2x40A Motor Controller

This is NOT competition legal in the FIRST® Tech Challenge.

The 2x40A Motor Controller is the peanut butter if the goBILDA® 20V Smart Dock is the jelly! This 2-channel controller is ready to proportionally control the speed and direction of up to two Saturn Planetary Gear Motors per channel. Add the 20V Battery and goBILDA® 20V Smart Dock to that mix to unleash heavy-duty 20V action!

Each of the two channels can handle 40A continuously, and up to 50A peak. Motor control is facilitated safely thanks to temperature, current, and reverse-voltage protections. Status LEDS keep you in the know about the signals received by the motor controller, as well as any current, voltage, or temperature errors. A signal arm zone prevents unintential motion.

The slim footprint allows you to nestle it down inside of your project. The aluminum heatsink doubles as a mounting base, boasting M4 threaded holes on the goBILDA® 8mm grid pattern that allow you to easily fasten it to other goBILDA® components.

Power Input

Supply anywhere from 9-30V to the XT90 connector to power your motors. Though you can send that power from any suitable battery, the goBILDA® 20V Smart Dock has an XT90 output for heavy-duty powering!

Signal Input

Plug an RC receiver, Arduino, or any source of a PWM servo-signal into the Channel A and/or Channel B ports. The beefy BEC will supply 6.2V and up to 6A to the servo controller via the + pins so that you can drive servos and other devices without the need for a separate battery.


Each channel of the motor controller can handle up to 40A of continuous current. You can plug in as many motors as you’d like to each of the two channels—just as long as you do not surpass the current limit of that channel. The bullet connectors allow you to wire-up your motor or build a harness to supply power to multiple motors.

Need bullet connectors?

This motor controller does NOT include 3.5mm bullet connectors. If your motors do not have 3.5mm bullet connectors, you can pick up an adaptor or solder 3.5mm bullet leads to your motors to make them compatible with this motor controller.

Safety Features

  • Temperature Protection
  • Soft Current Protection
  • Hard Current Protection
  • Reverse Voltage Protection
  • BEC Soft Current Protection
  • BEC Hard Circuit Protection
  • BEC Temperature Protection
  • BEC Reverse Voltage Protection
  • Signal Arm Zone

Included Components

2 3804-1717-0100 Servo Extension (3-Pos TJC8, MH-FC to MH-FC, 100mm Length)

Start Your 20V Journey!

Get this product along with other awesome 20V components when you snag our 20V Radio Control Bundle! It’s a house-curated selection of electronics that gives you everything you need to begin your journey into heavy-duty 20V action!


Compatible Motor Type Brushed DC
Motor Channels 2
PWM Range 1050– 1950µs
Voltage Range 9 – 30V
Continuous Current per Channel 40A
Burst Current per Channel 50A
BEC Voltage 6.2V
BEC Continuous Current 6A
BEC Burst Current 7.5A
Power Connector XT90 (FH-MC)
Motor Connectors 3.5mm Bullet (MH-FC)
Signal Connectors 2.54mm (0.1”) Pitch Male Header (TJC8)
Signal Voltage 5V/3.3V
Weight 98g (3.5oz)

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