ISO7221AD

Overview

The ISO7221AD is a dual-channel digital isolator from Texas Instruments, featuring a unidirectional 1/1 channel configuration. It supports data rates up to 1 Mbps with a maximum propagation delay of 475 ns and typical rise/fall times of 1 ns. The device offers a 4000 V isolation voltage rating and operates within a supply voltage range of 3 V to 5.5 V. It is housed in an 8-pin SOIC package with a width of 3.90 mm. The component functions across an extended temperature range from -40°C to 125°C and consumes a maximum power of 390 mW.

Feature Summary

• Provides galvanic isolation between circuits using capacitive coupling technology for signal transmission.
• Features high common-mode transient immunity to maintain signal integrity in noisy environments.
• Supports standard logic levels with TTL-compatible input and output interfaces.

Applications

• Industrial communication bus isolation
• Medical equipment signal isolation
• Power metering systems

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compliance with RoHS3 standards and check for AEC-Q100 certification if automotive qualification is required. Confirm operating temperature ranges match application requirements before procurement.

Selection Notes

Select this component when bidirectional isolation is not required, as it supports only unidirectional data flow. Consider the ISO7221ADR variant for automated surface-mount assembly needs. Evaluate the ISO7221AQDRQ1 if automotive reliability standards are mandatory for the target application environment.

Part Context

This part belongs to the ISO722x family of digital isolators designed for general-purpose applications. It utilizes Texas Instruments' silicon dioxide (SiO2) insulation technology to provide robust electrical isolation. The series is engineered to replace traditional optocouplers in modern electronic designs requiring higher speed and reliability.

Replacement Considerations

ISO7221ADR: Identical functional specifications with reel packaging instead of tube.

FAQ

Is the ISO7221AD suitable for bidirectional communication?

No, the ISO7221AD is configured as a unidirectional isolator with a 1/1 channel setup. Bidirectional applications require devices such as the ISO7220 or ISO7221B.

What is the maximum data rate supported by this isolator?

The ISO7221AD supports a maximum data rate of 1 Mbps.