The BL2515DW from Galaxy Century Microelectronics is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 1.1 V, Emitter Cut off Current 100 nA, Collector Base Voltage 20 V, Collector Cut off Current 100 nA. Tags: Surface Mount, NPN Transistor. More details for BL2515DW can be seen below.