The BTB1590S3-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 -100 nA, Collector Base Voltage -40 V, Collector Cut off Current -100 nA. Tags: Surface Mount, PNP Transistor. More details for BTB1590S3-R-T1-G can be seen below.