The BCP54-16-HF from Comchip Technology is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Collector Base Voltage 45 V, Collector Cut off Current 0.1 to 20 µA, Collector Emitter Breakdown Voltage 45 V, Collector Emitter Voltage 45 V. Tags: Surface Mount, NPN Transistor. More details for BCP54-16-HF can be seen below.