,236

Estimated amortization expense in each of the five succeeding years and thereafter is as follows (amounts in thousands):

	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter
Amortization expense	$	82,860	$	76,049	$	70,649	$	68,170	$	46,634	$	12,811

XML

ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and benefits	$ 23,246	$ 43,219
Outside services	12,563	11,826
Restructuring and severance	8,737	8,277
Income taxes	3,475	1,036
Licenses	3,107	1,688
Warranties	2,686	2,472
Deferred revenue	2,385	1,566
Commissions	2,352	2,900
Interest	1,594	1,720
Other	5,454	5,520
Accrued liabilities	$ 65,599	$ 80,224

XML

RESTRUCTURING CHARGES AND SEVERANCE CHARGES - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Scottsdale Facility	Sep. 30, 2012 Scottsdale Facility	Apr. 03, 2011 Scottsdale Facility sqft	Mar. 31, 2013 Scottsdale Facility Employee Severance	Sep. 30, 2012 Scottsdale Facility Employee Severance	Mar. 31, 2013 Other Facilities	Sep. 30, 2012 Other Facilities	Mar. 31, 2013 Other Facilities Employee Severance Person	Sep. 30, 2012 Other Facilities Employee Severance	Mar. 31, 2013 Other Facilities Contract Termination Costs	Sep. 30, 2012 Other Facilities Contract Termination Costs
Schedule of Status of Facilities by Location [Line Items]
Occupied leased facility (square foot)							135,000
Recorded severance accruals					$ 5,069	$ 5,965		$ 0	$ 117	$ 3,959	$ 2,314	$ 3,875	$ 2,124	$ 84	$ 190
Restructuring and severance charges	$ 6,261	$ 119	$ 7,111	$ 7,344								$ 7,200
Number of employees												120

XML

CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 206,921	$ 204,335
Accounts receivable, net of allowance for doubtful accounts of $1,475 at March 31, 2013 and $1,623 at September 30, 2012	158,403	153,190
Inventories, net	162,727	159,055
Deferred income taxes, net	20,361	20,361
Other current assets	29,599	24,400
Total current assets	578,011	561,341
Property and equipment, net	117,700	116,146
Goodwill	790,236	790,236
Intangible assets, net	357,173	399,991
Deferred income taxes, net	30,691	33,066
Other assets	29,737	33,850
TOTAL ASSETS	1,903,548	1,934,630
Current liabilities:
Accounts payable	70,232	75,351
Accrued liabilities	65,599	80,224
Current maturity of long-term liabilities	1,070	903
Total current liabilities	136,901	156,478
Credit facility	725,975	775,975
Deferred income taxes	25,107	25,135
Other long-term liabilities	46,629	49,056
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $1.00 par value; authorized 1,000 shares; none issued	0	0
Common stock, $0.20 par value; 250,000 authorized, 92,855 issued and outstanding at March 31, 2013 and 90,282 issued and outstanding at September 30, 2012	18,571	18,056
Capital in excess of par value of common stock	707,852	678,905
Retained earnings	243,077	231,768
Accumulated other comprehensive income (loss)	(564)	(743)
Total stockholders' equity	968,936	927,986
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,903,548	$ 1,934,630

XML

PRESENTATION OF FINANCIAL INFORMATION

6 Months Ended

Mar. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

PRESENTATION OF FINANCIAL INFORMATION

PRESENTATION OF FINANCIAL INFORMATION

The unaudited consolidated financial statements include the accounts of Microsemi Corporation and its subsidiaries. Intercompany transactions have been eliminated in consolidation.

The consolidated financial information furnished herein is unaudited, but in the opinion of our management, includes all adjustments (all of which are normal or recurring adjustments) necessary for a fair statement of the results of operations for the periods indicated. The results of operations for the most recently reported quarter and first six months of the current fiscal year are not necessarily indicative of the results to be expected for the full year.

The unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q, and therefore do not include all information and note disclosures necessary for a fair presentation of consolidated financial position, results of operations and cash flows in conformity with United States generally accepted accounting principles. The unaudited consolidated financial statements and notes thereto must be read in their entirety in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

The unaudited consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, which require us to make estimates and assumptions that may materially affect the reported amounts of assets and liabilities at the date of the unaudited consolidated financial statements and revenues and expenses during the periods reported. Actual results could differ materially from those estimates. Information with respect to our critical accounting policies that we believe could have the most significant effect on our reported results and require subjective or complex judgments is contained in the notes to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012. In referencing a year, we are referring to the fiscal year ended on the Sunday closest to September 30.

Earnings Per Share

Basic earnings per share have been computed based upon the weighted-average number of common shares outstanding during the respective periods. Diluted earnings per share have been computed, when the result is dilutive, using the treasury stock method for stock awards outstanding during the respective periods. Earnings per share were calculated as follows (amounts in thousands, except per share data):

	Quarter Ended						Six Months Ended
	March 31, 2013			April 1, 2012			March 31, 2013		April 1, 2012
Basic
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding	89,405			85,645			88,970		85,435
Basic earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.13	$	(0.58	)
Diluted
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding for basic	89,405			85,645			88,970		85,435
Dilutive effect of stock awards	—			—			1,568		—
Weighted-average common shares outstanding on a diluted basis	89,405			85,645			90,538		85,435
Diluted earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.12	$	(0.58	)

For the six months ended March 31, 2013, we excluded 4.9 million stock awards in the computation of diluted EPS as these stock awards would have been anti-dilutive. For the quarter ended March 31, 2013 and quarter and six months ended April 1, 2012, all stock awards were excluded as we reported a net loss in these periods.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

Revision to Prior Year Consolidated Statement of Cash Flows 

During 2013, we revised our consolidated statement of cash flows to correct for an error in our 2012 presentation of excess tax benefits on stock awards. The correction resulted in an increase in cash flows from operating activities for the quarter ended January 1, 2012 of $0.4 million and a corresponding decrease in cash flows from financing activities for the same amount. The revision had no impact on our total cash flows or cash and cash equivalents.

