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