MOSFETs make an excellent alternative to bipolar transistors in many applications. Their use as switching elements is particularly attractive as a small RDSon gives low device dissipation, and being voltage controlled there's less power wasted in heavy base drives as with low gain power transistors. They're simple to use, but I find trying to remember how to connect P channel types almost impossible! Purists will argue the toss over switching losses and the like, but that's another story.
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