UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported) January 28, 2010

INTERNATIONAL RECTIFIER CORPORATION

(Exact Name of Registrant as Specified in Charter)

Delaware

(State or Other
Jurisdiction

of Incorporation)

001-7935

(Commission

File Number)

95-1528961

(IRS Employer

Identification No.)

233 Kansas Street, El Segundo, California 90245

(Address of Principal Executive Offices) (Zip Code)

(310) 726-8000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01. Regulation FD Disclosure

On January 28, 2010 International Rectifier Corporation issued a press release announcing the conclusion of the Securities and Exchange Commission investigation into the Company’s prior restatement. A copy of that press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

The information in this Item 7.01, including Exhibit 99.1, of this Current Report on Form 8-K will not be treated as filed for the purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section. This information will not be incorporated by reference into a filing under the Securities Act of 1933, or into another filing under the Exchange Act, unless that filing expressly refers to specific information in this report. The furnishing of the information in this Item 7.01 of this report is not intended to, and does not, constitute a representation that such furnishing is required by Regulation FD or that the information in this Item 7.01 is material investor information that is not otherwise publicly available.

Item 9.01. Financial Statement and Exhibits

(d) Exhibits

Exhibit Number		Description

99.1		Press Release of International Rectifier Corporation, dated January 28, 2010.

SIGNATURES

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

Date: January 28, 2010	INTERNATIONAL RECTIFIER CORPORATION


	By:	/s/ Timothy E. Bixler

		Name:	Timothy E. Bixler
		Title:	Vice President, General Counsel and Secretary

EXHIBIT INDEX

Exhibit Number		Description

99.1		Press Release of International Rectifier Corporation, dated January 28, 2010.