ISO7231ADWR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7231ADWR 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 is necessary to ensure design continuity and maintain supply chain reliability for applications requiring equivalent isolation performance and pin compatibility.

Substiute Parts

ISO7231ADWR

Texas InstrumentsIn Stock: 9244ISO7231ADWR Datasheet

Current PartRFQ

ISO7731DWR

Texas InstrumentsIn Stock: 17321ISO7731DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7231ADWR is determined by the following critical parameters:

Pin-Compatible Requirements:

• 16-SOIC package with 0.295" (7.50mm) width
• 3-channel configuration with 2/1 input distribution
• Unidirectional channel type
• Capacitive coupling technology

Electrical Compatibility Criteria:

• Isolation voltage rating equal to or greater than 4000Vpk
• Data rate equal to or greater than 1Mbps
• Supply voltage range that encompasses 3.15V ~ 5.5V
• Operating temperature range that encompasses -40°C ~ 125°C

Compliance Requirements:

• ROHS3 compliance
• Same manufacturer (Texas Instruments) for design validation consistency

The ISO7731DWR meets all substitution criteria as a qualified replacement part.

Parameter Comparison

Engineering Selection Recommendations

The ISO7731DWR is a qualified substitute for the ISO7231ADWR based on the following factors:

Pin and Package Compatibility: Both devices use identical 16-SOIC packaging with matching pinout, channel configuration (3 channels, 2/1 input distribution), and unidirectional channel architecture. Direct PCB layout compatibility is maintained.

Electrical Performance: The ISO7731DWR exceeds the minimum electrical requirements of the ISO7231ADWR across all critical parameters. The higher isolation voltage rating (5000Vrms vs. 4000Vpk), increased common mode transient immunity (85kV/µs vs. 25kV/µs), and superior data rate capability (100Mbps vs. 1Mbps) provide enhanced performance margins without introducing incompatibility.

Supply and Temperature Range: The ISO7731DWR extends the supply voltage range to 2.25V and the operating temperature range to -55°C, providing broader application flexibility while maintaining full compatibility with the original specification range.

Compliance and Supply Status: Both devices maintain ROHS3 compliance and are manufactured by Texas Instruments. The ISO7731DWR is in Active product status with 17,300 units in stock, ensuring reliable long-term availability compared to the Last Time Buy status of the ISO7231ADWR.

Design Validation: No circuit modifications are required for substitution. The ISO7731DWR operates as a direct replacement with improved electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can the ISO7731DWR be used as a direct replacement for the ISO7231ADWR without PCB modifications?

A: Yes. Both devices share identical 16-SOIC packaging, pinout, and channel configuration (3 channels, 2/1 input distribution). No PCB layout changes are required for substitution.

Q: What are the key differences between these two isolators?

A: The ISO7731DWR provides higher isolation voltage (5000Vrms vs. 4000Vpk), faster data rate (100Mbps vs. 1Mbps), lower propagation delay (16ns vs. 95ns), improved common mode transient immunity (85kV/µs vs. 25kV/µs), and extended operating temperature range (-55°C to 125°C vs. -40°C to 125°C). All improvements are backward compatible with the original design requirements.

Q: Is the ISO7731DWR suitable for applications originally designed for the ISO7231ADWR?

A: Yes. The ISO7731DWR meets or exceeds all electrical specifications of the ISO7231ADWR. Applications designed for 1Mbps operation will function correctly at the lower data rate, and the enhanced isolation voltage and CMTI provide additional safety margins.

Q: What is the supply voltage compatibility between these devices?

A: The ISO7231ADWR operates at 3.15V ~ 5.5V, while the ISO7731DWR operates at 2.25V ~ 5.5V. The ISO7731DWR is fully compatible with the original supply range and extends capability to lower voltages.

Q: Are both devices RoHS compliant?

A: Yes. Both the ISO7231ADWR and ISO7731DWR are ROHS3 compliant and meet REACH requirements.

Q: What is the current availability status of these parts?

A: The ISO7231ADWR is in Last Time Buy status with 9,145 units in stock. The ISO7731DWR is in Active status with 17,300 units in stock, providing superior long-term supply assurance.