The BC817-40_R1_00001 from PANJIT Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 100 nA, Collector Base Voltage 50 V, Collector Cut off Current 0.1 to 5 µA, Collector Emitter Breakdown Voltage 45 V. Tags: Surface Mount, NPN Transistor. More details for BC817-40_R1_00001 can be seen below.