The BD201 from Comset Semiconductors is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 2 V, Emitter Cut off Current 0.5 mA, Collector Base Voltage 60 V, Collector Cut off Current 1 mA. Tags: Through Hole, NPN Transistor. More details for BD201 can be seen below.