This part is a kind of semiconductor called APM2055N.

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

Manufacturers : Etc

Image and pinout :

Some of the text within the PDF file :

APM2055N N-Channel Enhancement Mode MOSFET Features • 20V/12A, RDS(ON)=55mΩ(typ.) @ VGS=10V RDS(ON)=75mΩ(typ.) @ VGS=4.5V RDS(ON)=140mΩ(typ.) @ VGS=2.5V Pin Description • • • Super High Dense Cell Design High Power and Current Handling Capability TO-252 and SOT-223 Packages 1 2 3 1 2 3 G D S G D S Top View of TO-252 D Top View of SOT-223 Applications • • Switching Regulators Switching Converters G Ordering and Marking Information A P M 2 055 N H a n d lin g C o d e Tem p. R ange Package C ode S N-Channel MOSFET Package C ode U : T O -2 5 2 V : S O T -2 2 3 O p e ra tio n J u n c tio n T e m p . R a n g e C : -5 5 to 1 5 0 ° C H a n d lin g C o d e TR : Tape & R eel AP M 2055N U : AP M 2055N XXXXX XXXXX - D a te C o d e AP M 2055N V : AP M 205 [ ... ]

APM2055N PDF Datasheet Download