Court Reverses Injunction Decision Against Infineon Regarding Monolithic Integrated Power Stage Products

Neubiberg, Germany - November 20, 2009 - Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) today announced that, on November 17, 2009, the United States District Court in the Northern District of California issued a final order (under seal) denying the request for a preliminary injunction made by plaintiff Volterra Semiconductor Corporation in its patent suit against Infineon Technologies AG, Infineon Technologies North America Corp. and Primarion, Inc. (a wholly-owned subsidiary of Infineon Technologies North America Corp.). The Court’s Order means that Infineon and Primarion can continue to make, market, and sell their integrated power stage products without any restrictions. In addition, the Court also denied without prejudice Volterra’s motion for summary judgment of infringement. “We are very pleased that the Court, upon review of Infineon and Primarion’s arguments and further consideration of the issues, reversed its initial minute order and denied Volterra’s motion for a preliminary injunction,” said Gerhard Wolf, Vice President Industrial and Multimarket at Infineon Technologies North America Corp. About the Case Volterra filed a lawsuit against Infineon in November 2008, claiming that Infineon/Primarion’s PX4640 and PX4650 integrated power stage products infringe certain Volterra patents. In December 2008, Infineon and Primarion answered and filed counterclaims that their accused integrated power stage products do not infringe the Volterra patents and that the Volterra patents are invalid. At a hearing in September 2009, the Court initially granted Volterra’s motion for a preliminary injunction, but has now reversed its decision in favor of Infineon and Primarion. No trial date has been set. The Volterra patent claims at issue in the lawsuit are also the subject of reexamination proceedings that are currently pending before the United States Patent and Trademark Office.

About Infineon Infineon Technologies AG, Neubiberg, Germany, offers semiconductor and system solutions addressing three central challenges to modern society: energy efficiency, communications, and security. In the 2009 fiscal year (ending September), the company reported sales of Euro 3.03 billion with approximately 25,650 employees worldwide. With a global presence, Infineon operates through its subsidiaries in the U.S. from Milpitas, CA, in the Asia-Pacific region from Singapore, and in Japan from Tokyo. Infineon is listed on the Frankfurt Stock Exchange (ticker symbol: IFX) and in the USA on the over-the-counter market OTCQX International Premier (ticker symbol: IFNNY).