The BCP54 from onsemi is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 1 V, Emitter Cut off Current 10 µA, Collector Base Voltage 45 V, Collector Cut off Current 10 µA. Tags: Surface Mount, NPN Transistor. More details for BCP54 can be seen below.