NPN Transistor, SOT-23 Package, 45V, 500mA, 160-400 hFEPACK SMD OF 3000 PIECES The BC817 25 is an NPN bipolar junction transistor (BJT) that comes in a small SOT 23 surface mount package. This transistor is capable of handling a collector current of up to 500mA, making it suitable for medium power applications. It can operate with collector to emitter voltages up to 45V, providing flexibility for use in a variety of electronic circuits. The hFE (current gain) of the BC817 25 ranges between 160 and 400,