This part is a kind of semiconductor called APM4546K.

Function of this product has Dual Enhancement Mode MOSFET.

Manufacturers : Anpec Electronics

Image and pinout :

Some of the text within the PDF file :

APM4546K Dual Enhancement Mode MOSFET (N-and P-Channel) Features • N-Channel 30V/7A, RDS(ON) =20mΩ (typ.) @ VGS = 10V RDS(ON) =27mΩ (typ.) @ VGS = 4.5V P-Channel -30V/-5A, RDS(ON) =38mΩ (typ.) @ VGS =-10V RDS(ON) =46mΩ (typ.) @ VGS =-4.5V Pin Description • Top View of SOP − 8 (8) D1 (7) D1 (3) S2 • • • Super High Dense Cell Design Reliable and Rugged Lead Free Available (RoHS Compliant) (2) G1 (4) G2 Applications • Power Management in Notebook Computer, Portable Equipment and Battery Powered Systems S1 (1) D2 (5) D2 (6) N-Channel MOSFET P-Channel MOSFET Ordering and Marking Information APM4546 Lead Free Code Handling Code Temp. Range Package Code APM4546 K : APM4546 XXXXX Package Code K : SOP-8 Operating Junction Temp. Range C : -55 to 15 [ ... ]

APM4546K PDF Datasheet Download