ISO721DUBR

Overview

The ISO721DUBR is a single-channel high-speed digital isolator from Texas Instruments, designed for robust signal transmission across isolation barriers. It operates on a 3.3-V or 5-V supply and utilizes capacitive coupling technology to achieve electrical isolation. The device supports data rates up to 100 Mb/s with a typical propagation delay of 17 ns. It provides an insulation voltage rating of 2500 Vrms and offers common-mode transient immunity of 25 kV/µs. Packaged in an 8-SMD (SOIC-8) surface-mount format, it functions within a temperature range of -40°C to +125°C.

Feature Summary

• Capacitive coupling technology enables high-speed digital signal isolation without magnetic components.
• Unidirectional signal path ensures reliable data transmission from input to output.
• High common-mode transient immunity protects against noise in electrically noisy environments.
• Wide operating temperature range supports deployment in harsh industrial conditions.

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reinforced safety isolation
• Power metering applications for accurate signal measurement
• Inverter drives and motor control circuits

Procurement Notes

Verify the specific suffix 'DUBR' corresponds to the tape-and-reel packaging variant rather than tube packaging when sourcing. Confirm that the component meets RoHS compliance requirements for your region. Check for end-of-life status or obsolescence notices from Texas Instruments prior to finalizing procurement plans. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when a single unidirectional channel is sufficient for the application design. Consider the 100 Mb/s data rate limit against system timing requirements. Evaluate the 2500 Vrms isolation barrier strength against regulatory safety standards. Compare power consumption characteristics if low-energy operation is a critical design constraint.

Part Context

This part belongs to the ISO721M family of high-speed digital isolators. It serves as a general-purpose solution for replacing optocouplers in modern designs. The series emphasizes reliability and speed over traditional isolation technologies. It is categorized under interface ICs within the broader semiconductor portfolio.

Replacement Considerations

Direct pin-to-pin replacements may include other TI ISO721 variants with different packaging options. Cross-brand alternatives require verification of isolation voltage ratings and propagation delay specifications. Ensure any substitute maintains the same SOIC-8 footprint and unidirectional functionality.