This part is a kind of semiconductor called APM2509NF.

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 :

APM2509NF N-Channel Enhancement Mode MOSFET Features • 25V/50A , RDS(ON)=7.5mΩ (typ.) @ VGS=10V RDS(ON)=13mΩ (typ.) @ VGS=4.5V Pin Description • • • • Super High Dense Cell Design Avalanche Rated Reliable and Rugged Lead Free Available (RoHS Compliant) Top View of TO-220 D Applications G • Power Management in Computer or SPS Systems S N-Channel MOSFET Ordering and Marking Information APM2509N Lead Free Code Handling Code Temp. Range Package Code Package Code F : TO-220 Operating Junction Temp. Range C : -55 to 150° C Handling Code TU : Tube Lead Free Code L : Lead Free Device XXXXX - Date Code APM2509N F : APM2509N XXXXX Note: ANPEC lead-free products contain molding compounds and 100% matte tin plate termination finish; which are fully compliant with RoHS and [ ... ]

APM2509NF PDF Datasheet Download