This part is a kind of semiconductor called UPC2002.

Function of this product has Audio Power Amplifier.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

w w a D . w S a t e e h U 4 t m o .c w w w t a .D S a e h U 4 t e .c m o w w w .D a S a t e e h U 4 t m o .c [ ... ]

UPC2002 PDF Datasheet Download