Siliconix Files Patent Infringement Lawsuit against Advanced Analogic Technologies, Inc.

Business Editors/High-Tech Writers

SANTA CLARA, Calif.--(BUSINESS WIRE)--Jan. 28, 2004

Siliconix incorporated (NASDAQ:SILI), an 80.4% owned subsidiary of Vishay Intertechnology, Inc. (NYSE:VSH), announced that it filed a patent infringement lawsuit yesterday against Advanced Analogic Technologies, Inc. ("AnalogicTech") of Sunnyvale, California. The suit, filed in the United States District Court for the Northern District of California, alleges that certain specified AnalogicTech products infringe three Siliconix patents that relate generally to power metal-oxide-semiconductor field-effect transistor ("MOSFET") products used in computers, cellular phones, fixed communications networks, automobiles, and other electronics systems.

Dr. King Owyang, Siliconix President and CEO, stated, "The lawsuit against AnalogicTech is part of our continuing effort to protect Siliconix's proprietary Trench technology. Our intellectual property rights are central to our continued success in the marketplace. When we believe other companies are misappropriating our intellectual property rights, we intend to enforce those rights through legal action."

He concluded, "The patents, that we have determined AnalogicTech is infringing, are three of our fundamental United States patents covering our proprietary Trench technology, the 4,767,722, the 4,967,245 and the 5,034,785. The lawsuit identifies two AnalogicTech products that we believe are infringing, and we intend to determine whether there are additional infringing AnalogicTech products after further investigation."

Siliconix is a leading manufacturer of power MOSFETs, power ICs, analog switches, and multiplexers for computers, cell phones, fixed communications networks, automobiles, and other consumer and industrial electronic systems. With 2002 worldwide sales of $372.9 million, the Company's facilities include a Class 1 wafer fab dedicated to the manufacture of power products in Santa Clara, California, and an affiliated Class 1 wafer fab located in Itzehoe, Germany. The Company's products are also fabricated by subcontractors in Japan, Germany, China, Taiwan, and the United States. Assembly and test facilities include a company-owned facility in Taiwan, a joint venture in Shanghai, China, and subcontractors in the Philippines, China, Taiwan, and Israel.

Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE, is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, and transducers). Vishay's components can be found in products manufactured in a very broad range of industries worldwide. Vishay is headquartered in Malvern, Pennsylvania, and has operations in 17 countries employing over 25,000 people. Vishay can be found on the Internet at www.vishay.com.