This part is a kind of semiconductor called C2258.

Function of this product has 2SC2258.

Manufacturers : Panasonic

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Some of the text within the PDF file :

Power Transistors 2SC2258 Silicon NPN triple diffusion planar type For high breakdown voltage general amplification ■ Features • High collector-emitter voltage (Base open) VCEO • High transition frequency fT • TO-126B package which requires no insulation plate for installation to the heat sink φ 3.16±0.1 8.0+0.5 –0.1 Unit: mm 3.2±0.2 3.8±0.3 11.0±0.5 1.9±0.1 ■ Absolute Maximum Ratings Ta = 25°C Parameter Collector-base voltage (Emitter open) Collector-emitter voltage (Base open) Emitter-base voltage (Collector open) Collector current Peak collector current Collector power dissipation Symbol VCBO VCEO VEBO IC ICP PC Tj Tstg Rating 250 250 7 100 150 1.2 *1 4 Junction temperature Storage temperature *2 Unit V V V mA mA W °C °C 1 2 0.75±0.1 4.6 [ ... ]

C2258 PDF Datasheet Download