ISO15MDWR RS422/RS485 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO15MDWR is a Texas Instruments RS422/RS485 digital isolator rated for 2500Vrms isolation with 3 channels, 1Mbps data rate, and 25kV/µs common mode transient immunity. Packaged in 16-SOIC surface mount configuration, this component is classified as Last Time Buy, indicating end-of-life status. Identifying qualified substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term system support.

Substiute Parts

ISO15MDWR

Texas InstrumentsIn Stock: 1412ISO15MDWR Datasheet

Current PartRFQ

ISO1410DWR

Texas InstrumentsIn Stock: 5450ISO1410DWR Datasheet

MFR RecommendedRFQ

MAX14945EWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1183MAX14945EWE+ Datasheet

MFR RecommendedRFQ

MAX14945EWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1107MAX14945EWE+T Datasheet

MFR RecommendedRFQ

MAX14948EWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 2501MAX14948EWE+ Datasheet

MFR RecommendedRFQ

MAX14948EWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 27967MAX14948EWE+T Datasheet

MFR RecommendedRFQ

MAX14949EWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3442MAX14949EWE+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO15MDWR is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Protocol: RS422/RS485 digital isolator
• Package: 16-SOIC (0.295", 7.50mm Width) surface mount
• Channel Configuration: 3 channels with 2/1 input/output arrangement
• Technology: Capacitive coupling isolation
• Isolation Voltage: Minimum 2500Vrms (equal or higher acceptable)
• Data Rate: Minimum 1Mbps (equal or higher acceptable)
• Common Mode Transient Immunity: Minimum 25kV/µs (equal or higher acceptable)

Acceptable Parameter Variations:

• Supply voltage ranges may differ provided the part operates within the system's available voltage rails
• Operating temperature range may be narrower or wider
• Packaging format (Tube, Cut Tape, Tape & Reel) does not affect electrical compatibility
• MSL rating differences are acceptable for equivalent moisture sensitivity management

The substitute parts listed below meet or exceed all mandatory compatibility criteria and are electrically and mechanically interchangeable with the ISO15MDWR in standard RS422/RS485 isolation applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MAX14948EWE+T and MAX14948EWE+ are the preferred substitutes. Both devices provide 5000Vrms isolation (exceeding the 2500Vrms requirement), maintain the 3-channel 2/1 configuration, and are in Active product status with unlimited MSL ratings. The Tape & Reel packaging (MAX14948EWE+T) is suitable for high-volume production environments. These parts are fully qualified alternatives with superior isolation voltage margin and improved reliability characteristics.

Secondary Substitutes (Conditional Compatibility):

MAX14945EWE+T and MAX14945EWE+ offer 2750Vrms isolation with equivalent channel configuration and Active product status. These are suitable for applications where the higher isolation voltage of the MAX14948 series is not required. Both variants maintain compatibility with standard supply voltage ranges and are available in multiple packaging formats.

MAX14949EWE+T provides 5000Vrms isolation with 3-channel configuration but operates within a narrower supply voltage range (3V ~ 5.5V minimum). This part is suitable only for systems with supply voltages at or above 3V.

Not Recommended:

ISO1410DWR is a half-duplex transceiver with only 1 channel (1/1 configuration) and lacks galvanic isolation. This part does not meet the mandatory 3-channel 2/1 configuration requirement and is not electrically equivalent to the ISO15MDWR.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. The transition from MSL 2 (1 Year) to MSL 1 (Unlimited) in Maxim parts provides improved moisture handling for extended storage and supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can ISO1410DWR replace the ISO15MDWR?

A: No. ISO1410DWR is a half-duplex transceiver with 1 channel (1/1 configuration) and no galvanic isolation. The ISO15MDWR requires a 3-channel digital isolator with 2/1 configuration. ISO1410DWR does not meet the mandatory electrical and functional requirements.

Q: What is the key difference between MAX14948 and MAX14945 substitutes?

A: The primary difference is isolation voltage rating. MAX14948 series provides 5000Vrms isolation, while MAX14945 series provides 2750Vrms isolation. Both exceed the ISO15MDWR's 2500Vrms requirement. MAX14948 offers greater isolation margin for high-voltage transient environments. Both maintain identical channel configuration (3 channels, 2/1), data rate (500kbps), and CMTI (35kV/µs typical).

Q: Does the packaging format (Tube vs. Tape & Reel) affect electrical compatibility?

A: No. Packaging format affects only handling, storage, and automated assembly processes. Tube and Tape & Reel variants of the same part number (e.g., MAX14948EWE+ vs. MAX14948EWE+T) are electrically and functionally identical. Selection depends on production volume and assembly equipment requirements.

Q: Why is the ISO15MDWR marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued this product line. Existing inventory is available for final orders, but no future production is planned. Identifying and qualifying substitute parts ensures design continuity and prevents supply chain disruption.

Q: Are the MAX14948 and MAX14949 parts interchangeable?

A: MAX14948 and MAX14949 share identical isolation voltage (5000Vrms), channel configuration (3 channels, 2/1), and data rate (500kbps). The primary difference is supply voltage range. MAX14948 operates at 1.71V ~ 5.5V, while MAX14949 operates at 3V ~ 5.5V minimum. MAX14948 is preferred for systems requiring lower supply voltage operation.

Q: What is the significance of MSL rating differences?

A: MSL (Moisture Sensitivity Level) 2 (1 Year) requires component use within one year of packaging. MSL 1 (Unlimited) allows indefinite storage without moisture bake-out procedures. Maxim substitutes with MSL 1 provide greater supply chain flexibility and reduced risk of moisture-related failures during extended storage.

Q: Can I use a substitute part with lower data rate (500kbps vs. 1Mbps)?

A: Substitutes with 500kbps data rate are suitable only for applications operating at or below 500kbps. If your system requires 1Mbps operation, verify that the substitute part's 500kbps rating is sufficient for your actual data transmission requirements. The ISO15MDWR's 1Mbps capability is not matched by available substitutes; however, most RS422/RS485 industrial applications operate below 500kbps.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. All recommended substitute parts (MAX14948, MAX14945, MAX14949 series) are ROHS3 compliant and carry EAR99 export classification, matching the ISO15MDWR's regulatory status.