Exhibit 3.1

RESTATED

CERTIFICATE OF INCORPORATION

OF

INTERNATIONAL RECTIFIER CORPORATION

ARTICLE ONE

The name of the corporation is International Rectifier Corporation (hereinafter called the “Corporation”).

ARTICLE TWO

The address of the Corporation’s registered office is located at 2711 Centerville Road, Suite 400, Wilmington, New Castle County, Delaware 19808. The name of its registered agent at such address is Corporation Service Company.

ARTICLE THREE

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

ARTICLE FOUR

The total number of shares which the Corporation shall have the authority to issue is one thousand (1,000) shares, all of which shall be shares of Common Stock, with a par value of one dollar ($1.00) per share.

ARTICLE FIVE

The board of directors of the Corporation (the “Board of Directors”) shall have the power to adopt, amend or repeal by-laws, except as may otherwise be provided in the by-laws.

ARTICLE SIX

The Corporation expressly elects not to be governed by Section 203 of the DGCL.

ARTICLE SEVEN

Whenever a compromise or arrangement is proposed between the Corporation and its creditors or any class of them and/or between the Corporation and its stockholders or any class of them, any court of equitable jurisdiction within the State of Delaware may, on the application in a summary way of the Corporation or any creditor or stockholder thereof or on the application of any receiver or receivers appointed for the Corporation under the provisions of Section 291 of the DGCL or on the application of trustees in dissolution or of any receiver or receivers appointed for the Corporation under the provisions of Section 279 of the DGCL, order a meeting of the creditors or class of creditors, and/or the stockholders or class of stockholders of the Corporation, as the case may be, to be summoned in such manner as the said court directs. If a majority in number representing three-fourths in value of the creditors or class of creditors, and/or of the stockholders or class of stockholders of the Corporation, as the case may be, agree to any compromise or arrangement and to any reorganization of the Corporation as a consequence of such compromise or arrangement, the said compromise or arrangement and the said reorganization shall, if sanctioned by the court to which the said application has been made, be binding on all the creditors or class of creditors, and/or on all the stockholders, or class of stockholders, of the Corporation, as the case may be, and also on this Corporation.

ARTICLE EIGHT

Section 1.          Competition and Corporate Opportunities. To the fullest extent permitted by law, the Corporation hereby renounces any interest or expectancy in, or in being offered any opportunity to participate in, any business opportunities that are presented to any of its directors or stockholders, except that the foregoing shall not apply to any member of management of the Corporation or any of its subsidiaries that is also a director or a stockholder.

Section 2.          Deemed Notice.  Any person or entity purchasing or otherwise acquiring any interest in any shares of the Corporation shall be deemed to have notice of and to have consented to the provisions of this Article Eight.

ARTICLE NINE

To the fullest extent permitted by the DGCL as the same exists or may hereafter be amended, a director of the Corporation shall not be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as director.

ARTICLE TEN

The Corporation reserves the right to amend or repeal any provisions contained in this Restated Certificate of Incorporation from time to time and at any time in the manner now or hereafter prescribed by the laws of the State of Delaware, and all rights conferred upon stockholders and directors are granted subject to such reservation.