The BC847A-Q from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 700 to 900 mV, Emitter Cut off Current 100 nA, Collector Base Voltage 50 V, Collector Cut off Current 0.1 to 5 µA. Tags: Surface Mount, NPN Transistor. More details for BC847A-Q can be seen below.