The 2N2221 from Comset Semiconductors is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 1.3 to 2.6 V, Emitter Cut off Current 10 nA, Collector Base Voltage 60 V, Collector Cut off Current 10 µA. Tags: Through Hole, NPN Transistor. More details for 2N2221 can be seen below.