Darlington npn transistors fairchild semiconductor bcx38c darlington transistor npn polarity 60v collector emitter voltage vceo 80v collector base voltage vcbo 10v emitter base voltage veb 500ma collector current 1w power 10000 dc current gain hfe 100na collector cut off current 125v collector emitter saturation voltage to 92 case 159mg weight tape amp reel 4000 silicon planar construction medium power fairchild semiconductor bcx38c darlington npn 60v 08a e line