ISO7021DR

Overview

The ISO7021DR is an ultra-low power, two-channel digital isolator manufactured by Texas Instruments. It utilizes capacitive coupling technology to isolate CMOS or LVCMOS digital I/Os. The device features a data rate of 4 Mb/s and supports unidirectional signal transmission with one forward and one reverse channel. It operates within a supply voltage range of 1.71 V to 5.5 V. Key electrical parameters include a propagation delay of up to 165 ns, a common-mode transient immunity (CMTI) of 100 kV/µs, and an isolation voltage of 3000 Vrms. The component is housed in an 8-SOIC package and functions across a temperature range of -55°C to +125°C.

Feature Summary

• Ultra-low power consumption suitable for energy-constrained applications
• High common-mode transient immunity for noise-sensitive environments
• Certified for ATEX and IECEx hazardous area installations

Applications

• ATEX and IECEx certified industrial equipment
• Isolation of CMOS or LVCMOS digital I/Os
• General-purpose digital isolation in harsh environments

Procurement Notes

Verify the specific suffix 'DR' indicates the reel packaging format when ordering. Confirm that the ATEX/IECEx certification requirements align with your target deployment zone. Ensure the SOIC-8 package dimensions fit the PCB layout constraints. Check for updated RoHS compliance status as regulatory standards evolve. Validate that the 4 Mb/s data rate meets the system timing requirements.

Selection Notes

Select this component when ultra-low power is critical alongside intrinsic safety certifications. The 4 Mb/s speed is sufficient for low-frequency control signals but not high-speed data buses. Consider the 100 kV/µs CMTI limit against expected noise levels. The wide operating temperature range supports extreme industrial conditions. Compare against higher-speed alternatives if data throughput requirements exceed current specifications.

Part Context

The ISO7021DR belongs to the ISO7021 family of digital isolators from Texas Instruments. This series focuses on providing robust isolation with minimal power draw. The DR suffix specifically denotes the tape-and-reel packaging variant. It shares the core isolation architecture with other members of the ISO702x family but differs in channel count and speed capabilities.

Replacement Considerations

ISO7021D is listed as a parameter-equivalent alternative within the same product line.