This part is a kind of semiconductor called D2137.

Function of this product has 2SD2137.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SD2137, 2SD2137A Silicon NPN triple diffusion planar type For power amplification Complementary to 2SB1417 and 2SB1417A Unit: mm s Features q q q High forward current transfer ratio hFE which has satisfactory linearity Low collector to emitter saturation voltage VCE(sat) Allowing supply with the radial taping 13.0±0.2 4.2±0.2 5.0±0.1 10.0±0.2 1.0 s Absolute Maximum Ratings Parameter Collector to base voltage Collector to 2SD2137 2SD2137A 2SD2137 Symbol VCBO VCEO VEBO ICP IC PC Tj Tstg (TC=25˚C) Ratings 60 80 60 80 6 5 3 15 2 150 –55 to +150 Unit V 90° 2.5±0.2 1.2±0.1 C1.0 2.25±0.2 18.0±0.5 Solder Dip 0.35±0.1 0.65±0.1 1.05±0.1 0.55±0.1 emitter voltage 2SD2137A Emitter to base voltage Peak collector current Collector curre [ ... ]

D2137 PDF Datasheet Download