The BTD2444N3-R-T1-G from Cystech Electronics is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 1 V, Emitter Cut off Current 0.5 µA, Collector Base Voltage 40 V, Collector Cut off Current 0.5 µA. Tags: Surface Mount, NPN Transistor. More details for BTD2444N3-R-T1-G can be seen below.