The BD911 from MOSPEC SEMICONDUCTOR is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 2.5 V, Emitter Cut off Current 1 mA, Collector Base Voltage 100 V, Collector Cut off Current 0.5 mA. Tags: Through Hole, NPN Transistor. More details for BD911 can be seen below.