The MJ10003 from New Jersey Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 8 V, Base Emitter Saturation Voltage 2.5 V, Collector Emitter Voltage 400 V, Continuous Collector Current 20 A, DC Current Gain 30 to 40. Tags: Through Hole, NPN Transistor. More details for MJ10003 can be seen below.