This part is a kind of semiconductor called AON7700.

Function of this product has N-Channel Enhancement Mode Field Effect Transistor.

Manufacturers : Alpha & Omega Semiconductors

Image and pinout :

Some of the text within the PDF file :

AON7700 30V N-Channel MOSFET SRFET TM General Description Product Summary SRFETTM AON7700 uses advanced trench technology with a monolithically integrated Schottky diode to provide excellent RDS(ON),and low gate charge. This device is suitable for use as a low side FET in SMPS, load switching and general purpose applications. VDS ID (at VGS=10V) RDS(ON) (at VGS=10V) RDS(ON) (at VGS=4.5V) 30V 40A < 7.2mΩ < 8.6mΩ 100% UIS Tested 100% Rg Tested DFN 3x3 EP Top View Bottom View Pin 1 Top View 18 27 36 45 G D SRFETTM Soft Recovery MOSFET: Integrated Schottky Diode S Absolute Maximum Ratings TA=25°C unless otherwise noted Parameter Symbol Drain-Source Voltage VDS Gate-Source Voltage VGS Continuous Drain TC=25°C Current G TC=100°C Pulsed Drain Current C ID IDM Cont [ ... ]

AON7700 PDF Datasheet Download