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2011-11, the objective of which is to provide additional disclosures on the effect or potential effect of rights of setoff associated with an entity's recognized assets and recognized liabilities within the scope of the update. The update primarily impacts financial instruments and derivatives subject to a master netting arrangement or similar agreement. ASU No. 2011-11 is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. We are currently assessing the disclosures required under this ASU.

In February 2013, the FASB issued ASU No. 2013-04, the objective of which is to provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The guidance in the update requires that these arrangements be recorded as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors. ASU 2013-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. We are currently assessing the impact of this ASU on our consolidated financial position and results of operations.

XML

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 206,921	$ 204,335
Pension plan assets	5,480	5,382
Interest rate swap liabilities	1,283	1,950
Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	206,921	204,335
Pension plan assets	0	0
Interest rate swap liabilities	0	0
Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Pension plan assets	0	0
Interest rate swap liabilities	1,283	1,950
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Pension plan assets	5,480	5,382
Interest rate swap liabilities	$ 0	$ 0

XML

CREDIT AGREEMENT AND RELATED INSTRUMENTS Credit (Tables)

6 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Interest Rate Margin on Debt

The applicable interest rate margin per annum for each type of loan at March 31, 2013 is as follows:

	Base Rate	Eurodollar Rate
Revolving and swingline loans	3.50%	4.50%
Term loans	1.75%	2.75%

XML

SEGMENT INFORMATION - Net Sales by the Originating Geographic Area and Estimated End Market (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Segment Reporting Disclosure [Line Items]
Net Sales	$ 235,333	$ 249,306	$ 482,931	$ 490,226
Communication
Segment Reporting Disclosure [Line Items]
Net Sales	64,383	77,231	141,121	152,355
Defense And Security
Segment Reporting Disclosure [Line Items]
Net Sales	79,445	71,466	155,067	140,581
Aerospace
Segment Reporting Disclosure [Line Items]
Net Sales	44,185	52,879	92,409	102,002
Industrial
Segment Reporting Disclosure [Line Items]
Net Sales	47,320	47,730	94,334	95,288
United States
Segment Reporting Disclosure [Line Items]
Net Sales	134,486	126,471	255,214	244,218
Europe
Segment Reporting Disclosure [Line Items]
Net Sales	31,735	40,045	72,164	88,348
Asia
Segment Reporting Disclosure [Line Items]
Net Sales	64,051	76,465	145,716	145,877
Customers with ship-to location in Hong Kong as a percentage of consolidated net sales		10.80%		11.40%
Other
Segment Reporting Disclosure [Line Items]
Net Sales	$ 5,061	$ 6,325	$ 9,837	$ 11,783

XML

SEGMENT INFORMATION (Tables)

6 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Net Sales, End Market and Long Lived Assets by Geographic Area

Net sales by geographic area based on a customer's ship-to location and by estimated end market are as follows (amounts in thousands):

	Quarter Ended				Six Months Ended
	March 31, 2013		April 1, 2012		March 31, 2013		April 1, 2012
Net Sales:
United States	$	134,486	$	126,471	$	255,214	$	244,218
Europe	31,735		40,045		72,164		88,348
Asia	64,051		76,465		145,716		145,877
Other	5,061		6,325		9,837		11,783
Total	$	235,333	$	249,306	$	482,931	$	490,226
Communications	$	64,383	$	77,231	$	141,121	$	152,355
Defense & Security	79,445		71,466		155,067		140,581
Aerospace	44,185		52,879		92,409		102,002
Industrial	47,320		47,730		94,334		95,288
Total	$	235,333	$	249,306	$	482,931	$	490,226

Property and equipment, net by geographic area are as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
United States	$	94,282	$	93,496
Europe	13,254		13,253
Asia	8,768		7,912
Other	1,396		1,485
Total	$	117,700	$	116,146

XML

INVENTORIES

6 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

INVENTORIES

INVENTORIES

Inventories are summarized as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
Raw materials	$	37,998	$	39,094
Work in progress	92,407		90,920
Finished goods	32,322		29,041
	$	162,727	$	159,055

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,475	$ 1,623
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.20	$ 0.20
Common stock, authorized	250,000,000	250,000,000
Common stock, issued	92,855,000	90,282,000
Common stock, outstanding	92,855,000	90,282,000

XML

PRESENTATION OF FINANCIAL INFORMATION (Policies)

6 Months Ended

Mar. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Earnings Per Share

Earnings Per Share

Basic earnings per share have been computed based upon the weighted-average number of common shares outstanding during the respective periods. Diluted earnings per share have been computed, when the result is dilutive, using the treasury stock method for stock awards outstanding during the respective periods.

