A4988 Stepper Motor Driver

₹139

01 — About

What it does

The A4988 Stepper Motor Driver is a microstepping bipolar stepper motor driver capable of up to 1/16 microstepping. It provides smooth, precise motion control for 3D printers, CNC machines, and positioning systems.

Key features

Up to 1/16 microstepping for smooth motion
2A per coil max with adequate cooling
Adjustable current limiting via potentiometer
Multiple step resolutions: full, 1/2, 1/4, 1/8, 1/16
Protections: over-temperature, over-current, short-circuit
STEP/DIR interface for simple control
Auto current decay mode detection

Good to know

CRITICAL: Adjust current limit BEFORE connecting motor – measure Vref
Formula: Current Limit = Vref × 2.5 (for standard 0.05Ω sense resistors)
Heatsink + fan REQUIRED for currents above 1A
Enable pin is active LOW – leave disconnected to enable
Do not disconnect motor while powered – will destroy driver
MS1, MS2, MS3 pins set microstep resolution (see datasheet)

02 — Datasheet

Specifications

Model: A4988 (Pololu-compatible)
Motor Type: Bipolar stepper
Max Current: 1A per coil (2A with heatsink)
Microstepping: Full, 1/2, 1/4, 1/8, 1/16
Logic Voltage: 3.3V – 5V
Motor Voltage: 8V – 35V
Interface: STEP, DIR, ENABLE, MS1-MS3
Protection: Thermal shutdown, overcurrent
Dimensions: 15mm x 20mm