This part is a kind of semiconductor called AO4400.

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 :

July 2001 AO4401 P-Channel Enhancement Mode Field Effect Transistor General Description The AO4401 uses advanced trench technology to provide excellent RDS(ON), low gate charge and operation with gate voltages as low as 2.5V. This device is suitable for use as a load switch or in PWM applications. Features VDS (V) = -30V ID = -6.1 A RDS(ON) < 46mΩ (VGS = -10V) RDS(ON) < 61mΩ (VGS = -4.5V) RDS(ON) < 117mΩ (VGS = -2.5V) SOIC-8 Top View SD SD SD GD D G S Absolute Maximum Ratings TA=25°C unless otherwise noted Parameter Symbol Drain-Source Voltage VDS Gate-Source Voltage VGS Continuous Drain TA=25°C Current A TA=70°C Pulsed Drain Current B ID IDM TA=25°C Power Dissipation A TA=70°C Junction and Storage Temperature Range PD TJ, TSTG Maximum -30 ±12 -6.1 -5.1 -60 [ ... ]

AO4400 PDF Datasheet Download