I have no idea that the part should be. There are literally thousands of different chips in that particular package type. May not even be a MOSFET. You would need the old part to see if you can get a number off it to search on, but usually small parts like that only have a package code on them, not enough to do a search for a suitable replacement. The only other option would be to get a hold of a circuit schematic and those are generally pretty guarded for consumer electronics.