This part is a kind of semiconductor called 2SK1020.

Function of this product has (2SKxxxx) MOSFETs.

Manufacturers : Fuji Semiconductors

Image and pinout :

Some of the text within the PDF file :

Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ [ ... ]

2SK1020 PDF Datasheet Download