This part is a kind of semiconductor called STK4853.
Function of this product has (STK4852 / STK4853) 2-CHANNEL 10 TO 50W MIN AF POWER AMP.(DUAL-SUPPLY).
Manufacturers : ETC
Image and pinout :
Some of the text within the PDF file :
DataSheet 4 U .com [ ... ]
STK4853 PDF Datasheet Download
