The MMST3906 from Galaxy Century Microelectronics is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -0.95 to -0.65 V, Emitter Cut off Current -50 nA, Collector Base Voltage -40 V, Collector Cut off Current -50 nA. Tags: Surface Mount, PNP Transistor. More details for MMST3906 can be seen below.