This part is a kind of semiconductor called D2544.

Function of this product has 2SD2544.

Manufacturers : Panasonic Semiconductor

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Some of the text within the PDF file :

Power Transistors 2SD2544 Silicon NPN triple diffusion planar type For power amplification with high forward current transfer ratio Unit: mm s Features 13.0±0.2 4.2±0.2 5.0±0.1 10.0±0.2 1.0 q q q 2.5±0.2 High foward current transfer ratio hFE Satisfactory linearity of foward current transfer ratio hFE Allowing supply with the radial taping (TC=25˚C) Ratings 60 60 7 8 4 15 2 150 –55 to +150 Unit V V V A A W ˚C ˚C 90° 1.2±0.1 18.0±0.5 Solder Dip s Absolute Maximum Ratings Parameter Collector to base voltage Collector to emitter voltage Emitter to base voltage Peak collector current Collector current Collector power TC=25°C dissipation Ta=25°C Junction temperature Storage temperature Symbol VCBO VCEO VEBO ICP IC PC Tj Tstg C1.0 2.25±0.2 0.35±0.1 0.65±0.1 1.05±0 [ ... ]

D2544 PDF Datasheet Download