Revision to Prior Year Consolidated Statement of Cash Flows

Revision to Prior Year Consolidated Statement of Cash Flows 

During 2013, we revised our consolidated statement of cash flows to correct for an error in our 2012 presentation of excess tax benefits on stock awards. The correction resulted in an increase in cash flows from operating activities for the quarter ended January 1, 2012 of $0.4 million and a corresponding decrease in cash flows from financing activities for the same amount. The revision had no impact on our total cash flows or cash and cash equivalents.

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2011-11, the objective of which is to provide additional disclosures on the effect or potential effect of rights of setoff associated with an entity's recognized assets and recognized liabilities within the scope of the update. The update primarily impacts financial instruments and derivatives subject to a master netting arrangement or similar agreement. ASU No. 2011-11 is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. We are currently assessing the disclosures required under this ASU.

XML

DOCUMENT AND ENTITY INFORMATION	6 Months Ended
	Mar. 31, 2013	Apr. 16, 2013
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	MSCC
Entity Registrant Name	MICROSEMI CORP
Entity Central Index Key	0000310568
Current Fiscal Year End Date	--09-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		92,913,870

XML

PRESENTATION OF FINANCIAL INFORMATION (Tables)

6 Months Ended

Mar. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Earnings Per Share

Basic earnings per share have been computed based upon the weighted-average number of common shares outstanding during the respective periods. Diluted earnings per share have been computed, when the result is dilutive, using the treasury stock method for stock awards outstanding during the respective periods. Earnings per share were calculated as follows (amounts in thousands, except per share data):

	Quarter Ended						Six Months Ended
	March 31, 2013			April 1, 2012			March 31, 2013		April 1, 2012
Basic
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding	89,405			85,645			88,970		85,435
Basic earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.13	$	(0.58	)
Diluted
Net income (loss)	$	(2,905	)	$	(4,792	)	$	11,309	$	(49,394	)
Weighted-average common shares outstanding for basic	89,405			85,645			88,970		85,435
Dilutive effect of stock awards	—			—			1,568		—
Weighted-average common shares outstanding on a diluted basis	89,405			85,645			90,538		85,435
Diluted earnings (loss) per share	$	(0.03	)	$	(0.06	)	$	0.12	$	(0.58	)

XML

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Income Statement [Abstract]
Net sales	$ 235,333	$ 249,306	$ 482,931	$ 490,226
Cost of sales	101,868	117,438	206,893	232,622
Gross profit	133,465	131,868	276,038	257,604
Operating expenses:
Selling, general and administrative	52,316	51,971	103,669	106,687
Research and development costs	41,956	42,188	85,132	81,789
Amortization of intangible assets	21,110	26,472	42,820	51,334
Restructuring and severance charges	6,261	119	7,111	7,344
Total operating expenses	121,643	120,750	238,732	247,154
Operating income (loss)	11,822	11,118	37,306	10,450
Other income (expenses):
Interest expense, net	(7,744)	(10,194)	(16,105)	(22,033)
Other, net	(3,603)	(1,035)	(3,549)	(33,439)
Total other expense	(11,347)	(11,229)	(19,654)	(55,472)
Income (loss) before income taxes	475	(111)	17,652	(45,022)
Provision for income taxes	3,380	4,681	6,343	4,372
Net income (loss)	(2,905)	(4,792)	11,309	(49,394)
Earnings (loss) per share:
Basic	$ (0.03)	$ (0.06)	$ 0.13	$ (0.58)
Diluted	$ (0.03)	$ (0.06)	$ 0.12	$ (0.58)
Weighted-average common shares outstanding:
Basic	89,405	85,645	88,970	85,435
Diluted	89,405	85,645	90,538	85,435
Other comprehensive income (loss), net of tax:
Translation adjustment, net of tax	(7)	(176)	179	(115)
Unrealized actuarial loss on pension benefits, net of tax	(42)	0	(86)	0
Other comprehensive income (loss)	(49)	(176)	93	(115)
Total comprehensive income (loss)	$ (2,954)	$ (4,968)	$ 11,402	$ (49,509)

XML

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

6 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. Accounting Standards Codification ("ASC") 820 establishes a hierarchy for ranking the quality and reliability of the information used to determine fair values and includes the following classifications:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following financial assets and liabilities were measured at fair value on a recurring basis using the type of inputs shown:

	Fair Value Measurements Using:
	Total		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
September 30, 2012
Cash and cash equivalents	$	204,335	$	204,335	$	—	—
Pension plan assets	$	5,382	$	—	$	—	$	5,382
Interest rate swap liabilities	$	1,950	$	—	$	1,950	$	—
March 31, 2013
Cash and cash equivalents	$	206,921	$	206,921	$	—	$	—
Pension plan assets	$	5,480	$	—	$	—	$	5,480
Interest rate swap liabilities	$	1,283	$	—	$	1,283	$	—

Pension plan assets are insurance contracts with insurance payments guaranteed by the insurer and the security fund for insurance companies in Germany. There were no transfers of financial assets or liabilities between the classifications during the periods reported.

XML

CREDIT AGREEMENT AND RELATED INSTRUMENTS

6 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

CREDIT AGREEMENT AND RELATED INSTRUMENTS

CREDIT AGREEMENT AND RELATED INSTRUMENTS

Credit Agreement

We are a party to a senior secured credit facility with Morgan Stanley Senior Funding, Inc. ("MSSF") consisting of a term loan facility and a $50.0 million revolving credit facility. As of March 31, 2013, we had $726.0 million in term loan borrowings and no borrowings under the revolving credit facility. We can also request the establishment of one or more swingline loans and/or revolving credit facilities with commitments in an aggregate amount not to exceed $200.0 million.

