Advanced Semiconductor, Inc. (ASI) manufactures RF power transistors and microwave diodes. They are an ISO 9001:2008 certified company and specialize in manufacturing obsolete and hard-to-find components for both replacement purposes and new designs. Their RF power transistor product line primarily replaces those from Motorola, Philips, and SGS Thomson. Their microwave diode line replace diodes from HP, M/A-COM, Alpha, and Loral/Frequency sources. The company was founded in 1979 and has offices in the United Kingdom, France, India, and Egypt.