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A4988 / DRV8825 Stepper Motor Driver Module with Heat Sink — StepStick for 3D Printers & Arduino
A4988 / DRV8825 Stepper Motor Driver Module with Heat Sink StepStick for 3D Printers & Arduino
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A4988 / DRV8825 Stepper Motor Driver Module with Heat Sink — StepStick Carrier
The A4988 and DRV8825 stepper motor driver modules are the industry-standard StepStick-format drivers used in RAMPS 1.4/1.6 boards, 3D printer control boards (MKS, SKR, Creality), and Arduino CNC shields. Each module includes a pre-attached aluminum heat sink for thermal management at sustained current levels. Select the A4988 for standard 3D printer applications or the DRV8825 for higher current motors and finer microstepping.
Key Specifications
| Parameter | A4988 | DRV8825 |
|---|---|---|
| Max Output Current | 1A continuous (2A peak) | 1.5A continuous (2.2A peak) |
| Motor Supply Voltage | 8V – 35V | 8.2V – 45V |
| Microstepping | Full, 1/2, 1/4, 1/8, 1/16 | Full, 1/2, 1/4, 1/8, 1/16, 1/32 |
| Logic Voltage | 3.3V / 5V | 3.3V / 5V |
| Thermal Protection | Yes | Yes |
| Current Adjust | Onboard potentiometer (Vref) | Onboard potentiometer (Vref) |
| Heat Sink | Included | Included |
| Form Factor | StepStick (Pololu-compatible) | StepStick (Pololu-compatible) |
A4988 vs DRV8825 — Which to Choose?
- A4988 — Best for standard NEMA 17 motors in 3D printers (Ender 3, CR-10, Prusa i3). Proven, widely supported, easy to tune.
- DRV8825 — Better for higher-current motors, quieter operation at 1/32 microstepping, and higher voltage systems. Requires a 100μF capacitor on VMOT to prevent voltage spikes.
Typical Applications
- 3D printer axis motors (X, Y, Z, extruder) on RAMPS 1.4/1.6, MKS Gen, SKR boards
- Arduino CNC shield for laser engravers and CNC routers
- Telescope mount and camera slider motor control
- Robotic arm and pan-tilt mechanism control
- Automated curtain, blind, and valve actuator projects
Frequently Asked Questions
Q: How do I set the current limit?
Measure the Vref voltage at the potentiometer wiper with a multimeter. For A4988: Imax = Vref / 0.8. For DRV8825: Imax = Vref / 0.5. Set Vref to achieve your desired current limit. Start low and increase gradually while monitoring motor temperature.
Q: Do I need to add a capacitor for the DRV8825?
Yes. Texas Instruments recommends a 100μF electrolytic capacitor across the VMOT and GND pins to suppress voltage spikes from motor back-EMF. Without it, the DRV8825 may be damaged by transient overvoltage.
Package Contents
- 1× A4988 or DRV8825 Stepper Motor Driver Module (select variant)
- 1× Aluminum heat sink (pre-attached)
- ★Product Description
- ★About us
- ★Custom cable
A4988 / DRV8825 Stepper Motor Driver Module with Heat Sink — StepStick Carrier
The A4988 and DRV8825 stepper motor driver modules are the industry-standard StepStick-format drivers used in RAMPS 1.4/1.6 boards, 3D printer control boards (MKS, SKR, Creality), and Arduino CNC shields. Each module includes a pre-attached aluminum heat sink for thermal management at sustained current levels. Select the A4988 for standard 3D printer applications or the DRV8825 for higher current motors and finer microstepping.
Key Specifications
| Parameter | A4988 | DRV8825 |
|---|---|---|
| Max Output Current | 1A continuous (2A peak) | 1.5A continuous (2.2A peak) |
| Motor Supply Voltage | 8V – 35V | 8.2V – 45V |
| Microstepping | Full, 1/2, 1/4, 1/8, 1/16 | Full, 1/2, 1/4, 1/8, 1/16, 1/32 |
| Logic Voltage | 3.3V / 5V | 3.3V / 5V |
| Thermal Protection | Yes | Yes |
| Current Adjust | Onboard potentiometer (Vref) | Onboard potentiometer (Vref) |
| Heat Sink | Included | Included |
| Form Factor | StepStick (Pololu-compatible) | StepStick (Pololu-compatible) |
A4988 vs DRV8825 — Which to Choose?
- A4988 — Best for standard NEMA 17 motors in 3D printers (Ender 3, CR-10, Prusa i3). Proven, widely supported, easy to tune.
- DRV8825 — Better for higher-current motors, quieter operation at 1/32 microstepping, and higher voltage systems. Requires a 100μF capacitor on VMOT to prevent voltage spikes.
Typical Applications
- 3D printer axis motors (X, Y, Z, extruder) on RAMPS 1.4/1.6, MKS Gen, SKR boards
- Arduino CNC shield for laser engravers and CNC routers
- Telescope mount and camera slider motor control
- Robotic arm and pan-tilt mechanism control
- Automated curtain, blind, and valve actuator projects
Frequently Asked Questions
Q: How do I set the current limit?
Measure the Vref voltage at the potentiometer wiper with a multimeter. For A4988: Imax = Vref / 0.8. For DRV8825: Imax = Vref / 0.5. Set Vref to achieve your desired current limit. Start low and increase gradually while monitoring motor temperature.
Q: Do I need to add a capacitor for the DRV8825?
Yes. Texas Instruments recommends a 100μF electrolytic capacitor across the VMOT and GND pins to suppress voltage spikes from motor back-EMF. Without it, the DRV8825 may be damaged by transient overvoltage.
Package Contents
- 1× A4988 or DRV8825 Stepper Motor Driver Module (select variant)
- 1× Aluminum heat sink (pre-attached)
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