ISO7721FSDR

Overview

The ISO7721FSDR is a robust EMC reinforced dual-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology. It features a 1/1 channel configuration with unidirectional signal transmission and supports data rates up to 100 Mb/s. The device operates within a supply voltage range of 2.25 V to 5.5 V, drawing a typical operating current of 7.3 mA. Key electrical parameters include a maximum propagation delay of 17 ns, common mode transient immunity of 85 kV/µs, and an insulation voltage rating of 5000 Vrms. It functions reliably across an extended temperature range from -55°C to +125°C and is housed in an SOIC-8 surface-mount package.

Feature Summary

• Provides reinforced insulation capabilities for high-voltage isolation applications
• Delivers robust electromagnetic compatibility performance with high common-mode transient immunity
• Supports high-speed digital communication protocols such as CAN, RS232, and RS485

Applications

• High-speed Controller Area Network (CAN) interfaces
• RS232 serial communication systems
• RS485 multi-point communication networks

Procurement Notes

Verify the specific suffix 'F' indicates reinforced insulation ratings compared to standard variants. Confirm the 'SDR' suffix corresponds to the SOIC-8 tape-and-reel packaging format. Ensure the component meets required automotive or industrial qualification standards if applicable to the target system design.

Selection Notes

Select this component when enhanced electromagnetic interference resilience is critical for signal integrity. The 100 Mb/s speed suits applications requiring faster data throughput than legacy isolators. Verify that the 5000 Vrms insulation level aligns with safety regulations for the specific isolation barrier requirements.

Part Context

This part belongs to the ISO7721 series of high-speed digital isolators. It serves as a specialized variant offering reinforced insulation, distinguishing it from basic isolation counterparts like the ISO7221. The series is designed to replace optocouplers in modern electronic designs, providing superior performance and reliability.

Replacement Considerations

Direct functional replacements may include other ISO7721 variants with different insulation ratings or packaging options. Cross-reference pinouts and electrical specifications carefully before substituting with similar capacitive isolators from the same manufacturer.