This part is a kind of semiconductor called IRF3205.

Function of this product has Power MOSFET(Vdss=55V/ Rds(on)=8.0mohm/ Id=110A).

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD-91279E IRF3205 HEXFET® Power MOSFET l l l l l l Advanced Process Technology Ultra Low On-Resistance Dynamic dv/dt Rating 175°C Operating Temperature Fast Switching Fully Avalanche Rated D VDSS = 55V RDS(on) = 8.0mΩ G S ID = 110A… Description Advanced HEXFET® Power MOSFETs from International Rectifier utilize advanced processing techniques to achieve extremely low on-resistance per silicon area. This benefit, combined with the fast switching speed and ruggedized device design that HEXFET power MOSFETs are well known for, provides the designer with an extremely efficient and reliable device for use in a wide variety of applications. The TO-220 package is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts. The [ ... ]

IRF3205 PDF Datasheet Download