This part is a kind of semiconductor called APM3055LU.

Function of this product has N-Channel Enhancement Mode MOSFET.

Manufacturers : Anpec Electronics Coropration

Image and pinout :

Some of the text within the PDF file :

APM3055LU N-Channel Enhancement Mode MOSFET Features • 30V/20A, RDS(ON)=75mΩ (typ.) @ VGS=10V RDS(ON)=100mΩ (typ.) @ VGS=4.5V Pin Description G D • Super High Dense Cell Design • Reliable and Rugged • Lead Free Available (RoHS Compliant) S Top View of TO-252 D Applications • Power Management in Desktop Computer or DC/DC Converters G S N-Channel MOSFET Ordering and Marking Information APM3055L Lead Free Code Handling Code Temp. Range Package Code Package Code U : TO-252 Operating Junction Temp. Range C : -55 to 150° C Handling Code TU : Tube TR : Tape & Reel Lead Free Code L : Lead Free Device Blank : Original Device XXXXX - Date Code APM3055L U : APM3055L XXXXX Note: ANPEC lead-free products contain molding compounds and 100% matte tin plate [ ... ]

APM3055LU PDF Datasheet Download