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If you want to use it for an H-Bridge or motor control, you want it PWM optimized.For example, suppose you are going to use 12V motors that use 5A of current.That means your mosfets should be rated higher than 12V and higher than 60W of power.Of course you probably can get one rated for 40W of power, and put a big heat sink on your mosfet too . . .
The resistance of two equal MOSFETs is half the original value