During the quarter ended March 31, 2013, we entered into Amendment No. 4 to our Credit Agreement dated as of November 2, 2010 with MSSF and the lenders referred to therein (as amended, the “Credit Agreement”). The amendment extended the term loan maturity date, provided new pricing terms and modified certain financial covenant provisions such that they are not scheduled to be reported unless we have revolving or swingline loan balances outstanding at the end of a fiscal quarter. We accounted for the fourth amendment as a debt modification with respect to amounts that remained in the syndicate and a debt extinguishment with respect to the $277.5 million that exited the syndicate and recorded debt extinguishment expense of $3.0 million. The amendment did not impact the net principal balance outstanding.

Under the Credit Agreement, we may borrow under a "Base Rate" or "Eurodollar Rate". The “Base Rate” is defined as a rate per annum equal to the greatest of (a) the prime rate, (b) 1/2 of 1% per annum above the federal funds effective rate, (c) the one-month Eurodollar Rate plus 1%, and (d) in the case of any term loans, 2.00%. The “Eurodollar Rate” is defined as (a) the rate per annum offered for deposits of dollars for the applicable interest period that appears on Reuters Screen LIBOR01 Page as of 11:00 A.M., London, England time, two business days prior to the first day of such interest period or (b) if no such offered rate exists, such rate will be the rate of interest per annum as determined by the administrative agent (rounded upwards, if necessary, to the nearest 1/100 of 1%) at which deposits of dollars in immediately available funds are offered at 11:00 A.M., London, England time, two business days prior to the first day in the applicable interest period by major financial institutions reasonably satisfactory to the administrative agent in the London interbank market for such interest period and for an amount equal or comparable to the principal amount of the loans to be borrowed, converted or continued as Eurodollar Rate loans on such date of determination. In the case of term loans, the Eurodollar Rate will not be lower than 1.00%.

The applicable interest rate margin per annum for each type of loan at March 31, 2013 is as follows:

	Base Rate	Eurodollar Rate
Revolving and swingline loans	3.50%	4.50%
Term loans	1.75%	2.75%

As of March 31, 2013, term loan borrowings were under the Eurodollar Rate and subject to an interest rate of 3.75%. The fair value of our term loan balance was $731.4 million based on a market quote provided to us by MSSF.

The amended term loan facility matures in February 2020 and principal amortizes at $7.3 million per year. During the six months ended March 31, 2013, we completed optional principal prepayments of $50.0 million. Subsequent to March 31, 2013, we completed an additional optional principal prepayment of $27.0 million. While there are currently no scheduled principal repayments until the maturity date, the Credit Agreement stipulates an annual payment of a percentage of Excess Cash Flow ("ECF"). The ECF percentage is between 0% and 50% depending on our consolidated leverage ratio as of the end of a fiscal year.

We currently pay an undrawn commitment fee of 0.375% on the unused portion of the revolving facility. If any letters of credit are issued, then we expect to pay a fronting fee equal to 0.25% per annum of the aggregate face amount of each letter of credit and a participation fee on all outstanding letters of credit at a per annum rate equal to the margin then in effect with respect to Eurodollar Rate-based loans on the face amount of such letter of credit.

The Credit Agreement includes financial covenants requiring a maximum leverage ratio and minimum fixed charge coverage ratio that are applicable only when revolving loans or swingline loans are outstanding at the end of a fiscal quarter and also contains other customary affirmative and negative covenants and events of default. We were in compliance with our covenants as of March 31, 2013.

Interest Rate Swap Agreements

In connection with the original Credit Agreement, in 2011, we entered into interest rate swap agreements for the purpose of minimizing the variability of cash flows in the interest rate payments of our variable rate borrowings. The cash flows received under the interest rate swap agreements are expected to offset the change in cash flows associated with LIBOR rate borrowings between the effective and maturity dates of the swaps. Our two outstanding swap agreements have notional amounts, fixed rates and expiration dates as follows: $121.0 million at 1.83% expiring January 2014 and $24.0 million at 2.21% expiring January 2015. We classify our interest rate swap balances as Level 2 fair value measurements. We determined the fair value of our interest rate swap agreements based on mid-market valuations reported to us by the counterparty to the swap agreements. Related to these interest rate swap agreements, we recorded a current liability of $0.8 million and a long-term liability of $0.5 million as of March 31, 2013 and a long-term liability of $1.9 million as of September 30, 2012. We reflect the change in fair value of the swaps through other income (expense), net and recorded income of $0.7 million in the first six months of 2013 and income of $0.2 million in the first six months of 2012.

