ISO7221BDR

Overview

The ISO7221BDR is a dual-channel 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 5 Mb/s. The device provides an isolation voltage of 2500 Vrms with a common-mode transient immunity of 25 kV/µs. It features unidirectional signal transmission, low propagation delay of 405 ns, and typical rise/fall times of 2 ns. Operating temperatures span from -40°C to +125°C, housed in an SOIC-8 package.

Feature Summary

• Capacitive coupling architecture for high-speed digital signal isolation
• Unidirectional channel configuration for dedicated input-output paths
• High common-mode transient immunity ensuring reliable operation in noisy environments

Applications

• Industrial automation systems requiring galvanic isolation
• Automotive electronics interfaces
• Consumer device communication links
• General-purpose digital isolation in mixed-signal circuits

Procurement Notes

Verify the specific suffix 'BDR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the unidirectional channel configuration aligns with the system's signal flow requirements. Ensure the SOIC-8 footprint matches the design layout. Check RoHS compliance status against current regulatory standards before finalizing procurement orders.

Selection Notes

Select this component when unidirectional isolation is sufficient for the application. The 5 Mb/s data rate suits moderate-speed communication protocols. Consider the 2500 Vrms isolation rating for basic safety barrier requirements. Evaluate the 3 V to 5.5 V supply range compatibility with existing logic levels. The wide temperature range supports harsh industrial or automotive environments.

Part Context

This part belongs to the ISO722x family of dual-channel digital isolators. It shares the same core isolation technology as other variants but differs in channel directionality and specific electrical characteristics. The family offers options for bidirectional and unidirectional configurations to suit diverse interface needs.

Replacement Considerations

ISO7221BDRG4 is a lead-free variant of the same functional device. Verify pinout and electrical specifications match exactly before substitution. Other ISO722x series members may require re-evaluation of channel directionality.