Article The MOSFETs on the TMC5160 SilentStepStick are rated to 12A but the rated current by Trinamic is 3A RMS, why is it not 12A?

The 3A RMS current rating is due to thermal considerations, as the PCB is rather small it cannot disssipate much heat. On the TMC5160 SilentStepStick product page, you can find an excel "Calculation Sheet" which allows you to calculate power dissipation from various factors - link below:

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