The MMBTA28-TP from Micro Commercial Components is a Bipolar Junction Transistor with Emitter Base Voltage 12 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 80 V, Collector Cut off Current 0.1 µA, Collector Emitter Breakdown Voltage 80 V. Tags: Surface Mount, NPN Transistor. More details for MMBTA28-TP can be seen below.