The MMST3904Q-7-F from Diodes Incorporated is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 0.65 to 0.95 V, Collector Base Voltage 60 V, Collector Cut off Current 50 nA, Collector Emitter Breakdown Voltage 40 V. Tags: Surface Mount, NPN Transistor. More details for MMST3904Q-7-F can be seen below.