ISO7021FDR

Overview

The ISO7021FDR is a two-channel digital isolator from Texas Instruments, designed for ultra-low power applications. It features capacitive coupling technology with a data rate of 4 Mb/s and an insulation voltage of 3000 Vrms. The device operates within a supply voltage range of 1.71 V to 5.5 V, consuming only 6.5 uA per channel in typical operation. It offers a propagation delay of 140 ns and functions reliably across a temperature range of -55°C to +125°C. Packaged in an SOIC-8 surface-mount format, it is ATEX/IECEx certified.

Feature Summary

• Certified for use in hazardous areas (ATEX/IECEx) with ultra-low power consumption
• Capacitive coupling isolation providing robust signal transmission
• Dual-channel unidirectional configuration for isolated data transfer

Applications

• Hazardous area instrumentation and control systems
• Industrial process monitoring where intrinsic safety is required
• Low-speed isolated communication interfaces in explosive environments

Procurement Notes

Verify the specific suffix 'FDR' indicates the tape-and-reel packaging variant when ordering. Confirm that the ATEX/IECEx certification requirements align with your target installation zone classification. Ensure the SOIC-8 footprint matches your PCB layout constraints. Check for moisture sensitivity level (MSL) handling requirements during assembly. Validate that the 4 Mb/s data rate meets the system timing specifications.

Selection Notes

Select this component when intrinsic safety certification is mandatory alongside minimal power draw. The 4 Mb/s speed suits low-bandwidth sensor data or status signaling rather than high-speed buses. Consider the wide operating temperature range (-55°C to +125°C) for harsh industrial environments. The unidirectional nature requires separate channels for bidirectional communication needs. Compare against ISO7021FD if tube packaging is preferred over reel.

Part Context

The ISO7021FDR belongs to the ISO702x family of ultra-low power digital isolators. It shares the core isolation architecture with the ISO7021FD but differs in packaging. This series targets applications requiring compliance with strict hazardous area regulations while minimizing thermal load. It complements higher-speed variants like the ISO7721 by offering a specialized solution for safety-critical, low-data-rate scenarios.

Replacement Considerations

The ISO7021FD serves as a direct functional equivalent differing primarily in packaging (tube vs. reel). For non-hazardous area applications requiring similar specs, the ISO7021DR may be considered. Higher-speed alternatives include the ISO7721 series, though they lack the specific ATEX/IECEx certification profile.