Sot 23 general purpose npn transistors diodes inc bc817 40 general purpose transistor npn polarity 45v collector emitter breakdown voltage 500ma collector current 225mw power 630 dc current gain 100mhz transition frequency sot 23 case designed for use in drive and output stages of audio amplifiers supplied in reel of 3000 diodes inc bc817 40 reel 3k transistor sot23