International Rectifier Introduces Two DirectFET MOSFET Chip Sets for

    Technology Editors

    EL SEGUNDO, Calif.--(BUSINESS WIRE)--April 20, 2005--International Rectifier, IR(r) (NYSE:IRF), a world leader in power management technology, today introduced two new 30V DirectFET(tm) MOSFET synchronous buck converter chip sets for advanced notebook computer designs using the latest Intel(r) and AMD processors where small size, high efficiency and improved thermal conduction are required.
    "The new 30V chip sets offer high efficiency over their entire rated load range. In addition, these 30V devices offer higher power density than traditional packaging options through the smaller package size and the ability to operate at high current levels using a single control and a single sync MOSFET. This means improved thermal performance and smaller form factors, necessary for super-compact, battery-efficient, portable and mobile computing," said Jeff Sherman, International Rectifier Marketing Manager, Portable Computing Solutions.
    Each chip set consists of a control MOSFET and a synchronous MOSFET, with each device tailored to maximize performance in their role within a synchronous DC-DC buck converter circuit. Control MOSFETs have reduced switching losses, while synchronous MOSFETs have low conduction losses (low on-resistance), and low reverse-recovery charge.
    The first chip set, the IRF6617 control FET and IRF6611 synchronous FET, is designed for optimum performance up to 20A per power channel in high density, space-restricted circuit boards. The second pair, the IRF6637 control FET and IRF6678 synchronous FET, is designed for increased thermal performance in applications requiring greater than 20A per power channel.
    The IRF6617 control FET is housed in a small can (ST) DirectFET package while the IRF6637 control FET is housed in the medium can (MP) DirectFET package. To enable an easy migration path for existing designs, both synchronous FETs are housed in the medium can (MX) DirectFET package, allowing a simple change from the IRF6611 to the IRF6678 when more current or increased thermal performance is desired.
    The new chip sets also enable circuit designers to shrink high frequency, high current DC-DC converters used to power high-end desktop computers and servers, as well as advanced telecom and datacom systems.

    Patented DirectFET(tm) Packaging Technology

    International Rectifier's patented DirectFET MOSFET packages present a whole new set of design advantages not previously delivered by standard plastic discrete packages. Their metal can construction enables dual-side cooling that effectively doubles the current handling capacity of high frequency DC-DC buck converters powering advanced microprocessors. In addition, devices in the DirectFET packages are lead- and bromide-free.
    Data sheets are posted on the International Rectifier Web site.

New DC-DC Control and Synchronous DirectFET(tm) MOSFET Chip Sets For Space-Restricted Circuits Up to 20A Control MOSFET IRF6617: http://www.irf.com/product-info/datasheets/data/irf6617.pdf Synchronous MOSFET IRF6611: http://www.irf.com/product-info/datasheets/data/irf6611.pdf

For More Thermal Performance Greater than 20A Per Power Channel Control MOSFET IRF6637: http://www.irf.com/product-info/datasheets/data/irf6637.pdf Synchronous MOSFET IRF6678: http://www.irf.com/product-info/datasheets/data/irf6678.pdf

Availability and Pricing The new 30V DirectFET MOSFET chip sets are available immediately. Pricing is as follows, in US dollars and 10,000-unit quantities: IRF6678 synchronous FET: $1.25 each IRF6611 synchronous FET: $1.09 each IRF6637 control FET: $0.91 each IRF6617 control FET: $0.87 each Prices are subject to change.

    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

    IR's proprietary DirectFET technology is covered by US Patents 6624522, 6784540 and multiple other US and foreign pending patent applications. DirectFET(TM) is a trademark of International Rectifier Corporation. IR(r) and HEXFET(r) are registered trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders.
    For more information, contact Wayne Yoshida, wyoshid1@irf.com, 310-252-7726.

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CONTACT: International Rectifier Wayne Yoshida, 310-252-7726 wyoshid1@irf.com

KEYWORD: CALIFORNIA INDUSTRY KEYWORD: HARDWARE TELECOMMUNICATIONS SOFTWARE NETWORKING PRODUCT SOURCE: International Rectifier

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