The AC857BSQ-7 from Diodes Incorporated is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -700 mV, 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 AC857BSQ-7 can be seen below.