This part is a kind of semiconductor called D1266.

Function of this product has 2SD1266.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SD1266, 2SD1266A Silicon NPN triple diffusion planar type For power amplification Complementary to 2SB941 and 2SB941A s Features q q q Unit: mm 0.7±0.1 10.0±0.2 5.5±0.2 2.7±0.2 4.2±0.2 φ3.1±0.1 1.4±0.1 1.3±0.2 0.8±0.1 0.5 +0.2 –0.1 2.54±0.25 5.08±0.5 1 2 3 4.2±0.2 (TC=25˚C) Ratings 60 80 60 80 6 5 3 35 2 150 –55 to +150 Unit Parameter Collector to base voltage Collector to 2SD1266 2SD1266A 2SD1266 Symbol VCBO VCEO VEBO ICP IC PC Tj Tstg 14.0±0.5 emitter voltage 2SD1266A Emitter to base voltage Peak collector current Collector current Collector power TC=25°C dissipation Ta=25°C Junction temperature Storage temperature V V A A W ˚C ˚C www.DataSheet.co.kr Solder Dip 4.0 V 16.7±0.3 s Absolute Maximum Ratings 7.5±0.2 High forward curre [ ... ]

D1266 PDF Datasheet Download