Joint news release of Infineon Technologies and International Rectifier

International Rectifier Grants License Agreement for DirectFET® Packaging Technology to Infineon Technologies

Neubiberg, Germany and El Segundo, California - September 26, 2007 - Infineon Technologies (FSE/NYSE: IFX) and International Rectifier, IR® (NYSE: IRF) today announced that Infineon will license from International Rectifier its patented advanced power management packaging technology, DirectFET®. Designed for use in AC-DC and DC-DC power conversion applications in computers, notebooks, telecommunications and consumer electronics devices, the DirectFET power package is an industry-first surface-mount power MOSFET packaging technology for efficient topside cooling in an SO-8 footprint or smaller. Compared to standard plastic discrete packages, DirectFET’s metal can construction enables dual-sided cooling to effectively double the current handling capacity of high frequency DC-DC buck converters. Infineon will deploy the DirectFET power package technology with its OptiMOS® 2 and OptiMOS 3 chip technology and expects to sample the OptiMOS 2 in DirectFET packages starting early 2008. VP of IR’s Enterprise Power business unit, Tim Phillips said: “By deploying a unique dual-sided cooling design, IR’s DirectFET package technology is the preferred solution to reduce energy losses while shrinking the design footprint in advanced computing, consumer and communications applications. We are continually developing leading-edge technology to save energy and, through licensing agreements, we can broaden the energy-saving impact made possible with such innovations as DirectFET, as well as further expanding our presence in the largest segment of the power management market,” he added. “With this agreement, Infineon continues to expand its power semiconductor portfolio. Combining our successful OptiMOS chip technology with various package options suited for a wide range of applications, we enable power supply designers achieve energy and cost-efficient solutions for a given application,” said Arunjai Mittal, Senior Vice President and General Manager of the Power Management and Drives business unit at Infineon Technologies. “Providing OptiMOS 2 and OptiMOS 3 devices with their excellent characteristics in a package with double-sided cooling capability will further strengthen Infineon’s position in the power conversion market”. About International Rectifier International Rectifier (NYSE:IRF) is a world leader in power management technology. IR’s analog and mixed signal ICs, advanced circuit devices, integrated power systems and components enable high performance computing and reduce energy waste from motors, the world’s single largest consumer of electricity. Leading manufacturers of computers, energy efficient appliances, lighting, automobiles, satellites, aircraft and defense systems rely on IR’s power management benchmarks to power their next generation products. For more information, go to www.irf.com. Patent and Trademark Notice DirectFET® and IR® are registered trademarks of International Rectifier Corporation. OptiMOS® is a registered trademark of Infineon Technologies AG. All other product names noted herein may be trademarks of their respective holders. Press contact at International Rectifier: Graham Robertson Phone: +1 (310) 726-8512 Email: grobert1@irf.com

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 fiscal year 2006 (ending September), the company achieved sales of Euro 7.9 billion (including Qimonda sales of Euro 3.8 billion) with approximately 42,000 employees worldwide (including approximately 12,000 Qimonda employees). With a global presence, Infineon operates through its subsidiaries in the US from Milpitas, CA, in the Asia-Pacific region from Singapore, and in Japan from Tokyo. Infineon is listed on the Frankfurt Stock Exchange and on the New York Stock Exchange (ticker symbol: IFX). Further information is available at www.infineon.com.