ISO7721FDWR

Overview

The ISO7721FDWR is a dual-channel digital isolator from Texas Instruments utilizing 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 Mbps. The device provides an isolation rating of 5000 Vrms with a common-mode transient immunity (CMTI) of 85 kV/µs. It features unidirectional signal transmission across two channels in a 16-pin wide-body SOIC package. Key electrical parameters include a maximum propagation delay of 16 ns, typical rise and fall times of 1.8 ns and 1.9 ns respectively, and a power dissipation of 100 mW. The component functions reliably across an operating temperature range of -55°C to +125°C.

Feature Summary

• Provides robust electromagnetic compatibility performance suitable for noisy industrial environments
• Offers high common-mode transient immunity to maintain signal integrity during rapid voltage changes
• Delivers long-term reliability with a projected lifetime exceeding 30 years at rated working voltage

Applications

• Industrial automation systems requiring galvanic isolation between control and power stages
• Medical equipment needing reinforced insulation for patient safety compliance
• Power metering circuits isolating high-voltage sensing from low-voltage processing

Procurement Notes

Verify the specific suffix 'FDWR' corresponds to the 16-pin wide-body SOIC package variant. Confirm that the required isolation rating matches the 5000 Vrms specification. Ensure the design accommodates the 16-SOIC footprint dimensions. Check moisture sensitivity level requirements for assembly processes. Validate that the 100 Mbps data rate meets system timing constraints.

Selection Notes

Select this component when enhanced isolation barriers are necessary compared to standard variants. The wide-body SOIC package facilitates higher creepage and clearance distances. Consider the 85 kV/µs CMTI for applications with significant switching noise. Evaluate the 16-pin configuration against space constraints in dense PCB layouts. Compare power consumption against other isolators if battery life is critical.

Part Context

This part belongs to the ISO7721 family of general-purpose digital isolators. It shares core functionality with automotive-grade versions like the ISO7721FQDWVRQ1 but lacks AEC-Q100 certification. The FDWR designation specifically indicates the tape-and-reel packaging format for the wide-body SOIC-16 package. It serves as a non-isolated power solution alternative to magnetic or optical isolators.

Replacement Considerations

The ISO7721FDWVR is a compatible alternative offering identical electrical specifications in a smaller 8-pin SOIC package. Designers must verify footprint compatibility before substitution due to the difference in pin count and physical dimensions.