voltage conversion

What should I do or which mosfet should I use that can take input of 3.3 v and can regulate the devices that requires higher voltages ...I know IRFz44 requires 5 V to operate and control the device that requires higher voltage..But I need a mosfet which can take input of 3.3 V and can regulate the device of higher voltage...Any help ...

Try this one. http://www.digikey.com/product-detail/en/FDN335N/FDN335NCT-ND/965601 I don't know of any thru hole parts with low Vgs