The BC857W-AU from KEC Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -0.9 to -0.7 V, Collector Base Voltage -50 V, Collector Cut off Current -15 nA, Collector Emitter Voltage -45 V. Tags: Surface Mount, PNP Transistor. More details for BC857W-AU can be seen below.