ISO7021D

Overview

The ISO7021D is a two-channel digital isolator from Texas Instruments utilizing capacitive coupling technology. It operates within a supply voltage range of 1.71 V to 5.5 V and provides an isolation voltage of 3000 Vrms. The device supports data rates up to 4 Mb/s with a maximum propagation delay of 165 ns. It features a common-mode transient immunity of 100 kV/µs and functions across a temperature range of -55°C to +125°C. Packaged in an 8-SOIC format, it consumes minimal power, with typical operating currents of 6.5 µA and 129 µA per channel.

Feature Summary

• Capacitive coupling architecture for high-speed signal transmission
• Functional safety capability with supporting documentation
• Ultra-low power consumption design
• ATE X and IECEx certification compliance

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment with strict safety isolation standards
• Power metering and energy monitoring circuits
• Inverter drives and motor control applications

Procurement Notes

Verify the specific suffix (D vs DR) against your bill of materials, as the suffix indicates packaging type rather than functional difference. Confirm that the 8-SOIC package dimensions match your PCB footprint requirements. Ensure the selected variant meets the required ATEX or IECEx zone classifications if used in hazardous environments. Check the latest datasheet for any updates to functional safety documentation references.

Selection Notes

Select this component when bidirectional isolation is not required, as the channels are unidirectional. Consider the 4 Mb/s data rate limit for high-speed communication needs. Evaluate the 3000 Vrms isolation rating against system creepage and clearance requirements. The wide supply voltage range allows compatibility with both 1.8 V and 5 V logic domains without level shifting.

Part Context

This part belongs to the ISO7021 family of ultra-low power digital isolators. It shares the same core functionality as the ISO7021DR but differs in packaging configuration. The series is designed for applications demanding high reliability and low power dissipation in compact surface-mount packages.

Replacement Considerations

The ISO7021DR is functionally identical regarding electrical performance and pinout. Verify that the replacement matches the required reel or cut-tape quantity specifications for your assembly process.