ISO7721DW

Overview

The ISO7721DW is a dual-channel digital isolator from Texas Instruments featuring reinforced isolation technology. It provides a 5000 VRMS isolation rating and supports data rates up to 100 Mbps. The device exhibits a common-mode transient immunity (CMTI) of 85 kV/µs, ensuring robust performance in electrically noisy environments. It operates within a supply voltage range of 2.25 V to 5.5 V and functions across an extended temperature range of -55°C to 125°C. Packaged in a 16-pin SOIC with a 7.50 mm width, it offers propagation delays of 16 ns maximum.

Feature Summary

• Reinforced dual-channel isolation barrier designed for high reliability and safety compliance
• High-speed signal transmission capability supporting 100 Mbps data rates
• Robust electromagnetic compatibility through superior common-mode transient immunity
• Wide operating voltage and temperature ranges suitable for industrial applications

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reinforced isolation barriers
• Power metering and energy management circuits
• Inverters and motor control drives

Procurement Notes

Verify the specific package variant, as the ISO7721 family includes D and DW packages with different isolation ratings. Confirm that the 5000 VRMS rating aligns with your safety standards requirements. Check for end-of-life notices or alternative recommendations from the manufacturer due to potential obsolescence. Ensure the 16-SOIC footprint matches your PCB design constraints before finalizing procurement.

Selection Notes

Select this component when reinforced isolation certification is mandatory for safety regulations. Choose the ISO7721DW over lower-rated variants if higher working voltages or stricter creepage distances are required. Consider the 16-pin package size relative to available board space. Evaluate the 100 Mbps speed against system timing requirements to ensure adequate signal integrity without unnecessary power consumption.

Part Context

The ISO7721DW belongs to the ISO772x family of high-performance digital isolators. These devices utilize capacitive coupling technology to transmit signals across an isolation barrier. The family is designed to replace traditional magnetic couplers, offering smaller form factors and better consistency. The DW suffix specifically denotes the wide-body SOIC package which enables the higher 5000 VRMS isolation rating compared to standard packages.

Replacement Considerations

Public documentation indicates the ISO7721DWR is a similar variant within the same family. Verify pinout compatibility and isolation ratings when substituting. Consult official replacement guides for obsolete parts.