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Power transistor

Power transistors are designed to deliver a high output power and to have a high gain. Advances in high power transistors has opened new applications in power electronics for transistors that were previously dominated by other solid state switches such as the silicon controlled rectifier. Power transistors have the advantages of higher frequency application, low switching losses and relatively simple commutation schemes as compared to the silicon controlled rectifier. High power transistors are now finding application in motor drives, inverters, uninterrupted power supplies and converters. There are a number of types of power transistors, the most common being MOSFET and IGBT transistors, bipolar transistors and Darlington transistors. Power transistors, particularly MOS power transistors used in integrated circuits, generally have source and drain active regions formed in a semiconductor substrate. A typical RF power transistor device includes one or more transistor dies attached to a metallic mounting flange. In addition to serving as a support structure, the mounting flange serves as a combined reference ground and heat sink.

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