This part is a kind of semiconductor called 2SA2125.

Function of this product has PNP / NPN Epitaxial Planar Silicon Transistors DC / DC Converter Applications.

Manufacturers : Sanyo Semicon Device

Image and pinout :

Some of the text within the PDF file :

Ordering number : ENN7988 2SA2125 / 2SC5964 2SA2125 / 2SC5964 Applications • PNP / NPN Epitaxial Planar Silicon Transistors DC / DC Converter Applications DC / DC converter, relay drivers, lamp drivers, motor drivers, flash. Features • • • • Adoption of MBIT process. High current capacitance. Low collector-to-emitter saturation voltage. High-speed switching. Specifications ( ) : 2SA2125 Absolute Maximum Ratings at Ta=25°C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Current (Pulse) Base Current Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCES VCEO VEBO IC ICP IB PC Tj Tstg Mounted on a ceramic board (250mm2!0.8m) Tc=25°C [ ... ]

2SA2125 PDF Datasheet Download