The MJ2501 from New Jersey Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 2 mA, Collector Base Voltage 80 V, Collector Cut off Current 1 to 5 mA, Collector Emitter Breakdown Voltage 80 V. Tags: Through Hole, PNP Transistor. More details for MJ2501 can be seen below.