This part is a kind of semiconductor called C5243.

Function of this product has 2SC5243.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SC5243 Silicon NPN triple diffusion mesa type For horizontal deflection output 20.0±0.5 Unit: mm φ 3.3±0.2 5.0±0.3 3.0 6.0 s Features q q q 1.5 1.5 Solder Dip s Absolute Maximum Ratings Parameter Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Peak collector current 20.0±0.5 2.5 2.0±0.3 3.0±0.3 1.0±0.2 (TC=25˚C) Ratings 1700 1700 6 15 30 10 200 3.5 150 –55 to +150 Unit V V V A A A W ˚C ˚C 2.7±0.3 Symbol VCBO VCES VEBO IC ICP* IBP PC Tj Tstg 0.6±0.2 5.45±0.3 10.9±0.5 1 2 3 1:Base 2:Collector 3:Emitter TOP–3L Package Peak base current Collector power TC=25°C dissipation Ta=25°C Junction temperature Storage temperature *Non-repetitive peak s Electrical Characteris [ ... ]

C5243 PDF Datasheet Download