But which MOSFET are you trying to replace?? Without knowing that we cannot guess the values of the "crucial parameters"...
Max current is still the same though, might be worth it to try to find something more robust. Is there enough room to mount something a little larger than SOT-23? Eg,http://www.digikey.com/product-detail/en/STB60NF10T4/497-7951-1-ND/1883514
what makes you think its a MOSFET?
We need the circuit or as much description as possible. I fly helis and we have a lot of problems with escs failing. Unfortunately most escs do not control their max current and just rely on things working as normal, but in fault conditions the current can go to very high values. Is the motor brushless or brushed. If brushless you will probably have other fets that are damaged as they are connected in three bridge circuits.
The footprint only allows something like the SOT-23. Although I have a little flexibility in this as one of the pads was burned away. I think the configuration of the STM MOFSET is too big.
...that might not mean the replacement has to be soldered in exactly the same way. Eg, mount it up a bit and solder 3 wires,etc. Jury rigs aren't always pretty, especially if they replace a marginal design withsomething a lot better. The MOSFET I cited is tiny in comparison to a TO-220.It was just a thought.
My other issue is that up until a few days ago I didn't even know what a MOSFET was or how they work.