The BC849B_R1_00001 from PANJIT Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.7 to 0.9 V, Emitter Cut off Current 100 nA, Collector Base Voltage 30 V, Collector Cut off Current 0.015 to 5 µA. Tags: Surface Mount, NPN Transistor. More details for BC849B_R1_00001 can be seen below.