I've been asked to look at a Genius G-12-060 12V 600W inverter
(http://www.atlantasolar.com/product_...-12-060%2012V%
20600W/products_id/416).

All 6 of the mosfets(?) have failed short circuit.

It may not be worth the effort of actually repairing; but just for
giggles I've removed them and I'm trying to find a suitable replacement.

The devices are TO-220 are simply are marked:

F N334AN

The F doesn't look like a Fairchild F, but it appears to be seperate from
the part code.

Anyone have any ideas? or any guesses as to what the missing suffix could
be?