EL SEGUNDO, Calif. June 2004 - International Rectifier IR® (NYSE: IRF), a world leader in power management technology, today announced that its manufacturing facility in Leominster, Massachusetts, has achieved its ISO14001 certification. ISO14001 is a voluntary standard that details the management tools required for companies to plan, coordinate, and organize their efforts to protect the environment by reducing energy use, environmental impacts and natural resource depletion.

Greg Takagi, Director of International Rectifier's Loss Prevention and Environmental, Health and Safety group said, "International Rectifier continues to be dedicated to energy-saving activities in both our operations and the products we produce. Our Leominster facility's certification brings us another step closer to our goal of achieving ISO14001 compliance throughout our facilities worldwide."

IR's Leominster facility manufactures a wide array of advanced, high-reliability power management devices for government and space applications. Leominster joins many other International Rectifier facilities that have achieved ISO14001 certification, including its facilities in El Segundo and Temecula, California; Tijuana, Mexico; Xian, China; Krefeld, Germany; Swansea, Wales; and Newport, Wales.

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.

Trademark Notice

IR® are trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders.

For more information, contact Graham Robertson, grobert1@irf.com, 310-726-8512.