Microstep Stepper Motor Driver DM860A 2-phase 24-80VDC Max 7.8A

Key Features:
  • Power Supply: 24-80 VDC
  • Maximum current: 7.8 A
  • Microstep resolution: 400-51200 pulse/turn
  • Pulse Input Frequency: 0~200kHz


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DM860A is a two-phase hybrid stepping motor driver, The drive voltage of which is from 24VDC to 80VDC. It is designed for use with 2-phase hybrid stepper motor of all kinds, especially Nema 34, with less than 7.8A phase current. This circuit that it adopts is similar to the circuit of servo control which enables the motor run smoothly without noise and vibration. Holding torque when DM860A run under high speed is also significantly higher than the other two-phase driver, what’s more, the positioning accuracy is also higher. It is widely used in middle and big size numerical control devices such as curving machine, CNC machine, computer embroider machine, packing machines and so on.

Key Features:

  • High performance
  • Average current control, 2-phase sinusoidal output current drive
  • Supply voltage from 24VDC to 80VDC
  • Maximum drive current 7.8 A
  • Standby current can be set to half
  • Opto-isolated signal I/O
  • Overvoltage, under voltage, overcurrent, phase short circuit protection
  • 14 channels microstep subdivision from 400 to 51200 and automatic idle-current reduction
  • 8 channels output phase current setting
  • Motor torque is related with speed, but not related with step/revolution
  • High start speed
  • High holding torque under high speed
  • Opto-isolated input/output signals


Signal interface details:

Controller’s control signals can be active in high or low electrical level. When the high electrical level is active (common cathode connection), all control negative signals will be connected together to GND. When the low electrical level is active (common anode connection), all control positive signals will be connected together to public port. See pictures below for details:

  • Common cathode connection

  • Common anode connection

You can use 5 – 24 V signal of a controller, just make sure that the appropriate resistor is used:

Signal amplitude External current limiting resistor R
5V Without R
12V 1kΩ
24V 2kΩ


Motor and power supply interface details:

Motor pins A+ 4 wires of a motor must be connected. In most situations those wires are color coded. Color associated with a winding depends on the motor. Please refer to the motor’s documentation for details.
Power supply pins DC+ Power supply: 24-80 VDC


Power Supply

24-80 VDC

Maximum current

7.8 A

Microstep resolution

400-51200 pulse/turn

Pulse Input Frequency


Operating Temperature