ISO6721BDR

Overview

The ISO6721BDR is a general-purpose, dual-channel digital isolator from Texas Instruments featuring capacitive coupling technology. It provides bidirectional signal isolation with a data rate of 50 Mb/s and supports logic voltages ranging from 1.71 V to 5.5 V. The device offers an insulation voltage of 5000 Vrms and operates within a temperature range of -40°C to +125°C. Key electrical parameters include a maximum propagation delay of 18 ns, typical rise/fall times of 4.5 ns, and a common-mode transient immunity of 100 kV/µs. It is housed in an 8-pin SOIC package.

Feature Summary

• Capacitive coupling architecture for robust signal isolation
• Bidirectional channel configuration supporting 1/1 input/output topology
• Functional safety capability with documentation available for system design

Applications

• Industrial communication interfaces including CAN, RS-232, and RS-485
• SPI bus isolation in sensor networks
• General-purpose digital isolation in noisy environments

Procurement Notes

Verify the specific suffix 'BDR' corresponds to the bidirectional variant when sourcing. Confirm the 8-SOIC package dimensions match the PCB footprint requirements. Ensure the operating voltage range aligns with the target logic levels. Check for functional safety certification documents if required for the final application. Validate the insulation voltage rating against system isolation standards.

Selection Notes

Select this component for applications requiring bidirectional data transfer across isolation barriers. It is suitable where moderate data rates up to 50 Mbps are sufficient. Consider the 5000 Vrms insulation rating for high-noise industrial settings. The wide supply voltage range allows compatibility with various logic families. Evaluate the thermal performance within the specified operating temperature range.

Part Context

This part belongs to the ISO672x family of general-purpose basic dual-channel digital isolators. The series is designed to provide robust EMC performance and reliable signal transmission. It complements other variants in the lineup that may offer unidirectional channels or different insulation ratings. The family targets cost-sensitive applications requiring standard isolation capabilities.

Replacement Considerations

Check for direct pin-compatible alternatives within the ISO672x family. Verify if unidirectional variants like ISO6721 can be adapted if bidirectional functionality is not strictly required. Ensure substitute parts maintain the same 5000 Vrms insulation rating and 50 Mbps data rate specifications.