This part is a kind of semiconductor called APM3055L.

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

Manufacturers : ANPEC

Image and pinout :

Some of the text within the PDF file :

APM3055L N-Channel Enhancement Mode MOSFET Features Pin Description • 30V/12A, RDS(ON)=100mΩ(max) @ V =10V GS RDS(ON)=200mΩ(max) @ VGS=4.5V • Super High Dense Cell Design • High Power and Current Handling Capability • TO-252 and SOT-223 Packages Applications • Switching Regulators • Switching Converters 123 GD S Top View of TO-252 1 23 G DS Top View of SOT-223 Ordering and Marking Information APM3055L AP M 3055L U /V : APM3055L XXXXX H andling C ode Temp. Range Package Code Package Code U : TO -252 V : SO T-223 O peration Junction Tem p. Range C : -55 to 150° C H andling C ode TR : Tape & Reel XXXXX - Date Code Absolute Maximum Ratings (TA = 25°C unless otherwise noted) Symbol VDSS VGSS ID IDM Parameter Drain-Source Voltage Gate-Source Voltag [ ... ]

APM3055L PDF Datasheet Download