ISO7321CQDQ1

Overview

The ISO7321CQDQ1 is an automotive-grade, dual-channel digital isolator from Texas Instruments. It features a 1/1 channel configuration with unidirectional data flow and supports data rates up to 25 Mb/s. The device provides galvanic isolation with a rated insulation voltage of 3000 Vrms and a common-mode transient immunity of 25 kV/µs. It operates on a single supply voltage ranging from 3 V to 5.5 V, drawing a typical operating current of 3.7 mA. Key electrical parameters include a propagation delay of 33 ns and a minimum operating temperature of -40°C. The component is housed in an 8-pin SOIC package.

Feature Summary

• Integrated noise filters designed for harsh industrial environments to suppress short noise pulses at input pins
• Automotive qualification ensuring reliability for vehicle applications under demanding conditions
• Galvanic isolation capability prevents noise currents from entering data buses or other circuits

Applications

• Automotive electronic control units requiring isolated communication interfaces
• Industrial systems operating in environments with significant electromagnetic interference
• Isolated gate driver circuits for power switching applications

Procurement Notes

Verify the complete part number including suffixes such as CQDQ1 to ensure correct packaging, temperature grade, and automotive qualification status. Confirm that the specific variant matches the required insulation voltage and data rate specifications for the target application. Cross-reference ordering information with official Texas Instruments documentation to avoid discrepancies in package type or lead-free compliance.

Selection Notes

Select this component when automotive certification and robust noise immunity are critical requirements. The 25 Mb/s data rate suits moderate-speed communication needs, while the 3000 Vrms isolation rating provides adequate safety margins for many low-voltage automotive systems. Consider the 3.7 mA supply current for power-sensitive designs. Ensure the 8-SOIC package dimensions fit the available PCB footprint constraints.

Part Context

This device belongs to the ISO732x-Q1 family of automotive digital isolators. The family shares similar architectural features, including integrated noise filtering and galvanic isolation capabilities. Variants within the family may differ in channel count, data rate, or specific insulation ratings, but all maintain the core design philosophy of reliable operation in electrically noisy automotive and industrial environments.

Replacement Considerations

Check for direct pin-compatible alternatives within the ISO732x-Q1 series that offer higher data rates or different isolation voltages if system requirements change. Verify that any substitute maintains the same SOIC-8 package and automotive qualification standards to ensure mechanical and regulatory compatibility.