The BC848A-AQ from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 700 to 900 mV, Emitter Cut off Current 100 nA, Collector Base Voltage 30 V, Collector Cut off Current 0.1 to 5 µA. Tags: Surface Mount, NPN Transistor. More details for BC848A-AQ can be seen below.