ULN2075B

Overview

The ULN2075B is a quad NPN Darlington switch array designed to interface logic circuits with high current and high voltage loads. Each of the four switches delivers up to 1.5 A output current. The device features a minimum breakdown voltage of 80 V and a sustaining voltage of at least 50 V measured at 100 mA. Unlike other variants in the series, the ULN2075B utilizes isolated Darlington pinouts rather than common emitters, making it suitable for emitter follower configurations. It is compatible with popular 5 V logic families.

Feature Summary

• Isolated Darlington pinout configuration distinct from common emitter designs
• High current switching capability per channel
• High voltage breakdown tolerance for robust load interfacing

Applications

• Emitter follower circuit configurations
• Interface between logic families and high voltage loads
• High current switching applications requiring isolated outputs

Procurement Notes

Verify component authenticity through official STMicroelectronics channels or authorized distributors. Confirm package integrity and marking accuracy upon receipt. Check for obsolescence status as this component may be superseded by newer generations. Ensure storage conditions meet semiconductor handling standards to prevent degradation before assembly.

Selection Notes

Select the ULN2075B when an isolated Darlington topology is required for specific circuit topologies like emitter followers. Choose this part over common-emitter variants such as the ULN2067B if independent control of each switch's emitter potential is necessary. Verify that the 80 V breakdown and 1.5 A current ratings align with the specific load requirements of the design.

Part Context

The ULN2075B belongs to the ULN20xxB family of quad Darlington switches manufactured by STMicroelectronics. This family provides versatile solutions for driving inductive and resistive loads directly from logic inputs. While many members share common emitter connections, the ULN2075B and ULN2077B are distinguished by their isolated pinouts, offering design flexibility for specialized analog or switching applications within the same product line.

Replacement Considerations

Public confirmed substitute part numbers include ULN2077B, which shares the isolated Darlington pinout characteristic. Other family members like ULN2067B or ULN2069B serve similar functions but utilize common emitters and integral suppression diodes, requiring schematic adjustments if used as replacements.