This part is a kind of semiconductor called ST4828N.

Function of this product has Dual N Channel Enhancement Mode MOSFET.

Manufacturers : Stanson

Image and pinout :

Some of the text within the PDF file :

N ST4828 ST4828N Dual N Channel Enhancement Mode MOSFET 10A DESCRIPTION The ST4828N is the Dual N-Channel logic enhancement mode power field effect transistors are produced using high cell density , DMOS trench technology. This high density process is especially tailored to minimize on-state resistance. These devices are particularly suited for low voltage application , notebook computer Li-ion Battery , power management and other battery powered circuits where high-side switching . PIN CONFIGURATION SOP-8 FEATURE � � � � � 60V/10A, RDS(ON) = 30mΩ (Typ.) @VGS = 10V 60V/6A, RDS(ON) =35mΩ @VGS = 4.5V Super high density cell design for extremely low RDS(ON) Exceptional on-resistance and maximum DC current capability SOP-8 package design [ ... ]

ST4828N PDF Datasheet Download