ISO7231ADW Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7231ADW is a general purpose digital isolator manufactured by Texas Instruments, featuring 4000Vpk isolation voltage, 3 channels, and 1Mbps data rate in a 16-SOIC surface mount package. This device is currently in Last Time Buy status, indicating end-of-life production. Identifying qualified substitute parts ensures design continuity and supply chain reliability for applications requiring digital isolation functionality.

Substiute Parts

ISO7231ADW

Texas InstrumentsIn Stock: 2655ISO7231ADW Datasheet

Current PartRFQ

ISO7731DWR

Texas InstrumentsIn Stock: 17321ISO7731DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISO7231ADW is determined by the following critical parameters:

• Package Compatibility: 16-SOIC (0.295", 7.50mm Width) form factor for direct PCB layout compatibility
• Channel Configuration: 3 channels with 2/1 input/output distribution matching the original pinout
• Channel Type: Unidirectional topology for signal direction consistency
• Technology: Capacitive coupling isolation method
• Isolation Voltage: Minimum 4000Vpk to meet or exceed the original specification
• Supply Voltage Range: Compatibility with 3.15V ~ 5.5V operating envelope
• Operating Temperature: Support for -40°C ~ 125°C range

The ISO7731DWR qualifies as a direct substitute based on these parameters while offering enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ISO7731DWR is the qualified substitute for the ISO7231ADW based on the following engineering criteria:

• Package Equivalence: Identical 16-SOIC form factor ensures direct PCB compatibility without layout modifications
• Functional Compatibility: Matching 3-channel configuration with 2/1 input/output topology and unidirectional operation preserves circuit functionality
• Regulatory Compliance: Both devices maintain ROHS3 compliance and identical REACH/ECCN classifications
• Supply Chain Continuity: ISO7731DWR holds Active product status with 17,300 units in stock, providing long-term availability compared to the Last Time Buy status of ISO7231ADW
• Performance Enhancement: The substitute offers superior isolation voltage (5000Vrms), common mode transient immunity (85kV/µs), data rate (100Mbps), and extended temperature range (-55°C), providing design margin for demanding applications

Frequently Asked Questions (FAQ)

Q: Can ISO7731DWR be used as a direct replacement for ISO7231ADW in existing designs?

A: Yes. Both devices share identical package geometry (16-SOIC), channel configuration (3 channels, 2/1 topology), and unidirectional operation. The ISO7731DWR meets or exceeds all electrical specifications of the ISO7231ADW, ensuring functional compatibility without PCB redesign.

Q: What are the key differences between these isolators?

A: The ISO7731DWR provides enhanced performance: higher isolation voltage (5000Vrms vs. 4000Vpk), superior common mode transient immunity (85kV/µs vs. 25kV/µs), faster data rate (100Mbps vs. 1Mbps), lower propagation delay (16ns vs. 95ns), and extended temperature range (-55°C to 125°C vs. -40°C to 125°C). Supply voltage compatibility is also improved (2.25V minimum vs. 3.15V minimum).

Q: Are there any supply voltage considerations when substituting?

A: The ISO7731DWR operates across 2.25V to 5.5V, which encompasses the ISO7231ADW range of 3.15V to 5.5V. Applications using supply voltages between 2.25V and 3.15V can benefit from the wider operating range of the substitute.

Q: What is the moisture sensitivity level for both devices?

A: Both the ISO7231ADW and ISO7731DWR have MSL 2 (1 Year) rating, indicating identical moisture handling and storage requirements.

Q: Why is ISO7231ADW in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production. The ISO7731DWR, with Active status and higher performance specifications, represents the current generation replacement in the Texas Instruments digital isolator portfolio.