This part is a kind of semiconductor called D1275.

Function of this product has 2SD2715.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SD1275, 2SD1275A Silicon NPN triple diffusion planar type darlington For power amplification Complementary to 2SB0949 and 2SB0949A 10.0±0.2 5.5±0.2 Unit: mm 4.2±0.2 2.7±0.2 4.2±0.2 16.7±0.3 7.5±0.2 0.7±0.1 ■ Features • High forward current transfer ratio hFE • High-speed switching • Full-pack package which can be installed to the heat sink with one screw ■ Absolute Maximum Ratings Ta = 25°C Parameter Symbol Rating Unit Collector-base voltage (Emitter open) 2SD1275 VCBO 2SD1275A 60 80 V Collector-emitter voltage 2SD1275 VCEO (Base open) 2SD1275A 60 80 V Emitter-base voltage (Collector open) Collector current Peak collector current Collector power dissipation TC = 25°C Junction temperature Storage temperat [ ... ]

D1275 PDF Datasheet Download