ULN2067B

Overview

The ULN2067B is an obsolete quad NPN Darlington switch array designed to interface logic circuits with high current and high voltage loads. Each device contains four independent switches delivering up to 1.5 A output current. The component features a specified minimum breakdown voltage of 80 V and a sustaining voltage of at least 35 V measured at 100 mA. It includes integral suppression diodes for inductive load protection and utilizes common emitters. The input stage is compatible with 6-15 V CMOS and PMOS logic families, distinguishing it from other variants in the series that support 5 V logic.

Feature Summary

• Integral suppression diodes included for inductive load protection
• Common emitter configuration for standard switching applications
• Input compatibility with 6-15 V CMOS and PMOS logic families

Applications

• Interface between logic circuits and high current loads
• Driving inductive loads such as relays or solenoids
• High voltage switching applications requiring Darlington gain

Procurement Notes

The ULN2067B is classified as obsolete by STMicroelectronics. Verification of availability requires checking authorized distributors for remaining stock or end-of-life inventory. Designers should confirm lead times and authenticity carefully, as this component is no longer in active mass production. Alternative sourcing may involve surplus markets or approved replacement components.

Selection Notes

Select the ULN2067B when interfacing with 6-15 V CMOS or PMOS logic rather than standard 5 V TTL/CMOS. This variant differs from the ULN2064B and ULN2069B which support 5 V inputs. Ensure the application requires the specific 80 V breakdown voltage and 1.5 A current rating. Verify if the common emitter topology suits the circuit design compared to isolated pinout options like the ULN2075B.

Part Context

The ULN2067B belongs to the ULN20xxB series of Darlington transistor arrays manufactured by STMicroelectronics. This family provides multiple NPN switches in a single package to simplify driving high-power loads from low-power logic controllers. The 'B' suffix typically denotes specific electrical characteristics and input compatibility levels within the broader product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, designers must evaluate functional equivalents based on voltage, current, and logic compatibility requirements.