Advanced Semiconductor, Inc. (ASI) manufactures RF power transistors and microwave diodes. They are an ISO 9001 registered company and specialize in manufacturing obsolete and hard-to-find components for both replacement purposes and new designs. Their line of RF power transistors primarily replaces those from Motorola, Philips, and SGS Thomson. Their line of microwave diodes primarily replaces those from HP, M/A-COM, Alpha, and Loral/Frequency sources.Advanced Semiconductor has a fundamental commitment to customer service and will always do our best to ensure that your needs are met.