ISO7721FDW

Overview

The ISO7721FDW is a general-purpose digital isolator from Texas Instruments, housed in a 16-SOIC package. It features two independent channels with unidirectional signal transmission. The device operates on a supply voltage range of 2.25 V to 5.5 V and draws a typical operating current of 7.3 mA. It supports data rates up to 100 Mb/s with a maximum propagation delay of 16 ns. The isolator provides an insulation voltage of 5000 Vrms and exhibits a common-mode transient immunity of 85 kV/µs. It functions reliably within a temperature range of -55°C to +125°C.

Feature Summary

• Provides robust electromagnetic compatibility through high common-mode transient immunity.
• Utilizes capacitive coupling technology for reliable signal isolation between circuits.
• Offers dual-channel architecture for efficient bidirectional or parallel data transfer.

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reinforced safety isolation
• Power metering applications with isolated communication interfaces

Procurement Notes

Verify the specific suffix 'FDW' corresponds to the 16-SOIC tube packaging configuration. Confirm that the component status remains active, as some variants in this family may have been discontinued. Ensure the order matches the required insulation rating and channel count for your design specifications.

Selection Notes

Select this component when a general-purpose isolator with high CMTI is required. It is suitable for designs needing 5000 Vrms isolation in a standard SOIC footprint. Consider the 100 Mbps speed limit and 16 ns delay for timing-critical applications. Evaluate power consumption against system constraints given the 7.3 mA typical current draw.

Part Context

This part belongs to the ISO772x series of dual-channel digital isolators. It serves as a standalone solution for breaking ground loops and protecting low-voltage control circuits from high-voltage noise. The device integrates both transmit and receive paths within a single compact package, simplifying board layout compared to discrete solutions.

Replacement Considerations

Check for ISO7721FDWR if reel packaging is preferred over tubes. Verify ISO7821FDW only if higher insulation ratings are needed, noting it is a distinct product line.