XML

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Tables)

6 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following financial assets and liabilities were measured at fair value on a recurring basis using the type of inputs shown:

	Fair Value Measurements Using:
	Total		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
September 30, 2012
Cash and cash equivalents	$	204,335	$	204,335	$	—	—
Pension plan assets	$	5,382	$	—	$	—	$	5,382
Interest rate swap liabilities	$	1,950	$	—	$	1,950	$	—
March 31, 2013
Cash and cash equivalents	$	206,921	$	206,921	$	—	$	—
Pension plan assets	$	5,480	$	—	$	—	$	5,480
Interest rate swap liabilities	$	1,283	$	—	$	1,283	$	—

XML

INVENTORIES (Tables)

6 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories are summarized as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
Raw materials	$	37,998	$	39,094
Work in progress	92,407		90,920
Finished goods	32,322		29,041
	$	162,727	$	159,055

XML

RESTRUCTURING CHARGES AND SEVERANCE CHARGES

6 Months Ended

Mar. 31, 2013

Restructuring and Related Activities [Abstract]

RESTRUCTURING CHARGES AND SEVERANCE CHARGES

RESTRUCTURING CHARGES AND SEVERANCE CHARGES

In 2009, we approved consolidation plans that resulted in the closure of our manufacturing facility in Scottsdale, Arizona (“Scottsdale”), which ceased production during the quarter ended April 3, 2011. The Scottsdale facility occupied a 135,000 square foot leased facility. For Scottsdale, contract termination costs relate primarily to the remaining obligations under facility and equipment leases and are expected to be paid through 2016. The following table reflects the restructuring activities for the Scottsdale facility and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Total
Balance at September 30, 2012	$	117		$	5,848		$	5,965
Reversal of prior provision	(117		)	—			(117		)
Cash expenditures	—			(779		)	(779		)
Balance at March 31, 2013	$	—		$	5,069		$	5,069

At September 30, 2012, we had recorded severance and restructuring accruals of $2.3 million from reductions in force at our various facilities other than Scottsdale. We recorded additional provisions for severance totaling $7.2 million for the six months ended March 31, 2013. Provisions for severance in the six months ended March 31, 2013 covered approximately 120 individuals in manufacturing, engineering and sales. Employee severance is expected to be paid within the next twelve months. Contract termination costs relate primarily to remaining obligations under facility leases and are expected to be paid through 2020. Other associated costs related primarily to relocation costs that we incurred for the consolidation of several facilities in Northern California. The following table reflects the related restructuring activities and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Other Associated Costs			Total
Balance at September 30, 2012	$	2,124		$	190		$	—		$	2,314
Provisions	7,098			103			27			7,228
Cash expenditures	(5,146		)	(206		)	(27		)	(5,379		)
Other non-cash settlement	(201		)	(3		)	—			(204		)
Balance at March 31, 2013	$	3,875		$	84		$	—		$	3,959

XML

SEGMENT INFORMATION

6 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

We manage our business on the basis of one reportable segment, as a manufacturer of semiconductors in different geographic areas, including the United States, Europe and Asia. We derive revenue from sales of our high-performance analog/mixed-signal integrated circuits and power and high-reliability individual component semiconductors. These products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance, reliability and battery optimization, reducing size or protecting circuits. The principal markets that we serve include Communications, Defense & Security, Aerospace and Industrial. We evaluate sales by end-market based on our understanding of end market uses of our products.

Net sales by geographic area based on a customer's ship-to location and by estimated end market are as follows (amounts in thousands):

	Quarter Ended				Six Months Ended
	March 31, 2013		April 1, 2012		March 31, 2013		April 1, 2012
Net Sales:
United States	$	134,486	$	126,471	$	255,214	$	244,218
Europe	31,735		40,045		72,164		88,348
Asia	64,051		76,465		145,716		145,877
Other	5,061		6,325		9,837		11,783
Total	$	235,333	$	249,306	$	482,931	$	490,226
Communications	$	64,383	$	77,231	$	141,121	$	152,355
Defense & Security	79,445		71,466		155,067		140,581
Aerospace	44,185		52,879		92,409		102,002
Industrial	47,320		47,730		94,334		95,288
Total	$	235,333	$	249,306	$	482,931	$	490,226

As a percentage of consolidated net sales, customers with a ship-to location in Hong Kong totaled 10.8% and 11.4% for the quarter and six months ended April 1, 2012, respectively. We began reporting net sales by geographic area based on a customer's ship-to location in the second quarter of 2013 and prior year amounts have been adjusted to conform to current year presentation.     

Property and equipment, net by geographic area are as follows (amounts in thousands):

	March 31, 2013		September 30, 2012
United States	$	94,282	$	93,496
Europe	13,254		13,253
Asia	8,768		7,912
Other	1,396		1,485
Total	$	117,700	$	116,146

XML

STOCK-BASED COMPENSATION

6 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

Stock Based Compensation

In January 2012, our stockholders approved an amendment to the Microsemi Corporation 2008 Performance Incentive Plan (the “2008 Plan”). The amendment a) increased the share limit by an additional 14.5 million shares so that the amended aggregate share limit for the 2008 Plan is 28.5 million shares; b) extended the plan term to December 5, 2021; c) increased the number of shares counted against the share limit for every one share issued in connection with a full-value award to 2.41; d) terminated the evergreen provision in the original plan; and e) extended the Performance-Based Award feature through the first annual meeting of stockholders that occurs in calendar year 2017. Awards authorized by the 2008 Plan include options, stock appreciation rights, restricted stock, stock bonuses, stock units, performance share awards, and other cash- or share-based awards. The shares issued under the 2008 Plan may be newly issued or shares held by the Company as treasury stock. The maximum term of a stock option grant or a stock appreciation right granted under the 2008 Plan is 6 years. For the quarter and six months ended March 31, 2013, stock-based compensation expense decreased operating income by $10.2 million and $18.3 million, respectively. For the quarter and six months ended April 1, 2012, stock-based compensation expense decreased operating income by $10.0 million and $17.6 million, respectively.

