The SFT4959 from Solid State Devices is a Bipolar Junction Transistor with Emitter Base Voltage 3 V, Collector Base Voltage 25 V, Collector Cut off Current 0.1 µA, Collector Emitter Breakdown Voltage 18 V, Collector Emitter Voltage 18 V. Tags: Through Hole, PNP Transistor. More details for SFT4959 can be seen below.