This part is a kind of semiconductor called BSP52T1G.

Function of this product has NPN Small-Signal Darlington Transistor.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

BSP52T1G, BSP52T3G NPN Small-Signal Darlington Transistor This NPN small signal Darlington transistor is designed for use in switching applications, such as print hammer, relay, solenoid and lamp drivers. The device is housed in the SOT-223 package, which is designed for medium power surface mount applications. Features • The SOT-223 Package can be soldered using wave or reflow. The formed leads absorb thermal stress during soldering, eliminating the possibility of damage to the die • Available in 12 mm Tape and Reel Use BSP52T1 to Order the 7 Inch/1000 Unit Reel • PNP Complement is BSP62T1 • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant MAXIMUM RATINGS (TC = 25°C unless otherwise noted) Rating Symbol Max Unit Collector-Emitter Voltage Collector- [ ... ]

BSP52T1G PDF Datasheet Download