This part is a kind of semiconductor called 2SC1968.
Function of this product has Silicon NPN POWER TRANSISTOR.
Manufacturers : HGSemi
Image and pinout :

Some of the text within the PDF file :
HG Semiconductors 2SC1968HG RF POWER TRANSISTOR ROHS Compliance,Silicon NPN POWER TRANSISTOR Note : Above parameters , ratings , limits and conditions are subject to change www.HGSemi.com Sep. 1998 [ ... ]
2SC1968 PDF Datasheet Download
