HC55261P

Telecom Overview

The HC55261P is a Subscriber Line Interface Circuit (SLIC) manufactured by Harris Corporation, designed for analog subscriber line cards in Central Office and PABX switches. It complies with ITU standards and features low power operation. The device provides normal and reversed DC feed, current-limited loop feed, and integrated drivers for ringing, test-in, and test-out relays. It includes thermal shutdown protection with alert signals, on-hook transmission capabilities, and selectable transmit/receive gain settings. The component supports parallel digital control and status monitoring, ensuring robust performance in telecom applications.

Telecom Feature Summary

• ITU CO/PABX SLIC with low power standby
• Integrated relay drivers for ringing and testing
• Thermal shutdown protection with alert signal
• Selectable transmit and receive gain settings

Telecom Applications

• Central Office line circuits
• PABX line circuits
• Analog subscriber line cards

Telecom Procurement Notes

Verify the manufacturer origin, as Harris Corporation's semiconductor assets were acquired by Intersil and subsequently Microchip Technology. Confirm RoHS compliance status, as older Harris designs may not meet current environmental regulations. Ensure the package type matches the target PCB footprint. Check for availability through authorized distributors or surplus suppliers, noting that production may be limited or discontinued depending on the specific revision.

Telecom Selection Notes

Select this component for applications requiring ITU-compliant subscriber line interfacing with low power consumption. It is suitable for systems needing integrated relay driving and thermal protection without external discrete components. Consider the selectable gain settings for impedance matching requirements. Verify compatibility with the system's digital control interface for status monitoring and configuration.

Telecom Part Context

Harris Corporation specialized in electronic components before merging with L3 Technologies to form L3Harris Technologies in 2019. The HC55261P belongs to the family of Subscriber Line Interface Circuits (SLICs), which are critical for connecting analog telephones to switching networks. These devices handle line signaling, power feeding, and protection functions essential for reliable voice communication infrastructure.

Telecom Replacement Considerations

The HC55261C is a documented pin-compatible alternative within the same product family. Other compatible SLICs from Intersil or Microchip should be evaluated for functional equivalence regarding ITU compliance and power specifications.