The MPSA20 from Central Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 4 V, Collector Cut off Current 100 nA, Collector Emitter Breakdown Voltage 40 V, Collector Emitter Voltage 40 V, Continuous Collector Current 0.1 A. Tags: Through Hole, NPN Transistor. More details for MPSA20 can be seen below.