The SFT4300S.22 from Solid State Devices is a Bipolar Junction Transistor with Emitter Base Voltage 8 V, Base Emitter Saturation Voltage 1.1 V, Emitter Cut off Current 1 µA, Collector Base Voltage 150 V, Collector Cut off Current 75 µA. Tags: Surface Mount, NPN Transistor. More details for SFT4300S.22 can be seen below.