Advanced Semiconductor, Inc. (ASI) manufactures RF power transistors and microwave diodes. We are an ISO 9001:2008 registered company and specialize in manufacturing obsolete and hard-to-find components for both replacement purposes and new designs. Our line of RF power transistors primarily replaces those from Motorola, Philips, and SGS Thomson. Our line of microwave diodes primarily replaces those from HP, M/A-COM, Alpha, and Loral/Frequency sources.