ISO7241MDW Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7241MDW is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 4 channels, and 150Mbps data rate in a 16-SOIC package. The device utilizes capacitive coupling technology and operates across -40°C to 125°C. Currently classified as Last Time Buy, alternative components are necessary for new designs and long-term availability assurance.

Key Parameters

Parameter	ISO7241MDW
Manufacturer	Texas Instruments
Isolation Voltage	2500Vrms
Number of Channels	4
Channel Configuration	3/1 (Unidirectional)
Data Rate	150Mbps
Common Mode Transient Immunity	25kV/µs
Package	16-SOIC (0.295", 7.50mm Width)
Supply Voltage Range	3.15V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: isolation voltage, number of channels, channel configuration (3/1 unidirectional), data rate, common mode transient immunity, package type, and supply voltage compatibility.

Substitutes are categorized into two groups:

Group 1: Direct Functional Equivalents (Same Package, Identical Electrical Specifications)

ISO7241MDWR: Identical electrical specifications with alternative packaging (Cut Tape & Digi-Reel). Active product status ensures long-term availability.

Group 2: Parametric Equivalents (Different Isolation Voltage or Data Rate)

ISO7231MDW: 3-channel variant (2/1 configuration) with identical isolation voltage and data rate. Obsolete status limits suitability for new designs.
MAX14131FAEE+ and MAX14131FAEE+T: 4-channel, 150Mbps, 25kV/µs CMTI with reduced isolation voltage (1000Vrms) and different package (16-SSOP). Lower supply voltage floor (1.71V) and improved propagation delay characteristics.
MAX14931 series (AAWE+, AAWE+T, BAWE+, BAWE+T, CAWE+, CAWE+T): 4-channel, 2750Vrms isolation with variable data rates (1Mbps, 25Mbps, 150Mbps). Enhanced isolation voltage with wider supply range (1.71V ~ 5.5V) and improved MSL rating.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	Config	Data Rate	CMTI	Package	Supply Voltage	Status
ISO7241MDW	Texas Instruments	2500Vrms	4	3/1	150Mbps	25kV/µs	16-SOIC	3.15V ~ 5.5V	Last Time Buy
ISO7241MDWR	Texas Instruments	2500Vrms	4	3/1	150Mbps	25kV/µs	16-SOIC	3.15V ~ 5.5V	Active
ISO7231MDW	Texas Instruments	2500Vrms	3	2/1	150Mbps	25kV/µs	16-SOIC	3.15V ~ 5.5V	Obsolete
MAX14131FAEE+	Analog Devices/Maxim	1000Vrms	4	3/1	150Mbps	25kV/µs (Typ)	16-SSOP	1.71V ~ 5.5V	Active
MAX14131FAEE+T	Analog Devices/Maxim	1000Vrms	4	3/1	150Mbps	25kV/µs (Typ)	16-SSOP	1.71V ~ 5.5V	Active
MAX14931AAWE+	Analog Devices/Maxim	2750Vrms	4	3/1	1Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active
MAX14931AAWE+T	Analog Devices/Maxim	2750Vrms	4	3/1	1Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active
MAX14931BAWE+	Analog Devices/Maxim	2750Vrms	4	3/1	25Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active
MAX14931BAWE+T	Analog Devices/Maxim	2750Vrms	4	3/1	25Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active
MAX14931CAWE+	Analog Devices/Maxim	2750Vrms	4	3/1	150Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active
MAX14931CAWE+T	Analog Devices/Maxim	2750Vrms	4	3/1	150Mbps	25kV/µs (Typ)	16-SOIC	1.71V ~ 5.5V	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ISO7241MDWR is the primary substitute, offering identical electrical and functional characteristics with Active product status. This part maintains the same 16-SOIC package footprint and supply voltage range. The alternative packaging (Cut Tape & Digi-Reel) provides superior long-term availability compared to the Last Time Buy status of ISO7241MDW.

For Applications Tolerating Reduced Isolation Voltage: MAX14131FAEE+ and MAX14131FAEE+T support 150Mbps operation with 1000Vrms isolation in a 16-SSOP package. These parts feature improved propagation delay (7.5ns/7.4ns vs. 23ns) and lower supply voltage floor (1.71V). Selection requires PCB layout modification due to package change and confirmation that 1000Vrms isolation meets system requirements.

For Applications Requiring Enhanced Isolation Voltage: MAX14931CAWE+ and MAX14931CAWE+T deliver 2750Vrms isolation with 150Mbps data rate in 16-SOIC package, maintaining footprint compatibility. These parts support lower supply voltages (1.71V floor) and offer improved MSL rating (1 vs. 2). Selection is appropriate when higher isolation margins are required.

For Low-Speed Applications: MAX14931AAWE+ and MAX14931AAWE+T operate at 1Mbps with 2750Vrms isolation. MAX14931BAWE+ and MAX14931BAWE+T provide 25Mbps operation. Both series maintain 16-SOIC package compatibility and offer enhanced isolation voltage with wider supply range.

All substitute parts maintain ROHS3 compliance and -40°C to 125°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can ISO7241MDWR replace ISO7241MDW directly? A: Yes. ISO7241MDWR is functionally identical with matching electrical specifications, channel configuration, and package footprint. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and Active product status, making it suitable for new designs and production continuity.

Q: What are the key differences between ISO7241MDW and MAX14931CAWE+? A: Both support 4 channels, 3/1 configuration, 150Mbps data rate, and 16-SOIC package. MAX14931CAWE+ provides higher isolation voltage (2750Vrms vs. 2500Vrms) and lower supply voltage floor (1.71V vs. 3.15V). Propagation delay is significantly faster (7.5ns vs. 23ns). These differences require verification that the application can tolerate improved timing characteristics.

Q: Is ISO7231MDW a suitable substitute? A: ISO7231MDW is not recommended for new designs. While it maintains 2500Vrms isolation and 150Mbps data rate, it reduces channel count to 3 (2/1 configuration) and carries Obsolete product status, limiting long-term availability and support.

Q: Can MAX14131FAEE+ replace ISO7241MDW in high-isolation applications? A: MAX14131FAEE+ is not suitable if 2500Vrms isolation is required. It provides only 1000Vrms isolation. However, it offers superior propagation delay performance (7.5ns vs. 23ns) and lower supply voltage floor (1.71V). Selection requires confirmation that reduced isolation voltage meets system safety and regulatory requirements. Package change from 16-SOIC to 16-SSOP necessitates PCB redesign.

Q: What is the impact of packaging differences? A: ISO7241MDW is supplied in Tube packaging; ISO7241MDWR uses Cut Tape & Digi-Reel. Both formats are compatible with standard pick-and-place assembly equipment. Tube packaging is typical for lower-volume applications, while Cut Tape & Digi-Reel supports higher-volume production. MAX14131 series uses 16-SSOP package (0.154" width vs. 0.295"), requiring PCB layout modification and different footprint design.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the environmental compliance profile of ISO7241MDW.

Q: What is the significance of MSL rating differences? A: ISO7241MDW carries MSL 2 (1 Year); MAX14931 series carries MSL 1 (Unlimited). Lower MSL ratings indicate reduced moisture sensitivity and extended shelf life without baking requirements, providing manufacturing flexibility for inventory management.

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