View irfz34n datasheet:

PD -9.1276C IRFZ34N HEXFET® Power MOSFET Advanced Process Technology D Ultra Low On-Resistance VDSS = 55V Dynamic dv/dt Rating 175°C Operating Temperature RDS(on) = 0.040? Fast Switching G Ease of Paralleling ID = 29A Description S Fifth Generation HEXFETs from International Rectifier utilize advanced processing techniques to achieve the lowest possible 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 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 low th