The BC848BT from Galaxy Century Microelectronics is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.7 to 1.1 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 30 V, Collector Cut off Current 5 µA. Tags: Surface Mount, NPN Transistor. More details for BC848BT can be seen below.