This part is a kind of semiconductor called IRFZ34N.

Function of this product has Power MOSFET.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD -9.1276C IRFZ34N HEXFET® Power MOSFET Advanced Process Technology Ultra Low On-Resistance l Dynamic dv/dt Rating l 175°C Operating Temperature l Fast Switching l Ease of Paralleling Description l l D VDSS = 55V G S RDS(on) = 0.040Ω ID = 29A 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 thermal resis [ ... ]

IRFZ34N PDF Datasheet Download