This part is a kind of semiconductor called 2SK61.

Function of this product has Silicon N-Channel Junction FET.

Manufacturers : ETC

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

2SK61 PDF Datasheet Download