ISO6521REUR

Overview

The ISO6521REUR is a dual-channel digital isolator from Texas Instruments featuring unidirectional data flow. It operates with a supply voltage range of 1.71 V to 5.5 V and supports data rates up to 50 Mb/s. The device utilizes capacitive coupling for isolation, providing an insulation voltage of 570 Vrms and working voltage of 200 Vrms. Typical propagation delay is 11 ns at 3.3 V, with rise and fall times of approximately 5.3 ns. It functions within a temperature range of -40°C to +125°C and is housed in an 8-pin VSON package.

Feature Summary

• Dual-channel functional isolation with unidirectional signal transmission
• Robust SiO2 isolation barrier offering high common-mode transient immunity
• Low power consumption with support for 1.71 V to 5.5 V logic levels
• Compact VSON-8 package designed for space-constrained applications

Applications

• Power supply systems
• Motor drive circuits
• Factory automation equipment
• Building automation controls
• Smart metering infrastructure

Procurement Notes

Verify the specific suffix REU confirms the VSON-8 package and tape-and-reel orientation. Confirm RoHS compliance status through official manufacturer documentation. Ensure the component matches the 6521 marking code on the top surface. Validate that the datasheet revision aligns with current design requirements before finalizing procurement orders.

Selection Notes

Select this component when unidirectional isolation is required for SPI, UART, RS-232, RS-485, or CAN buses. It is suitable for applications needing 200 Vrms working voltage and low propagation delay. Consider the 1.71 V minimum supply voltage for compatibility with low-voltage logic interfaces. The dual-channel configuration allows simultaneous isolation of two independent signals within a small footprint.

Part Context

This part belongs to the ISO652x family of general-purpose dual-channel functional isolators. It shares architectural similarities with the ISO6520 but differs in channel directionality and specific electrical characteristics. The series is designed to replace optocouplers in modern industrial designs, offering higher reliability and lower power consumption while maintaining galvanic isolation standards.

Replacement Considerations

Check for pin-compatible alternatives within the ISO652x family if bidirectional channels are needed. Verify that substitute parts maintain the same VSON-8 package dimensions and thermal performance. Ensure replacement components meet the same 570 Vrms insulation voltage rating for safety compliance.