The 2N2101 from New Jersey Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 10 V, Base Emitter Saturation Voltage 8 V, Emitter Cut off Current 0.05 mA, Collector Base Voltage 60 V, Collector Emitter Breakdown Voltage 40 V. Tags: Screw Mount, NPN Transistor. More details for 2N2101 can be seen below.