The BCP55-16 from Galaxy Century Microelectronics is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 100 nA, Collector Base Voltage 60 V, Collector Cut off Current 100 nA, Collector Emitter Breakdown Voltage 60 V. Tags: Surface Mount, NPN Transistor. More details for BCP55-16 can be seen below.