The quantity of restricted shares and performance stock units at target levels and their weighted-average fair value are as follows (quantity in thousands):

Six Months Ended	Quantity	Fair Value per Award
April 1, 2012
Restricted shares	1,522	$	19.30
Performance stock units	350	$	17.77
March 31, 2013
Restricted shares	1,802	$	20.24
Performance stock units	350	$	21.62

Restricted Shares

Compensation expense for restricted shares was calculated based on the closing price of our common stock on the date of grant and are subject to forfeiture if a participant does not meet length of service requirements. Restricted stock awards granted to employees typically vest over a three year period and awards granted to non-employee directors vest in accordance with our director compensation policy.

Performance Stock Units

Performance stock units granted in 2012 will vest based on the Company's growth in net sales and earnings per share (subject to certain adjustments) for 2012 and 2013 in comparison with the growth in net sales and adjusted earnings per share over the same period for a peer group selected by the Compensation Committee. For these performance stock units, 50% of each performance-based award opportunity will be subject to the net sales metric for the performance period and 50% will be subject to the earnings per share metric for the performance period.

Performance stock units granted in 2013 will vest based on the Company achieving net sales and earnings per share (subject to certain adjustments) levels for 2013, 2014 and 2015. For these performance stock units, 25% of each performance-based award opportunity will be subject to the net sales metric for the performance period and 75% will be subject to the earnings per share metric for the performance period.

Compensation expense is based upon either our estimate of performance relative to a peer group for the 2012 grant and our expected performance over the performance period for the 2013 grant. The maximum percentage for a particular metric is 200% of the “target” number of units subject to the award related to that metric. For performance stock units granted in 2013, the maximum percentage is further adjusted by the Company's total shareholder return relative to a peer group selected by the Compensation Committee, up to a maximum of 125%.

XML

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

In Broomfield, Colorado, the owner of a property located adjacent to a manufacturing facility owned by one of our subsidiaries, Microsemi Corp. – Colorado had notified the subsidiary and other parties of a claim that contaminants migrated to his property, thereby diminishing its value. In August 1995, the subsidiary, together with Coors Porcelain Company, FMC Corporation and Siemens Microelectronics, Inc. (former owners of the manufacturing facility), agreed to settle the claim and to indemnify the owner of the adjacent property for remediation costs. Although tricholorethylene and other contaminants previously used by former owners at the facility are present in soil and groundwater on the subsidiary’s property, we vigorously contest any assertion that the subsidiary caused the contamination. In November 1998, we signed an agreement with the three former owners of this facility whereby they have 1) reimbursed us for $0.5 million of past costs, 2) assumed responsibility for 90% of all future clean-up costs, and 3) promised to indemnify and protect us against any and all third-party claims relating to the contamination of the facility. An Integrated Corrective Action Plan was submitted to the State of Colorado. Sampling and management plans were prepared for the Colorado Department of Public Health & Environment. State and local agencies in Colorado are reviewing current data and considering study and cleanup options. The most recent forecast estimated that the total project cost, up to the year 2020, would be approximately $5.3 million; accordingly, we recorded a one-time charge of $0.5 million for this project in 2003. There has not been any significant development since 2003.

We are generally self-insured for losses and liabilities related to workers’ compensation and employer’s liability insurance. Accrued workers’ compensation liability was $1.5 million and $1.4 million at March 31, 2013 and September 30, 2012, respectively. Our self-insurance accruals are based on estimates and, while we believe that the amounts accrued are adequate, the ultimate claims may be in excess of the amounts provided.

On December 8, 2010, Intellectual Ventures I LLC and Intellectual Ventures II LLC filed a complaint in the United States District Court for the District of Delaware against Altera Corporation, Microsemi, and Lattice Semiconductor Corporation. On February 15, 2011, the plaintiffs filed an amended complaint adding Xilinx, Inc. as a defendant. The complaint alleges, inter alia, that programmable logic devices manufactured and sold by our subsidiary Microsemi – SoC infringe United States Patent Numbers 5,687,325, 6,260,087 and 6,272,646 assigned to Intellectual Ventures II LLC, and seeks damages and other relief at law or in equity as the court deems appropriate. In January 2013, the parties settled this matter as it pertains to Microsemi and the action against us was dismissed by the court. The resolution of this matter did not have a material adverse effect on our financial position, results of operations or cash flows.

We are also involved in other pending litigation matters arising out of the normal conduct of our business, including litigation relating to acquisitions, employment matters, commercial transactions, contracts, environmental matters and matters related to compliance with governmental regulations. The ultimate aggregate amount of monetary liability or financial impact with respect to these matters is subject to many uncertainties and is therefore not predictable with assurance. In the opinion of management, the final outcome of these matters, if they are adverse, will not have a material adverse effect on our financial position, results of operations or cash flows. However, there can be no assurance with respect to such result, and monetary liability or financial impact on us from these litigation matters could differ materially from those projected.

