The TIP42B from Mospec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 1 mA, Collector Base Voltage 80 V, Collector Cut off Current 0.4 mA, Collector Emitter Voltage 80 V. Tags: Through Hole, PNP Transistor. More details for TIP42B can be seen below.