The SFT3507S.22 from Solid State Devices is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.8 to 2 V, Emitter Cut off Current 1 µA, Collector Base Voltage 80 V, Collector Cut off Current 1 µA. Tags: Surface Mount, NPN Transistor. More details for SFT3507S.22 can be seen below.