EXHIBIT 32.1

CERTIFICATION

PURSUANT TO

18 U.S.C. SECTION 1350

As Adopted Pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002

The undersigned, Oleg Khaykin, the Chief Executive Officer of International Rectifier Corporation (the “Company”), pursuant to 18 U.S.C. §1350, hereby certifies that:

(i) the Annual Report on Form 10-K of the Company for the fiscal year ended June 30, 2013 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Date: August 19, 2013

/s/ OLEG KHAYKIN

Oleg Khaykin

Chief Executive Officer
(Principal Executive Officer)