This part is a kind of semiconductor called 2SD2499.

Function of this product has SILICON DIFFUSED POWER TRANSISTOR(GENERAL DESCRIPTION).

Manufacturers : Wing Shing Computer Components

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Some of the text within the PDF file :

2SD2499 GENERAL DESCRIPTION SILICON DIFFUSED POWER TRANSISTOR Highvoltage,high-speed switching npn transistors in a plastic envelope with integrated efficiency diode,primarily for use in horizontal deflection circuites of colour television receivers QUICK REFERENCE DATA SYMBOL TO-3PM CONDITIONS VBE = 0V MIN VCESM VCEO IC ICM Ptot VCEsat Icsat VF tf PARAMETER Collector-emitter voltage peak value Collector-emitter voltage (open base) Collector current (DC) Collector current peak value Total power dissipation Collector-emitter saturation voltage Collector saturation current Diode forward voltage Fall time Tmb 25 IC = 4.0A; IB = 0.8A f = 16KHz IF = 4.0A ICsat = 4.0A; f = 16KHz 1.5 MAX 1500 600 5 10 50 5 2.0 1.0 UNIT V V A A W V A V s LIMITING VALUES SYMBOL VCESM VCEO IC ICM IB IBM [ ... ]

2SD2499 PDF Datasheet Download