The BC857B from Nexperia is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -850 to -700 mV, Emitter Cut off Current -100 nA, Collector Base Voltage -50 V, Collector Cut off Current -4 uA. Tags: Surface Mount, PNP Transistor. More details for BC857B can be seen below.