This part is a kind of semiconductor called 2SD1710.

Function of this product has Silicon Diffused Power Transistor.

Manufacturers : Wing Shing Computer Components

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Some of the text within the PDF file :

2SD1710 GENERAL DESCRIPTION Silicon Diffused Power Transistor Highvoltage,high-speed switching npn transistors in a plastic package,pimarily for use in horizontal deflection circuites of colour television receivers QUICK REFERENCE DATA SYMBOL TO-3PML CONDITIONS VBE = 0V TYP 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 = 1.0A f = 16KHz IF = 4.5A ICsat = 4.5A; f = 16KHz 1.6 0.5 MAX 1500 600 5 10 50 5.0 2.0 1.0 UNIT V V A A W V A V s LIMITING VALUES SYMBOL VCESM VCEO IC ICM IB IBM Ptot Tstg Tj PARAMETER Coll [ ... ]

2SD1710 PDF Datasheet Download