This part is a kind of semiconductor called 2SA1142.

Function of this product has PNP SILICON POWER TRANSISTOR.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

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

2SA1142 PDF Datasheet Download