Darlington npn transistors fairchild semiconductor bdw93c darlington power transistor npn polarity 100v collector emitter voltage vceo 100v collector base voltage vcbo 5v emitter base voltage veb 12a collector current 80w power 20000 dc current gain hfe 100ua collector cut off current 3v collector emitter saturation voltage to 220 case each 1 complementary silicon epitaxial base monolithic configuration integrated anti parallel collector emitter diode typical applicat