View irfz48n datasheet:

PD - 91406 IRFZ48N HEXFET® Power MOSFET Advanced Process Technology D Ultra Low On-Resistance VDSS = 55V Dynamic dv/dt Rating 175°C Operating Temperature RDS(on) = 14m? Fast Switching G Fully Avalanche Rated ID = 64A S 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.