ISO7831FDW

Overview

The ISO7831FDW is a triple-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology. It operates within a supply voltage range of 2.25V to 5.5V and supports data rates up to 100Mb/s. The device provides an isolation voltage of 5700Vrms and features a common-mode transient immunity of 70kV/µs. It is housed in a 16-SOIC package with a width of 7.50mm. The component functions across an extended temperature range from -55°C to +125°C, with a typical propagation delay of 11ns and power dissipation of 150mW.

Feature Summary

• Triple-channel configuration for efficient signal isolation
• High common-mode transient immunity of 70kV/µs
• Wide operating temperature range suitable for harsh environments

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing high safety isolation ratings
• Power metering circuits for accurate signal transmission

Procurement Notes

Verify the specific suffix (e.g., FDW vs FDWR) to confirm packaging type, as tube and reel variants exist. Ensure the design accommodates the 16-SOIC footprint dimensions. Confirm that the 5700Vrms isolation rating meets the safety requirements of the target application. Check humidity sensitivity levels for proper storage and handling procedures during assembly.

Selection Notes

Select this component when a triple-channel solution is required with high isolation voltage. Compare against the quad-channel ISO7841 if four channels are needed. Consider the 100Mb/s speed limit for high-speed data applications. Evaluate the 2.25V-5.5V supply range compatibility with system logic levels.

Part Context

Part of the ISO7831 family of digital isolators designed for robust noise immunity. The FDW suffix indicates a tube-packaged SOIC-16 variant. It serves as a general-purpose isolator for breaking ground loops and protecting low-voltage circuits from high-voltage transients in industrial settings.

Replacement Considerations

ISO7831FDWR is the reel-packaged equivalent of the same electrical specification.