ISO721D

Overview

The ISO721D is a single-channel, unidirectional digital isolator from Texas Instruments utilizing capacitive coupling technology. It operates within a supply voltage range of 3 V to 5.5 V and supports data rates up to 100 Mb/s. The device provides an isolation voltage of 2500 Vrms with a common-mode transient immunity of 25 kV/µs. Key timing parameters include a maximum propagation delay of 24 ns and a pulse width distortion of 1 ns. It functions reliably across an extended temperature range of -40°C to +125°C and is housed in an 8-pin SOIC package.

Feature Summary

• Unidirectional signal transmission for single-channel isolation applications
• High-speed data transfer capability supporting up to 100 Mbps
• Robust noise immunity characterized by 25 kV/µs common-mode transient rejection
• Wide operating temperature range suitable for industrial environments

Applications

• Industrial process control systems requiring galvanic isolation
• Medical equipment signal interfacing
• Power metering and energy monitoring circuits
• General-purpose digital communication isolation

Procurement Notes

Verify the specific suffix 'D' indicates the tube packaging variant distinct from tape-and-reel options like 'DR'. Confirm RoHS compliance status through official documentation as specifications may vary by revision. Ensure the component meets the required thermal management standards for the intended operating environment given the SOIC-8 package constraints.

Selection Notes

Select this component when a single-channel, high-speed isolator is required for unidirectional data paths. It is appropriate for designs needing 2500 Vrms isolation with moderate power consumption. Consider alternative channel counts or speed ratings if the application demands bidirectional communication or higher throughput than 100 Mbps.

Part Context

This part belongs to the ISO721 series of general-purpose digital isolators. It serves as a legacy or standard option within Texas Instruments' portfolio, offering a balance between performance and cost for basic isolation needs. The device complements other variants in the family that may offer different channel configurations or packaging styles.

Replacement Considerations

ISO721MDG4 is a verified substitute within the same product family, offering similar functional characteristics with potential differences in manufacturing revisions or packaging details.