Alpha and Omega Semiconductor is committed to excellence in design, manufacturing, and responsiveness to our customers through the continued development of new technologies, products and innovative solutions. We bring to the market devices designed to benefit our customers by meeting their product specific needs. Our mission is to bring value to our customers, shareholders and employees.

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What We Do

We pride ourself in our expertise in all areas of power semiconductor technology and business operations. Our intellectual property and technical knowledge encompasses the latest advancements in the power semiconductor industry. 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 but not limited to 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.

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Corporate Responsibility

The environment is at the top of the agenda for governments, civil society and citizens in general. At AOS, we are increasingly turning our attention to the environmental impact of our activities, products and services. We are actively committed to improve the efficiency of products, to reduce the energy consumption and to promote low-carbon economic growth. We help our clients and the industry supply chain to realize sustainable development.

Learn more about our commitments
jireh manufacturing

Jireh Semiconductor

Jireh Semiconductor, Inc., a wholly owned subsidiary of Alpha and Omega Semiconductor Ltd., is the in-house wafer fab for AOS and is located in Hillsboro, Oregon.

View job openings at Jireh


Mike Chang
Mike F. Chang Ph.D.

Executive Chairman

Mike F. Chang, Ph.D., is the founder of our company and serves as our Executive Chairman. He served as Chief Executive Officer from the founding of our company until March 2023. Dr. Chang has extensive experience in both technology development and business operations in the power semiconductor industry. Prior to establishing our company, Dr. Chang served as the Executive Vice President at Siliconix Incorporated, a subsidiary of Vishay Intertechnology Inc., a global manufacturer and supplier of discrete and other power semiconductors, or Siliconix, from 1998 to 2000. Dr. Chang also held various management positions at Siliconix from 1987 to 1998. Earlier in his career, Dr. Chang focused on product research and development in various management positions at General Electric Company from 1974 to 1987. Dr. Chang received his B.S. in electrical engineering from National Cheng Kung University, Taiwan, and M.S. and Ph.D. in electrical engineering from the University of Missouri. Dr. Chang’s wealth of experience and knowledge in the semiconductor industry and leadership skills provide the Board with guidance on the Company’s strategic direction to achieve continuing success.

Stephen Chang
Stephen C. Chang

Chief Executive Officer

Mr. Stephen C. Chang serves as Chief Executive Officer effective March 2023. He previously served as the Company’s President since January 2021. Prior to that, he served in various management positions, including Executive Vice President of Product Line Management, Senior VP of Marketing, VP of the MOSFET Product Line, and Senior Director of Product Marketing. Mr. Chang has over 20 years of industry experience and leads the Company’s business strategies, product and technology development, sales and marketing functions, manufacturing operation and supply chain management, and other managerial responsibilities. He received his B.A. in Electrical Engineering from University of California, Berkeley, and M.B.A. from Santa Clara University. Mr. Chang’s extensive technological expertise and business experiences in the power semiconductor industry and his knowledge of our day-to-day operations and strategic initiatives provide our Board of Directors with valuable insights and in-depth understanding of our Company.

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Wenjun Li

Chief Operating Officer

Wenjun. Li, Ph.D., serves as our Chief Operating Officer since August 2021. Prior to that, Dr. Li served in various management positions in our Company since 2012, including Executive Vice President of World-Wide Manufacturing, Senior Vice President of World-Wide Manufacturing, Vice President of Front-End Operation, the director of Process Integration and Senior Manager of Process Integration. Dr. Li holds a B.S. in Chemistry and a M.S. in Chemical Engineering from Taiyuan University of Technology, and a Ph.D. in Microelectronics & Solid-State Electronics from the Research Institute of Micro-Nanometer Technology at Shanghai Jiao Tong University.

Yifan Liang
Yifan Liang

Chief Financial Officer and Corporate Secretary

Yifan Liang has been serving as our Chief Financial Officer since August 2014 and Corporate Secretary since November 2013. Mr. Liang served as our Interim Chief Financial Officer from November 2013 to August 2014, our Chief Accounting Officer since October 2006, and our Assistant Corporate Secretary from November 2009 to November 2013. Mr. Liang joined our company in August 2004 as our Corporate Controller. Prior to joining us, Mr. Liang held various positions at PricewaterhouseCoopers LLP, or PwC, from 1995 to 2004, including Audit Manager in PwC's San Jose office. Mr. Liang received his B.S. in management information system from the People's University of China and M.A. in finance and accounting from the University of Alabama.

Bing Xue
Bing Xue

Executive Vice President of Worldwide Sales and Business Development

Bing Xue, Ph.D., serves as our Executive Vice President of Worldwide Sales and Business Development since January 2021. Prior to that, Dr. Xue held various managerial positions in our company since 2003, including Senior Vice President of Global Sales, Vice President of Global Sales, Vice President of Worldwide Manufacturing, and General Manager of China Operation. Prior to joining us, Dr. Xue served as the Director of Engineering in Dowslake Microsystems Corporation from 2001 to 2003. Dr. Xue received his B.S. in Physics from Xiamen University, and Ph.D. in Physical Chemistry from University of Pennsylvania.