The 2N1531 from New Jersey Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 40 V, Collector Base Voltage 80 V, Collector Emitter Voltage 40 V, Continuous Collector Current 3 A, DC Current Gain 20 to 40. Tags: Through Hole, NPN Transistor. More details for 2N1531 can be seen below.