ULN2003 Stepper Motor Driver Board

Overview

The ULN2003 SMD Driver Board is a compact, easy-to-use module for controlling 4-phase unipolar stepper motors. It is built around the ULN2003A chip, which consists of seven Silicon NPN Darlington transistor pairs. This board simplifies the wiring process with a dedicated XH-5P socket, allowing you to plug in your motor instantly without soldering. The onboard LEDs provide real-time visual feedback, showing you exactly which phase of the motor is currently active.

Key Features

• SMD Technology: Uses surface-mount components for a lower profile and better heat dissipation than the DIP version.

• Plug-and-Play Socket: Features a 5-pin JST-XH connector specifically designed for the 28BYJ-48 and 24BYJ-48 motors.

• Visual Diagnostics: Four onboard LEDs (A, B, C, D) light up to show the stepping sequence—perfect for debugging your code.

• High Current Support: Each channel can handle up to 500mA, enough to drive most small-to-medium unipolar motors.

• Logic Compatibility: Works seamlessly with 5V (Arduino/AVR) and 3.3V (ESP32/Raspberry Pi) systems.

Technical Specifications 

Feature	Specification
Driver Chip	ULN2003A (SMD Package)
Supply Voltage	5V to 12V DC
Max Current	500mA per Channel
Input Pins	IN1, IN2, IN3, IN4
Output Socket	XH-2.54 5-Pin (Standard Stepper)
Dimensions	35mm x 32mm
Indicators	4x Red SMD LEDs