Hey
Driving a DC Brushed motor via PWM, basically i am using a IRF520 HEXFET however it the max Ids is 9A, the motor Iam using is less then 1Amp, could i possibly move to the IRFL014N it is a 2Amp Hexfet, is it possible that the 520 is more robust against voltage spikes transients caused by the motor switching?

Thanks

 

Are you sure your motor doesn't require a bit of extra starting current? Running and current required to overcome inertia are two different ratings that can differ significantly. If it isn't for a high volume application, then just go a bit overkill just in case.

Also, just because a device is rated at a current, doesn't mean it can handle it. You need to check RDSon of the FET and ensure that your P=I^2*R losses can be dealt with. Also, robustness against transients is linked to maximum Vgs of the FET, not current rating. If you are expecting high transients, then use a snubber.

Steve