HCPL-7721-520

Logic Output Optoisolators Overview

The HCPL-7721-520 is a discontinued high-speed optocoupler manufactured by Broadcom Limited. It features a single channel with a data rate of 25 Mb/s and an isolation voltage of 3750 Vrms, though some sources indicate a 5kV rating for this specific suffix. The device utilizes CMOS technology with a push-pull output type, supporting a forward current of 10 mA and forward voltage of 5 V. Key timing parameters include a rise time of 9 ns and a fall time of 8 ns. It operates within a temperature range of -40°C to +85°C and is housed in an 8-pin PDIP or SO-8 package.

Logic Output Optoisolators Feature Summary

• CMOS-based construction integrating LED driver and detector chips for low power consumption
• Push-pull output configuration providing strong drive capability
• High common-mode rejection ratio ensuring signal integrity in noisy environments
• Compatibility with standard CMOS logic levels

Logic Output Optoisolators Applications

• Isolation for industrial digital field buses such as CC-Link, DeviceNet, and PROFIBUS
• Microprocessor interface and data transmission systems
• Level shifting for AC plasma display panels
• Computer peripheral interfaces requiring high-speed isolation

Logic Output Optoisolators Procurement Notes

Verify component authenticity carefully as the HCPL-7721-520 is officially discontinued by Broadcom. Check RoHS compliance status, as some listings indicate non-compliance while others suggest variations exist. Confirm package type (PDIP vs SO-8) and insulation voltage rating (3750 Vrms vs 5000 Vrms) against original datasheets before integration into new designs.

Logic Output Optoisolators Selection Notes

Select this component only for legacy system maintenance or replacement scenarios due to its discontinued status. Ensure the design supports the specific 8-pin footprint and electrical characteristics. Consider alternative modern high-speed optocouplers if new production is required, as supply chain stability for this part is no longer guaranteed by the manufacturer.

Logic Output Optoisolators Part Context

This device belongs to the HCPL-7721 series of high-speed optocouplers designed for robust industrial communication applications. The series leverages advanced CMOS chip technology to achieve high performance with minimal power dissipation. The HCPL-7721-520 variant specifically denotes packaging and insulation specifications within this family, targeting applications demanding reliable galvanic isolation at high data rates.

Logic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided documentation. Engineers should consult Broadcom's official obsolescence notices or cross-reference guides for direct replacements. Generic high-speed optocouplers with similar pinouts and electrical ratings may serve as functional alternatives if verified compatible.