The BD137-6 from SeCoS Corporation is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 10 µA, Collector Base Voltage 60 V, Collector Cut off Current 0.1 µA, Collector Emitter Breakdown Voltage 60 V. Tags: Through Hole, NPN Transistor. More details for BD137-6 can be seen below.