PN00218-CYT7 Cytron 20A 6-30V DC Motor Driver MD20A


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The MD20A enables bidirectional control of one high-power brushed DC motor from 6V to 30V. With discrete NMOS H-Bridge design, this motor driver is able to support 20Amp continuously without any heatsink.

The onboard test buttons and motor output LEDs allow functional test of the motor driver in a quick and convenient way without hooking up the host controller.

This motor driver can be controlled with PWM and DIR inputs. With input logic voltage range from 1.8V to 12V, it’s compatible with wide variety of host controller (e.g. Arduino, Raspberry Pi, PLC).

Various protection features are also incorporated in the MD20A. Overcurrent protection prevents the motor driver from damage when the motor stalls or an oversized motor is hooked up. When the motor is trying to draw current more than what the motor driver can support, the motor current will be limited at the maximum threshold.

Assisted by temperature protection, the maximum current limiting threshold is determined by the board temperature. The higher the board temperature, the lower the current limiting threshold. This way, MD20A able to deliver its full potential depending on the actual condition without damaging the MOSFETs.

Note: Power input does not have reverse-voltage protection. Connecting the battery in reverse polarity will damage the motor driver instantaneously.



  • Bidirectional control for one brushed DC motor.
  • Operating Voltage: DC 6V to 30V
  • Maximum Motor Current: 20A continuous, 60A peak
  • Buttons for quick testing.
  • LEDs for motor output state.
  • PWM and DIR inputs.
  • Inputs compatible with 1.8V, 3.3V, 5V and 12V logic (Arduino, Raspberry Pi, PLC, etc).
  • PWM frequency up to 20kHz (Output frequency is same as input frequency).
  • Compatible with sign-magnitude and locked-antiphase PWM operation.
  • Overcurrent protection with active current limiting.
  • Temperature protection.
  • Undervoltage shutdown.

Example Applications: Automated Guided Vehicle (AGV), Solar Tracker, Game Simulator, Mobile Robot, Automation Machine.


User Manual


7 Reviews Hide Reviews Show Reviews

  • 5
    Works great!

    Posted by Matt Smith on Mar 15th 2024

    I picked up a pair of these after burning out some cheap-o (but not actually that cheap) ones from Amazon. These worked perfectly, with minimal heat even after 5-10 mins of constant use at 24V 5A. Plus the buttons to test made it a lot easier to check connections and motor direction. Would definitely buy again!

  • 4
    Great driver, but I wish it had breaking

    Posted by Matt on Oct 23rd 2023

    The Driver is great! Perfect for high voltage and current applications. My only complaint is that it claims to have a "break" state, but if you check the logic diagram it is not actually breaking. E-breaking would require both outputs to go hot, in the documentation it lists both outputs Low as the break which should just result in free spinning with only the limited resistance of the motor pushing back.

  • 5
    DC Motor driver

    Posted by Ira Hughes on Aug 29th 2022

    The product worked exactly as described. I really like the buttons on the board so you can test the motor driver to know its wired write and everything is working before sending over the PWN commands via Arduino which was also very easy to get working.

  • 5
    I run two of these with an Arduino for dual motor control. I've tried other brands of controllers and I don't think you'll find anything as good for the price.

    Posted by Leonard Dawson on Aug 8th 2022

    I also have the MDD10 and the MDD30. For some applications I control them with an Arduino. For others I use a Spectrum RF transmitter and receiver. The MMD30 costs more but it supplies power to the Arduino and will also work with RF components. I am using two of the MD20As with an Arduino for dual motor control. For testing, I don't mind supplying my own power to the Arduino., and these units are cheaper than the MDD30 controller.

  • 5
    Easy-peasy works right out of the box

    Posted by Eric Wampner on Jan 29th 2022

    Got this to control a 12VDC electric cooler that can be reversed to do heating, the supply for the cooler is 6 amps so I wanted something more beefy than an L298. Worked right the first them, terminals are a joy to use, built-in LEDs make it easy to see what should be happening. Worth every penny.

  • 5
    Great DC Motor Controller with Reverse

    Posted by Robert Lee on Sep 27th 2020

    Great DC motor controller. Good documentation (physical and electrical), well designed. The test buttons are useful. My go-to.

  • 5
    Pancake Motor/Generator

    Posted by Louis DiFrancesco on Jun 16th 2020

    We miswired many H Bridge controllers until we spent a few dollars to get this production proven system. Being "cheap" cost us more in parts & time then getting this product the first time.