POWER OF ATTORNEY



KNOW BY ALL THESE PRESENTS, that the undersigned hereby constitutes and appoints each of

Donald R. Dancer, Lawrence A. Michlovich and Teresa R. Kumiyama, signing individually, and in each

case so long as such person remains an employee of the International Rectifier Corporation

("Company") legal department, the undersigned's true and lawful attorney-in-fact to:



(1) execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or

director of the Company, Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities

Exchange Act of 1934 and the rules thereunder;



(2) do and perform any and all acts for and on behalf of the undersigned which may be necessary

or desirable to complete and execute any such Forms 3, 4, and 5, complete and execute any

amendment or amendments thereto, and timely file such form with the United States Securities

and Exchange Commission and any stock exchange or similar authority; and



(3) take any other action of any type in connection with the foregoing which, in the option of such

attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the

undersigned, it being understood that the documents executed by such attorney-in-fact on behalf

of the undersigned pursuant to the Power of Attorney shall be in such form and shall contain

such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's

discretion.



The undersigned hereby grants to each such attorney-in-fact full power and authority to do and

perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the

exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the

undersigned might or could do if personally present, with full power of substitution or revocation,

hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or

substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights

and powers herein granted.  The undersigned acknowledges that the foregoing attorney-in-fact, in

serving in such capacity at the request of the undersigned, are not assuming, nor is the Company

assuming, any of the undersigned responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934.



This Power of Attorney shall remain in full force and effect until the undersigned is no longer

required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transaction in

securities issued by the Company, unless earlier revoked by the undersigned in a signed writing

delivered to the foregoing attorneys-in-fact.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as

of the 17th day of October 2006









/s/ Philip M. Neches__________

Name:  Philip M. Neches, Ph.D.