UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

July 18, 2011

Date of Report (Date of earliest event reported)

EXAR CORPORATION

(Exact name of registrant as specified in its charter)

48720 Kato Road, Fremont, CA 94538

(Address of principal executive offices, Zip Code)

(510) 668-7000

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On July 18, 2011, Exar Corporation (the “Company”) issued a press release announcing, among other things, selected preliminary results for its first fiscal quarter of 2012, which ended July 3, 2011, providing that the Company’s financial results for the first fiscal quarter are expected to exceed guidance previously provided on May 5, 2011. A copy of the press release is attached as Exhibit 99.1 hereto and is incorporated herein by reference.

The information in this Current Report on Form 8-K and the Exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

The Company reports its financial results in accordance with GAAP. Additionally, the Company supplements reported GAAP financials with non-GAAP measures which are included in related press releases and reports furnished to the SEC, copies of which are available at the Company’s website: http://www.exar.com or the SEC’s website at: http://www.sec.gov. For the periods discussed, we are disclosing non-GAAP operating income that is adjusted to exclude from our GAAP results all stock-based compensation expense, amortization of acquired intangible assets and exit costs. This non-GAAP measure is presented in part to enhance the understanding of the Company’s historical financial performance and comparability between reporting periods. The Company believes the non-GAAP presentation, when shown in conjunction with the corresponding GAAP measures, provide relevant and useful information to analysts, investors, management and other interested parties following the semiconductor industry. For its internal purposes, the Company uses the foregoing non-GAAP measure to evaluate performance across reporting periods, determine certain employee benefits as well as plan for and forecast the Company’s future periods. This non-GAAP measure is not in accordance with, or an alternative for measures prepared in accordance with GAAP, and may be different from non-GAAP measures used by other companies. In addition, these non-GAAP measures are not based on any comprehensive set of accounting rules or principles. The Company believes that non-GAAP measures have limitations in that they do not reflect all of the amounts associated with the Company’s results of operations as determined in accordance with GAAP. This measure should only be used to evaluate the Company’s results of operations in conjunction with the corresponding GAAP measures.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX