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Green rectangular circuit board with blue terminal blocks and pin headers, DRV8871 label visible

Adafruit

Adafruit DRV8871 3.6A DC Motor Driver Breakout Board

SKU CH-XRHB-M9MAS

A 3.6 A H-bridge breakout drives brushed DC motors from 6.5 V to 45 V with resistor-set current limiting and logic inputs up to 5.5 V

  • Product typeEngineering Development Tools
  • Simple motor control with auto-magic PWM support
  • Drives most brushed DC motors up to 3.6A peak
  • Adjustable current limit via removable Rlim resistor
  • Wide 6.5V to 45V motor supply range
  • Low 565mΩ typical RDS(on) for efficient operation

Adafruit DRV8871 3.6A Motor Driver

The Adafruit DRV8871 breakout board drives brushed DC motors up to 3.6A using a simple H-bridge design. It suits hobbyists, students and engineers building robotics or mechatronics projects that need straightforward speed and direction control. The board arrives fully assembled and tested with terminal blocks and a header strip included. Its resistor-set current limiting makes it adaptable to many motor sizes without complex configuration.

Check Power Supply and Logic Levels

Verify that your motor supply sits between 6.5V and 45V DC before connecting to the VMotor terminals. Ensure your microcontroller or controller outputs do not exceed 5.5V on the IN1 and IN2 logic inputs. The default 30K resistor sets a roughly 2A current limit; calculate and fit a different Rlim resistor if your motor requires a different threshold. Confirm your wiring can handle the peak current you intend to draw.

Assembled Board with Terminal Blocks

The board ships fully assembled so you can solder the supplied header strip or wires directly to the pads. Two-pin terminal blocks accept motor leads securely without soldering to the driver itself. A typical on-resistance of 565mΩ keeps heat manageable at moderate loads. The removable Rlim resistor lets you adjust current limiting by soldering a new value over the existing one. Compact layout suits breadboard or perfboard integration.

How it compares

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Price $8.99
Cheaper than about 60% of the 170 comparable items (median $11.49).

Specifications

Product
Product typeEngineering Development Tools

Questions about this item

What comes in the box and what do I need to buy separately?

The package includes one fully assembled and tested breakout board, two terminal blocks and a small header strip. You must supply a brushed DC motor, a 6.5 V to 45 V motor power source and a logic-level controller for the IN1 and IN2 pins.

How do I choose the current-limit version for my motor?

A 30 kΩ resistor is fitted by default giving roughly 2 A limit. Remove it or add another resistor on top to change the resistance and set a different limit up to the 3.6 A maximum.

What does the 565 mΩ on-resistance mean when the board is driving a motor?

At 565 mΩ typical on-resistance, each conducting MOSFET drops voltage proportional to the load current, so higher currents produce more heat and reduce the voltage reaching the motor.

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