The ULN2003 SMD 4-Channel Breakout Board is a compact driver module based on the ULN2003 Darlington transistor array, designed for interfacing low-power control signals with higher-current loads. It provides four independent output channels capable of driving relays, solenoids, stepper motors, LEDs, and other inductive loads with ease.

This SMD breakout board simplifies prototyping and integration by exposing clear input and output pins, making it ideal for use with microcontrollers such as Arduino, ESP32, Raspberry Pi, and similar platforms.

Features:

1. Based on ULN2003 Darlington transistor array
2. 4 independent high-current output channels
3. Logic-level compatible inputs (TTL / CMOS)
4. Integrated flyback diodes for inductive load protection
5. Compact SMD breakout design for space-constrained projects
6. Easy interfacing with microcontrollers and control boards
7. Suitable for driving relays, motors, solenoids, lamps, and LEDs
8. Reliable switching performance and low saturation voltage

Specifications:

• IC Used: ULN2003
• Number of Channels: 4
• Input Voltage (Logic): 3.3V – 5V compatible
• Output Voltage: Up to 50V
• Output Current: Up to 500mA per channel (peak)
• Total Output Current: Limited by thermal dissipation
• Driver Type: Darlington NPN transistor array
• Protection: Built-in clamp (flyback) diodes
• Package Type: SMD on breakout PCB
• Mounting: Through-hole pin headers / solder pads
• Operating Temperature: –20°C to +85°C

Package Includes:

1 × ULN2003 SMD 4-Channel Breakout Board