The BC337-40 from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 0.1 to 10 µA, Collector Cut off Current 0.1 to 10 µA, Collector Emitter Voltage 45 V, Continuous Collector Current 800 mA. Tags: Through Hole, NPN Transistor. More details for BC337-40 can be seen below.