The MMBT3904 from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 0.65 to 0.95 V, Emitter Cut off Current 50 nA, Collector Base Voltage 60 V, Collector Cut off Current 50 nA. Tags: Surface Mount, NPN Transistor. More details for MMBT3904 can be seen below.