Table of Contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

Amendment No. 1

(Mark One)

For the fiscal year ended April 3, 2011

OR

For the transition period from              to             .

Commission File No. 000-12695

INTEGRATED DEVICE TECHNOLOGY, INC.

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s Telephone Number, Including Area Code: (408) 284-8200

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)    Yes  ¨    No  x

The aggregate market value of the voting and non-voting common equity held by non-affiliates was approximately $671 million, computed by reference to the last sales price of $5.70 as reported by The NASDAQ Stock Market LLC, as of the last business day of the registrant’s most recently completed second fiscal quarter, September 26, 2010. Shares of common stock held by each executive officer and director and by each person who owns 5% or more of the outstanding common stock have been excluded in that such persons may be deemed affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

The number of outstanding shares of the registrant’s Common Stock, $.001 par value, as of April 29, 2011 was approximately 148,173,243.

Table of Contents

TABLE OF CONTENTS

Table of Contents

EXPLANATORY NOTE

This Amendment No. 1 on Form 10-K/A (this “Amendment” or “Form 10-K/A”) to the registrant’s Annual Report on Form 10-K for the fiscal year ended April 3, 2011 (the “Original Annual Report”), which was initially filed with the Securities and Exchange Commission (“SEC”) on May 31, 2011, is being made solely to amend the Original Annual Report as follows:

The complete text of Item 9B and Item 15, as amended, is included in this Amendment.

Except as described above, no attempt has been made in this Amendment to modify or update other disclosures presented in the Original Annual Report. This Amendment does not reflect events occurring after the filing of the Original Annual Report, or modify or update those disclosures, including the exhibits to the Original Annual Report, affected by subsequent events. Accordingly, this Amendment should be read in conjunction with the registrant’s filings with the SEC subsequent to the filing of the Original Annual Report, including any amendments to those filings.

1

Table of Contents

PART II

Effective January 7, 2011, Mansour Izadinia terminated his employment with Integrated Device Technology, Inc. (“IDT” or the “Company”) as the Company’s Senior Vice President, Chief Technology Officer. In connection with the termination, the Company and Mr. Izadinia entered into a separation agreement and release dated January 10, 2011 (the “Separation Agreement”), which provides that Mr. Izadinia shall receive certain compensation and benefits from the Company, including the following:

The Separation Agreement also provides that Mr. Izadinia shall have 12 months to exercise his vested stock options as of his termination date.

The Separation Agreement includes certain nondisclosure, nonsolicitation and nondisparagement obligations of Mr. Izadinia as well as a general release by Mr. Izadinia of any and all claims against the Company. The Separation Agreement also includes certain confidentiality and nondisparagement obligations of the Company and a release by the Company of all claims against Mr. Izadinia.

2

Table of Contents

PART IV

2. Financial Statement Schedules. Schedule II, “Valuation and Qualifying Accounts,” was included in the Annual Report on Form 10-K for the fiscal year ended April 3, 2011, as originally filed.

3. Exhibits. The exhibits listed in the Exhibit Index below are filed, furnished or incorporated by reference as part of this report.

3

Table of Contents

4

Table of Contents

5

Table of Contents

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

6

Table of Contents

EXHIBIT INDEX

Table of Contents