Alpha and Omega Semiconductor Announces Fiscal Fourth Quarter and Fiscal Year 2010 Conference Call and Webcast

July 20, 2010

SUNNYVALE, Calif., July 20, 2010 (GLOBE NEWSWIRE) -- Alpha and Omega Semiconductor Limited ("AOS") (Nasdaq:AOSL) today announced that the company will release its financial results for the fiscal fourth quarter and the fiscal year ended June 30, 2010 on Tuesday, August 10, 2010, after the market closes. The press release will be followed by a conference call and live webcast at 2:00 p.m. PT / 5:00 p.m. ET, which will be open to the public. During the conference call, the company will review the financial results and discuss other business matters.

To listen to the live conference call, please dial 877-312-8797 (or 253-237-1194 if dialing from outside the U.S.A.). A live webcast of the call will also be available in the "Events & Presentations" section of the company's investor relations website, http://investor.aosmd.com/. The webcast replay will be available for seven days after the live call on the same website.

About Alpha and Omega Semiconductor

Alpha and Omega Semiconductor Limited, or AOS, is a designer, developer and global supplier of a broad range of power semiconductors, including a wide portfolio of Power MOSFET and Power IC products. AOS seeks to differentiate itself by integrating its expertise in device physics, process technology, design and advanced packaging to optimize product performance and cost, and its product portfolio is designed to meet the ever increasing power efficiency requirements in high volume applications, including portable computers, flat panel TVs, battery packs, portable media players and power supplies. For more information, please visit www.aosmd.com.

Forward-Looking Statements

This press release contains forward-looking statements that are based on current expectations, estimates, forecasts and projections of future performance based on management's judgment, beliefs, current trends and market conditions, and involve risks and uncertainties that may cause actual results to differ materially from those contained in the forward-looking statements. These factors include, but are not limited to, the ability to introduce and develop new products that achieve market acceptance, the ability to achieve design wins, the general business and economic conditions, the state of semiconductor industry, and other risks as described in the Company's filings with the Securities and Exchange Commission. Although the Company believes that the expectations reflected in the forward-looking statements are reasonable, it cannot guarantee future results, level of activity, performance, or achievements. You should not place undue reliance on these forward-looking statements. All information provided in this press release is as of today's date, unless otherwise stated, and AOS undertakes no duty to update such information, except as required under applicable law.

CONTACT:  Alpha and Omega Semiconductor Limited
          Hao Guan, Investor Relations
          investors@aosmd.com

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