This part is a kind of semiconductor called AOD478.

Function of this product has 100V N-Channel MOSFET.

Manufacturers : Alpha & Omega Semiconductors

Image and pinout :

Some of the text within the PDF file :

AOD478/AOI478 100V N-Channel MOSFET General Description The AOD478/AOI478 combines advanced trench MOSFET technology with a low resistance package to provide extremely low RDS(ON). This device is ideal for boost converters and synchronous rectifiers for consumer, telecom, industrial power supplies and LED backlighting. Product Summary VDS ID (at VGS=10V) RDS(ON) (at VGS=10V) RDS(ON) (at VGS = 4.5V) 100V 11A < 140mΩ < 152mΩ 100% UIS Tested 100% Rg Tested TO252 DPAK Top View D D Bottom View Top View TO251A IPAK Bottom View D S G S G S D G S D G G S Absolute Maximum Ratings TA=25° C unless otherwise noted Parameter Symbol Drain-Source Voltage VDS Gate-Source Voltage Continuous Drain Current Pulsed Drain Current Continuous Drain Current Avalanche Current C Avalanche energy L=0.1 [ ... ]

AOD478 PDF Datasheet Download