The BC817-25-C from SeCoS Corporation is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 1.2 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 50 V, Collector Cut off Current 0.1 µA. Tags: Surface Mount, NPN Transistor. More details for BC817-25-C can be seen below.