The MMBT3904W_R1_00001 from Panjit Semiconductor 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 MMBT3904W_R1_00001 can be seen below.