The S9018T-I from SeCoS Corporation is a Bipolar Junction Transistor with Emitter Base Voltage 4 V, Base Emitter Saturation Voltage 1.4 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 25 V, Collector Cut off Current 0.1 µA. Tags: Through Hole, NPN Transistor. More details for S9018T-I can be seen below.