Press release

Alpha and Omega Semiconductor to Announce Fiscal Third Quarter 2019 Financial Results

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Alpha and Omega Semiconductor Limited (“AOS”) (Nasdaq:AOSL) today
announces that the company will release its financial results for the
fiscal 2019 third quarter ended March 31, 2019 on Thursday, May 2, 2019,
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 866-393-4306 (or
734-385-2616 if dialing from outside the United States and Canada). The
conference ID number is 5992529. 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.

A telephone replay of the call will be available approximately two hours
after the conference call and will be available for seven days. The
replay dial-in number is 855-859-2056 (or 404-537-3406 if dialing from
outside the United States and Canada), and the access code is 5992529.

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, IGBT, IPM and Power IC products. AOS
has developed extensive intellectual property and technical knowledge
that encompasses the latest advancements in the power semiconductor
industry, which enables us to introduce innovative products to address
the increasingly complex power requirements of advanced electronics. AOS
differentiates itself by integrating its Discrete and IC semiconductor
process technology, product design, and advanced packaging know-how to
develop high performance power management solutions. AOS’s portfolio of
products targets high-volume applications, including portable computers,
flat panel TVs, LED lighting, smart phones, battery packs, consumer and
industrial motor controls and power supplies for TVs, computers, servers
and telecommunications equipment. For more information, please visit www.aosmd.com.