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 Semiconductors:

International Rectifier
Power Mosfets, IGBTs, Rectifiers, power controllers
www.irf.com

Texas Instruments
Power controllers, supervisory circuits, digital controllers
www.ti.com

Fairchild Semiconductors
Discrete Mosfets, IGBTs, Rectifiers, power controllers, supervisory, integrated power supplies
www.fairchildsemi.com

Power Integrations
Integrated power supplies
www.powerint.com

National Semiconductor
Integrated power supplies, power controllers
www.nationalsemiconductor.com

Intersil
Multiphase controllers
www.intersil.com