ISO7820FDW

Overview

The ISO7820FDW is a high-performance, reinforced dual-channel digital isolator manufactured by Texas Instruments. It operates within a supply voltage range of 2.25 V to 5.5 V and supports data rates up to 100 Mb/s. The device features a maximum propagation delay of 11.7 ns and typical rise/fall times of 3.9 ns. It provides an insulation voltage of 5700 Vrms and a working isolation voltage (VIOWM) of 2000 VRMS. The component is housed in a 16-pin SOIC package with a creepage distance of 14.5 mm. It functions unidirectionally without a shutdown mode and operates across a temperature range of -55°C to +125°C.

Feature Summary

• Provides reinforced electrical isolation between input and output circuits using capacitive coupling technology.
• Supports bidirectional signal transmission through two independent channels for simultaneous data transfer.
• Maintains signal integrity with low propagation delay and minimal pulse width distortion at high speeds.

Applications

• Industrial automation systems requiring galvanic isolation for communication buses
• Medical equipment needing reinforced isolation for patient safety compliance
• Power electronics interfaces for monitoring and control in high-voltage environments

Procurement Notes

Verify the specific suffix designation to confirm packaging type, as standard tubes differ from tape-and-reel variants. Ensure compatibility with moisture sensitivity levels during storage and reflow soldering processes. Confirm that the selected variant meets the required insulation ratings for your specific application safety standards. Cross-reference the datasheet revision to ensure all electrical parameters match your design specifications before finalizing procurement orders.

Selection Notes

Select this component when reinforced isolation is mandatory rather than basic isolation. Consider the 16-pin SOIC footprint for PCB layout constraints. Evaluate power consumption against system thermal limits, noting the quiescent current per channel. Verify that the 100 Mb/s data rate suffices for the target communication protocol. Check if the unidirectional nature aligns with the signal flow requirements of the interface circuit.

Part Context

This part belongs to the ISO78xx family of high-performance digital isolators from Texas Instruments. It shares architectural similarities with the ISO7821FDW but differs in channel configuration and specific electrical characteristics. The series is designed for applications demanding high reliability and robust noise immunity in electrically noisy environments.

Replacement Considerations

The ISO7821FDW serves as a functional substitute within the same family, offering similar isolation ratings and pinout compatibility. Verify that the alternative part's specific electrical parameters, such as propagation delay and current consumption, meet the original design requirements before substitution.