The BC549CBK 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 4 µA, Collector Base Voltage 30 V, Collector Cut off Current 4 µA. Tags: Through Hole, NPN Transistor. More details for BC549CBK can be seen below.