This part is a kind of semiconductor called WPM9435.
Function of this product has P-Channel Enhancement Mode MOSFET.
Manufacturers : WillSEMI
Image and pinout :

Some of the text within the PDF file :
WPM9435 WPM9435 P-Channel Enhancement Mode MOSFET www.willsemi.com Description The WPM9435 is the P-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 power management and other battery powered circuits where high-side switching. Features z z z z z -30V/-5A,RDS(ON)= 36m@VGS=- 10V -30V/-4A,RDS(ON)= 53m@VGS=-4.5V Super high density cell design for extremely low RDS (ON) Exceptional on-resistance and maximum DC current capability SOP – 8P package design D D D D Application z z z z z Power Management in Note book Portable Equipment Battery Powe [ ... ]
WPM9435 PDF Datasheet Download
