Adding diodes in stepper motor wiring path

The chip used in the x-controller I think has BOTH h-drives on ONE chip and thus if you look at the description on the Mouser page you see it described as a stepper motor driver. I seem to remember that they used to be called “dual H-drives”. I do know that old dual H-drive chips (also on one chip) had to be accompanied by a control chip (separate) Anyway, I think this subject has been beat to death. If someone wants to try to diode protect their equipment, it probably could be done, just not in the 4 wires that lead to the motor.

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Diodes no. Bi directional TVS’s are used in some motor controllers This is a complex subject. If the TB6600 is being used with small to mid size NEMA 23’s and drive voltage under 36 volt and actual under 30 with large inductance, don’t worry about it. If you want to drive the large NEMA 23’s and larger steppers at higher voltages then a single chip design is not for you. There are many stepper drivers that use 2 discrete h bridges and bridge drivers that are more robust and designed to control higher voltages, current and inductance. No, a 15$ Ebay TB6600 is not going to do it for the big stuff.