Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-48030

PROSPECTUS SUPPLEMENT NO. 7
(To Prospectus dated November 24, 2000)

                         [INTERNATIONAL RECTIFIER LOGO]
                      INTERNATIONAL RECTIFIER CORPORATION

          $550,000,000 4 1/4% CONVERTIBLE SUBORDINATED NOTES DUE 2007
                                      AND
     7,438,967 SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THE NOTES

    This prospectus supplement relates to the resale by holders of our 4 1/4%
Convertible Subordinated Notes Due 2007 and shares of common stock issuable upon
the conversion of the notes. This prospectus supplement may only be delivered or
used in connection with our prospectus dated November 24, 2000. Our common stock
is listed on The New York Stock Exchange and the Pacific Exchange under the
symbol "IRF."

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS SUPPLEMENT OR THE RELATED PROSPECTUS.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                  PROSPECTUS SUPPLEMENT DATED JANUARY 26, 2001

    The information appearing in the following table supplements or supersedes
in part the information in the table under the heading "Selling Holders" in our
prospectus and was provided by or on behalf of the selling holders.



                                                                                                                COMMON
                                                                                                                STOCK
                                                                                                             BENEFICIALLY
                                                                                                             OWNED AFTER
                                            PRINCIPAL AMOUNT OF      COMMON STOCK                              OFFERING
                                            NOTES BENEFICIALLY    BENEFICIALLY OWNED    COMMON STOCK    ----------------------
NAME AND ADDRESS                             OWNED AND OFFERED     BEFORE OFFERING       OFFERED(1)      AMOUNT          %
----------------                            -------------------   ------------------   --------------   --------      --------
                                                                                                       
Alpha US Sub Fund VIII LLC ...............     $  1,000,000            0                    13,525         0             *
  130 Cheshire Lane, Ste. 102
  Minnetonka, MN 55305

Deephaven Domestic
  Convertible Trading Ltd ................     $  7,000,000            0                    94,677         0             *
  130 Chesire Lane, Ste. 102
  Minnetonka, MN 55305

J.P. Morgan Securities, Inc. .............     $  5,871,000            0                    79,407         0             *
  500 Stanton--Christiana Rd.
  3/0 PS4
  Newark, DE 19713

Any other holder of notes or future            $  5,356,000            0                    72,442         0             *
  transferee, pledgee, donee or successor
  of any holder (2)(3)....................


------------------------------

*   Less than 1%.

(1) Assumes conversion of all the holder's notes at a conversion price of
    $73.935 per share of common stock and resale of all shares of common stock
    offered hereby.

(2) Information about other selling security holders will be set forth in
    prospectus supplements, if required.

(3) Assumes that any other holders of notes, or any future transferees,
    pledgees, donees or successors of or from any such other holders of notes,
    do not beneficially own any common stock other than the common stock
    issuable upon conversion of the notes at the initial conversion rate.

    Information concerning the selling holders may change from time to time and
any changed information will be set forth in supplements or amendments to the
prospectus if necessary. In addition, the per share conversion price, and
therefore the number of shares of common stock issuable upon conversion of the
notes, is subject to adjustment. As a result, the aggregate principal amount of
the notes and the number of shares of common stock into which the notes are
convertible may increase or decrease.

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