This part is a kind of semiconductor called AO4455.

Function of this product has 30V P-Channel MOSFET.

Manufacturers : Alpha & Omega Semiconductors

Image and pinout :

Some of the text within the PDF file :

NTQtu5[PgPQlSł www.whxpcb.com AO4455 30V P-Channel MOSFET General Description The AO4455 uses advanced trench technology to provide excellent RDS(ON), and ultra-low low gate charge with a 25V gate rating. This device is suitable for use as a load switch or in PWM applications. Product Summary VDS (V) = -30V ID = -17A RDS(ON) < 6.2mΩ RDS(ON) < 7.2mΩ ESD Protected 100% UIS tested 100% Rg tested (VGS = -20V) (VGS = -20V) (VGS = -10V) * RoHS and Halogen-Free Complaint SOIC-8 Top View D D D D Bottom View D G G S S S S Absolute Maximum Ratings TA=25° C unless otherwise noted Parameter Symbol VDS Drain-Source Voltage Maximum -30 ±25 -17 -14 -182 3.1 2 -55 to 150 Units V V A Gate-Source Voltage Continuous Drain Current AF Pulsed Drain Current B TA=25° C Power Dissipation A TA= [ ... ]

AO4455 PDF Datasheet Download