This part is a kind of semiconductor called SM4370NSKP.
Function of this product has N-Channel Enhancement Mode MOSFET.
Manufacturers : Sinopower
Image and pinout :
Some of the text within the PDF file :
SM4370NSKP Features · 30V/50A, RDS(ON)=8.4mW (max.) @ VGS=10V RDS(ON)=12.6mW (max.) @ VGS=4.5V · Reliable and Rugged · Lead Free and Green Devices Available (RoHS Compliant) ® N-Channel Enhancement Mode MOSFET Pin Description DDDD S S SG DFN5x6-8 D (5, 6) Pin 1 Applications · Power Management in Desktop Computer or DC/DC Converters. G (4) S (1, 2, 3) N-Channel MOSFET Ordering and Marking Information SM4370NS Assembly Material Handling Code Temperature Range Package Code Package Code KP : DFN5x6-8 Operating Junction Temperature Range C : -55 to 150 oC Handling Code TR : Tape & Reel (2500ea/reel) Assembly Material G : Halogen and Lead Free Device SM4370NS KP : SM4370 XXXXX XXXXX - Lot Code Note : SINOPOWER lead-free products contain molding compounds/die attach materials a [ ... ]