This part is a kind of semiconductor called 2SJ50.

Function of this product has LOW FREQUENCY POWER AMPLIFIER.

Manufacturers : Hitachi Semiconductor

Image and pinout :

Some of the text within the PDF file :

This Material Copyrighted By Its Respective Manufacturer This Material Copyrighted By Its Respective Manufacturer This Material Copyrighted By Its Respective Manufacturer [ ... ]

2SJ50 PDF Datasheet Download