XML

CREDIT AGREEMENT AND RELATED INSTRUMENTS (Details) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended													3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Interest Rate Swap	Apr. 01, 2012 Interest Rate Swap	Oct. 02, 2011 Interest Rate Swap	Mar. 31, 2013 Interest Rate Swap Group 1	Mar. 31, 2013 Interest Rate Swap Group 2	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum	Mar. 31, 2013 Revolving and swingline loans	Mar. 31, 2013 Revolving and swingline loans Base Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Eurodollar Amended and Restated Credit Agreement	Mar. 31, 2013 Term loans	Mar. 31, 2013 Term loans Base Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Term loans Eurodollar Amended and Restated Credit Agreement	Mar. 31, 2013 Term loans Minimum Eurodollar	Mar. 31, 2013 Letter of Credit	Mar. 31, 2013 Revolving and swingline loans	Mar. 31, 2013 Revolving and swingline loans Eurodollar Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Prime Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Federal Funds Effective Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Eurodollar, One Month Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Face amount																				$ 50,000,000
Borrowed under term loan facility												0			726,000,000
Maximum amount allowed to be requested for a loan or revolving credit facility		200,000,000	200,000,000
Payments of debt extinguishment costs			277,539,000	470,296,000
Debt extinguishment expense		3,000,000
Description of variable rate basis																					eurodollar	prime rate	federal funds effective rate	one-month Eurodollar rate
Amount rounded up to nearest percentage of rate determined by agent		0.01%
Term loan borrowings effective rate under Eurodollar rate		3.75%	3.75%
Debt instrument, interest rate margin													3.50%	4.50%		1.75%	2.75%						0.50%	1.00%
Debt, stated rate																2.00%		1.00%
Fair value outstanding term loan															731,400,000
Maturity date			Feb. 19, 2020
Debt instrument, annual principal payment		7,300,000	7,300,000
Optional principal prepayment	27,000,000		50,000,000
Excess Cash Flow (ECF) percentage										0.00%	50.00%
Undrawn commitment fee percentage			0.375%
Fronting fee on letters of credit																			0.0025
Number of derivative agreements					2
Notional amount								121,000,000	24,000,000
Fixed rate								1.83%	2.21%
Derivative maturity period								Jan. 06, 2014	Jan. 05, 2015
Current liability related to interest rate swap agreements					800,000
Long-term liability related to interest rate swap agreements					500,000		1,900,000
Gain on interest rate swaps					700,000
Loss on interest rate swaps						$ 200,000

XML

ACCRUED LIABILITIES (Tables)

6 Months Ended

Mar. 31, 2013

Accounts Payable and Accrued Liabilities, Current [Abstract]

Components of Accrued Liabilities

Accrued liabilities consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Payroll and benefits	$	23,246	$	43,219
Outside services	12,563		11,826
Restructuring and severance	8,737		8,277
Income taxes	3,475		1,036
Licenses	3,107		1,688
Warranties	2,686		2,472
Deferred revenue	2,385		1,566
Commissions	2,352		2,900
Interest	1,594		1,720
Other	5,454		5,520
	$	65,599	$	80,224

XML

RESTRUCTURING CHARGES AND SEVERANCE CHARGES (Tables)

6 Months Ended

Mar. 31, 2013

Scottsdale Facility

Reflects the restructuring activities and the accrued liabilities

The following table reflects the restructuring activities for the Scottsdale facility and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Total
Balance at September 30, 2012	$	117		$	5,848		$	5,965
Reversal of prior provision	(117		)	—			(117		)
Cash expenditures	—			(779		)	(779		)
Balance at March 31, 2013	$	—		$	5,069		$	5,069

Other Facilities

Reflects the restructuring activities and the accrued liabilities

The following table reflects the related restructuring activities and the accrued liabilities in the consolidated balance sheets at the dates below (amounts in thousands):

	Employee Severance			Contract Termination Costs			Other Associated Costs			Total
Balance at September 30, 2012	$	2,124		$	190		$	—		$	2,314
Provisions	7,098			103			27			7,228
Cash expenditures	(5,146		)	(206		)	(27		)	(5,379		)
Other non-cash settlement	(201		)	(3		)	—			(204		)
Balance at March 31, 2013	$	3,875		$	84		$	—		$	3,959

XML

RESTRUCTURING CHARGES AND SEVERANCE CHARGES - Restructuring Activities for Scottsdale Facility and the Accrued Liabilities in the Consolidated Balance Sheets (Details) (Scottsdale Facility, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 5,965
Reversal of prior provision	(117)
Cash expenditures	(779)
Ending Balance	5,069
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	117
Reversal of prior provision	(117)
Cash expenditures	0
Ending Balance	0
Facility Termination Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	5,848
Reversal of prior provision	0
Cash expenditures	(779)
Ending Balance	$ 5,069

