The FMMT491-TP from Micro Commercial Components is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 1.1 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 80 V, Collector Cut off Current 0.1 µA. Tags: Surface Mount, NPN Transistor. More details for FMMT491-TP can be seen below.