Sot 23 500mw medium power transistors zetex fmmt493 medium power transistor npn polarity 100v collector emitter breakdown voltage 120v collector base breakdown voltage 1a collector current 0 5w power 300 dc current gain 150mhz transition frequency sot 23 case 8mg weight zetex fmmt series silicon planar construction zetex fmmt493 sot23 npn transistor 493