This part is a kind of semiconductor called 2SA2125.

Function of this product has Bipolar Transistor.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

Ordering number : EN7988B 2SA2125/2SC5964 Bipolar Transistor (–)50V, (–)3A, Low VCE(sat), (PNP)NPN Single PCP http://onsemi.com Applicaitons • DC / DC converter, relay drivers, lamp drivers, motor drivers, flash Features • Adoption of MBIT process • Low collector to emitter saturation voltage • Halogen free compliance • Large current capacity • High-speed switching Specifications ( ) : 2SA2125 Absolute Maximum Ratings at Ta=25°C Parameter Symbol Collector to Base Voltage Collector to Emitter Voltage Emitter to Base Voltage VCBO VCES VCEO VEBO Conditions Ratings (-50)100 (-50)100 (--)50 (--)6 Unit V V V V Continued on next page. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the [ ... ]

2SA2125 PDF Datasheet Download