ULN2069B

Overview

The Allegro Microsystems ULN2069B is a quad Darlington switch array designed to interface logic circuits with high current and high voltage loads. Each of the four NPN Darlington switches delivers an output current up to 1.5 A. The device features a minimum breakdown voltage of 80 V and a sustaining voltage of at least 50 V measured at 100 mA. It includes integral suppression diodes for inductive load protection and has common emitters. The inputs are compatible with popular 5 V logic families, ensuring direct interfacing capabilities.

Feature Summary

• Contains four independent NPN Darlington switches for driving high current loads
• Includes integral suppression diodes to protect against inductive load back-EMF
• Compatible with standard 5 V logic families for direct control interface

Applications

• Relay driver circuits
• Solenoid actuation systems
• Lamp and lighting control interfaces

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package type and marking codes match official specifications. Check for obsolescence status as this series may have limited availability from original manufacturers.

Selection Notes

Select the ULN2069B when interfacing 5 V logic with loads requiring up to 1.5 A per channel. Ensure the application voltage does not exceed the 80 V breakdown rating. Consider thermal management requirements due to power dissipation in Darlington configurations under heavy load conditions.

Part Context

The ULN2069B belongs to the ULN20xxB family of quad Darlington arrays manufactured by Allegro Microsystems and STMicroelectronics. This family provides a standardized solution for switching applications where logic-level signals must control higher power devices without external transistor stages.