The BCP51-10 from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 100 nA, Collector Base Voltage 45 V, Collector Cut off Current 0.1 to 10 µA, Collector Emitter Voltage 45 V. Tags: Surface Mount, PNP Transistor. More details for BCP51-10 can be seen below.