The BC857CS-AU_R2_000A1 from Panjit Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.7 to 0.9 V, Emitter Cut off Current 100 nA, Collector Base Voltage 50 V, Collector Cut off Current 4 µA. Tags: Surface Mount, PNP Transistor. More details for BC857CS-AU_R2_000A1 can be seen below.