The 8550SST-D from SeCoS Corporation is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -1.2 V, Emitter Cut off Current -0.1 µA, Collector Base Voltage -40 V, Collector Cut off Current -0.1 µA. Tags: Through Hole, PNP Transistor. More details for 8550SST-D can be seen below.