ISO7721FSD

Overview

The ISO7721FSD is a dual-channel digital isolator from Texas Instruments featuring capacitive coupling technology. It operates within a supply voltage range of 2.25 V to 5.5 V and supports data rates up to 100 Mb/s. The device provides an isolation rating of 5000 Vrms with a typical common-mode transient immunity (CMTI) of ±100 kV/µs. Key electrical parameters include a propagation delay of 17 ns, rise/fall times of 3.9 ns, and a maximum pulse width distortion of 0.5 ns. It functions reliably across an extended temperature range from -55°C to +125°C and is housed in an SOIC-8 package.

Feature Summary

• Robust EMC performance with high common-mode transient immunity
• Long-term reliability with projected lifetime exceeding 30 years at working voltage
• High isolation barrier supporting reinforced insulation standards

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reinforced isolation barriers
• Power metering applications for signal integrity

Procurement Notes

Verify the specific suffix 'FSD' against official Texas Instruments documentation to confirm pinout, packaging, and qualification status. Ensure compatibility with system voltage levels and isolation requirements before integration. Cross-reference datasheet revisions to validate current specifications and recommended operating conditions.

Selection Notes

Select this component when high-speed bidirectional or unidirectional data transmission requires robust noise immunity in electrically noisy environments. The wide operating temperature range and high CMTI make it suitable for harsh industrial settings. Confirm that the SOIC-8 footprint aligns with PCB layout constraints and thermal management needs.

Part Context

The ISO7721 belongs to the ISO77xx family of digital isolators utilizing silicon dioxide (SiO2) insulation technology. This family offers superior performance compared to traditional optocouplers in terms of speed, power consumption, and consistency. The ISO7721 specifically addresses applications demanding dual-channel isolation with high reliability and long operational life.

FAQ

What is the typical Common-Mode Transient Immunity (CMTI) for the ISO7721?

The typical CMTI is ±100 kV/µs, ensuring reliable operation in high-noise environments.

Does the ISO7721 support reinforced insulation?

Yes, the device is rated for up to 5000 Vrms isolation, supporting reinforced insulation standards.