Darlington npn transistors fairchild semiconductor tip121 darlington transistor npn polarity 80v collector emitter voltage vceo 80v collector base voltage vcbo 5v emitter base voltage veb 5a collector current 65w power 1000 dc current gain hfe 05ma collector cut off current 4v collector emitter saturation voltage to 220 case 198g weight bag 200 high power plastic package typical applications includes high power switching hammer drive pulse motor drive and inductive