ISO7231ADWR

Overview

The ISO7231ADWR is a general-purpose digital isolator manufactured by Texas Instruments, housed in a 16-SOIC package. It features three unidirectional channels with a 2/1 input configuration. The device provides 4000Vpk isolation voltage and supports data rates up to 1Mbps. Key electrical parameters include a minimum common-mode transient immunity (CMTI) of 25kV/µs, maximum propagation delays of 95ns for both low-to-high and high-to-low transitions, and a maximum pulse width distortion of 10ns. Typical rise and fall times are 2ns. It operates on a supply voltage range of 3.15V to 5.5V and functions within a temperature range of -40°C to 125°C.

Feature Summary

• Provides robust galvanic isolation between circuits using capacitive coupling technology.
• Features high common-mode transient immunity to maintain signal integrity in noisy environments.
• Offers unidirectional signal transmission across three independent channels.

Applications

• Industrial automation systems requiring isolated communication interfaces
• Medical equipment needing enhanced safety isolation barriers
• Power electronics monitoring and control circuits

Procurement Notes

Verify the specific suffix 'A' indicates the 4000Vpk isolation rating, distinct from other variants like 'C' or 'M'. Confirm the 'DWR' suffix corresponds to the 16-SOIC tape-and-reel packaging format. Ensure compatibility with existing board layouts designed for SOIC-16 footprints. Check current manufacturing status as this part may be subject to end-of-life notices or replacement recommendations.

Selection Notes

Select this component when high isolation voltage (4000Vpk) is required alongside moderate data speeds (1Mbps). It is suitable for applications prioritizing reliability over high-speed throughput. Compare against ISO7231CDWR if higher speed (25Mbps) is needed but lower isolation suffices. Consider ISO7731DWR as a potential modern replacement if available and pin-compatible.

Part Context

The ISO7231 series belongs to Texas Instruments' family of general-purpose digital isolators. These devices replace traditional magnetic couplers, offering smaller size and lower power consumption. The ISO7231ADWR specifically targets applications demanding high isolation strength with simple unidirectional logic interface requirements.

Replacement Considerations

Texas Instruments recommends ISO7731DWR as a recommended replacement for this obsolete part. Verify pinout compatibility and parameter equivalence before substitution.