This part is a kind of semiconductor called E13003.

Function of this product has POWER TRANSISTOR.

Manufacturers : Daesan Electronics

Image and pinout :

Some of the text within the PDF file :

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

E13003 PDF Datasheet Download