ULN2003AIDR – TEXAS INSTRUMENTS

The ULN2003AIDR is a classic Darlington transistor array designed to drive high-current loads such as relays, solenoids, and stepper motors. Operating with input logic levels typically around 5 V, each channel provides high-current switching capabilities (up to 500 mA per channel) in a robust and thermally stable package. Packaged in a DIP or surface-mount configuration, the ULN2003AIDR includes integrated flyback diodes for inductive load suppression, ensuring reliable operation and protecting the driving circuitry from voltage spikes. Its simplicity and versatility make it ideal for interfacing microcontrollers with high-power devices in industrial control systems, automotive applications, and consumer electronics. Engineers appreciate its low input current, straightforward implementation, and ability to consolidate multiple drivers into a single chip, thus reducing PCB complexity, cost, and board space while ensuring robust load management.