This part is a kind of semiconductor called 2SC2097.
Function of this product has HG RF POWER TRANSISTOR.
Manufacturers : HGSemi
Image and pinout :

Some of the text within the PDF file :
HG HG RF POWER TRANSISTOR Semiconductors ROHS Compliance,Silicon NPN POWER TRANSISTOR 2SC2097 Note : Above parameters , ratings , limits and conditions are subject to change Sep. 1998 www.HGSemi.com [ ... ]
2SC2097 PDF Datasheet Download
