The 2SB1559 from Sanken Electric is a Bipolar Junction Transistor with Emitter Base Voltage -5 V, Base Emitter Saturation Voltage -3 V, Emitter Cut off Current -100 µA, Collector Base Voltage -160 V, Collector Cut off Current -100 µA. Tags: Through Hole, PNP Transistor. More details for 2SB1559 can be seen below.