XML

CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Cash flows from operating activities:
Net income (loss)	$ 11,309	$ (49,394)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,385	68,302
Provision for doubtful accounts	(148)	(284)
Amortization of deferred financing costs	596	1,528
Settlement of foreign currency forward	0	(3,701)
Loss on disposition or impairment of assets	0	1,513
Deferred income taxes	2,347	(997)
Charge for stock based compensation	18,278	17,577
Effect of credit facility issuance and refinancing costs	2,615	29,275
Change in assets and liabilities (net of acquisitions and disposition):
Accounts receivable	(5,065)	(15,251)
Inventories	(3,672)	15,641
Other current assets	(5,198)	32,601
Other assets	1,751	(7,509)
Accounts payable	(3,713)	5,084
Accrued liabilities	(14,161)	(56,263)
Other long-term liabilities	(2,275)	23,172
Net cash provided by operating activities	60,049	61,294
Cash flows from investing activities:
Purchases of property and equipment	(17,560)	(26,675)
Proceeds from the divestiture or sale of assets	0	325
Settlement of foreign currency forward	0	3,701
Payments for acquisitions, net of cash acquired	0	(584,218)
Net cash used in investing activities	(17,560)	(606,867)
Cash flows from financing activities:
Repayments of credit facility	(50,000)	(53,600)
Credit facility issuance and refinancing costs	(623)	(41,790)
Proceeds from credit facility	277,539	959,708
Extinguishment of debt	(277,539)	(470,296)
Net proceeds from stock awards	10,720	6,324
Net cash (used in) provided by financing activities	(39,903)	400,346
Net increase (decrease) in cash and cash equivalents	2,586	(145,227)
Cash and cash equivalents at beginning of period	204,335	266,631
Cash and cash equivalents at end of period	$ 206,921	$ 121,404

XML

INCOME TAXES

6 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

For the quarter and six months ended March 31, 2013 we recorded an income tax provision of $3.4 million and $6.3 million, respectively. For the quarter and six months ended April 1, 2012, we recorded an income tax provision of $4.7 million and $4.4 million, respectively. The difference in our effective rate from the U.S. statutory rate of 35 percentis primarily a result of income being taxed in foreign jurisdictions at a lower rate which is partially offset by jurisdictions where we have not provided benefit for the current period losses as they are not expected to be realized in the foreseeable future. Our effective tax rates for the quarter and six months ended March 31, 2013 varies significantly when compared to the same periods for the prior year primarily because of changes in the mix of income by jurisdiction and having a pre-tax income for the quarter and six months ended March 31, 2013 compared to pre-tax loss for quarter and six months ended April 1, 2012. The effective tax provision for each period was the combined calculated tax expenses/benefits for various jurisdictions.

We file U.S., state, and foreign income tax returns in jurisdictions with varying statutes of limitations. The 2007 through 2012 tax years generally remain subject to examination by federal tax authorities, most state tax authorities and in significant foreign jurisdictions. Each quarter, we reassess our uncertain tax positions for additional unrecognized tax benefits, interest and penalties, and deletions due to statute expirations. Based on federal, state and foreign statute expirations in various jurisdictions, we anticipate a decrease in the unrecognized tax benefits of approximately $13.9 million within the next twelve months.

We establish liabilities for possible assessments by tax authorities resulting from known tax exposures including, but not limited to, international tax issues and certain tax credits. The Internal Revenue Service (“IRS”) is currently examining the Company's income tax returns for fiscal years 2007 through 2009. As of March 31, 2013, the IRS has raised questions primarily related to transfer pricing. Management believes that the Company's position is appropriate and that an adequate provision has been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company's tax audits are resolved in a manner not consistent with management's expectations, the Company would be required to adjust its provision for income tax in the period such resolution occurs. While the Company believes its reported results are accurate, any significant adjustments could have a material adverse effect on the Company's results of operations, cash flows and financial position if not resolved within expectations.

XML

PRESENTATION OF FINANCIAL INFORMATION - Earning Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
BASIC
Net income (loss)	$ (2,905)	$ (4,792)	$ 11,309	$ (49,394)
Weighted-average common shares outstanding	89,405	85,645	88,970	85,435
Basic earnings (loss) per share	$ (0.03)	$ (0.06)	$ 0.13	$ (0.58)
DILUTED
Net income (loss)	$ (2,905)	$ (4,792)	$ 11,309	$ (49,394)
Weighted-average common shares outstanding	89,405	85,645	88,970	85,435
Dilutive effect of stock awards	0	0	1,568	0
Weighted-average common shares outstanding on a diluted basis	89,405	85,645	90,538	85,435
Diluted earnings (loss) per share	$ (0.03)	$ (0.06)	$ 0.12	$ (0.58)

XML

STOCK-BASED COMPENSATION - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Performance stock units	Sep. 30, 2012 Performance stock units	Mar. 31, 2013 Stock Option Plan 2008 Year
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Additional shares to the shares limit in common stock							14.5
Shares limit in common stock							28.5
Plan expiration date							Dec. 05, 2021
Full value award of shares issued for every one share							2.41
Maximum term of a stock option grant or a stock appreciation right grant							6 years
Stock-based compensation expense	$ 10.2	$ 10.0	$ 18.3	$ 17.6
Vesting percentage relative to net sales					25.00%	50.00%
Vesting percentage relative to earnings per share					75.00%	50.00%
Performance based compensation percentage, target based					200.00%
Performance based compensation, peer group based					125.00%

XML

GOODWILL AND INTANGIBLE ASSETS, NET (Tables)

6 Months Ended

Mar. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and intangible assets, net consisted of the following components (amounts in thousands):

	March 31, 2013		September 30, 2012
Amortizable intangible assets
Completed technology	$	171,470	$	191,007
Customer relationships	183,795		205,145
Backlog	—		627
Other	1,908		3,212
	$	357,173	$	399,991
Non-amortizing intangible assets
Goodwill	790,236		790,236

Estimated Amortization Expense

Estimated amortization expense in each of the five succeeding years and thereafter is as follows (amounts in thousands):

	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter
Amortization expense	$	82,860	$	76,049	$	70,649	$	68,170	$	46,634	$	12,811