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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001181431-04-055141.txt : 20041124
<SEC-HEADER>0001181431-04-055141.hdr.sgml : 20041124
<ACCEPTANCE-DATETIME>20041124174829
ACCESSION NUMBER:		0001181431-04-055141
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041123
FILED AS OF DATE:		20041124
DATE AS OF CHANGE:		20041124

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GENTILE JAMES H
		CENTRAL INDEX KEY:			0001192188

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08866
		FILM NUMBER:		041168283

	MAIL ADDRESS:	
		STREET 1:		MICROSEMI CORP
		STREET 2:		2381 MORSE AVE
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92614

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MICROSEMI CORP
		CENTRAL INDEX KEY:			0000310568
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952110371
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		2381 MORSE AVENUE
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92614
		BUSINESS PHONE:		7149798220

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MICROSEMICONDUCTOR CORP
		DATE OF NAME CHANGE:	19830323
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd59274.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

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    <periodOfReport>2004-11-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000310568</issuerCik>
        <issuerName>MICROSEMI CORP</issuerName>
        <issuerTradingSymbol>MSCC</issuerTradingSymbol>
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            <rptOwnerName>GENTILE JAMES H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
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            <rptOwnerZipCode>92614</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President of Sales</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>ISO Option to Buy Common Stock</value>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
                    <value>7.1406</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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        <nonDerivativeTransaction>
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            <transactionDate>
                <value>2004-11-23</value>
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                <transactionFormType>4</transactionFormType>
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            <transactionAmounts>
                <transactionShares>
                    <value>3000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>7.1406</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2001-11-28</value>
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            <expirationDate>
                <value>2010-11-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>3000</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>157600</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
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    <footnotes>
        <footnote id="F1">This incentive stock opion was granted pursuant to Microsemi Corporation's 1987 Stock Plan, which satisfies the requirements of Rule 16b-3.  The option becomes exercisable in four equal installments, commencing one year after the date of the grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Debbie Weber, Attorney-in-Fact for James H. Gentile</signatureName>
        <signatureDate>2004-11-24</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----