ISO7242ADW Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7242ADW is a general-purpose digital isolator manufactured by Texas Instruments, featuring 4000Vpk isolation voltage, 4 channels, and 1Mbps data rate in a 16-SOIC package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and applications requiring extended component availability or enhanced performance specifications.

Key Parameters

Parameter	ISO7242ADW
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Number of Channels	4
Voltage - Isolation	4000Vpk
Data Rate	1Mbps
Common Mode Transient Immunity (Min)	25kV/µs
Package / Case	16-SOIC (0.295", 7.50mm Width)
Voltage - Supply	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 for the ISO7242ADW is determined by the following critical parameters:

Primary Substitution Criteria:

Number of channels: 4 channels required
Package compatibility: 16-SOIC form factor
Isolation voltage: Minimum 4000Vpk or equivalent Vrms rating
Supply voltage range: Must overlap with 3.15V ~ 5.5V
Operating temperature: Must support -40°C ~ 125°C range
Channel configuration: Unidirectional, 2/2 input-output split

Substitution Categories:

Category 1 - Direct Parametric Equivalents (Same isolation technology, matching channel count and package):

ISO7231ADW: 3-channel variant with identical isolation voltage and CMTI, same package
IL 715-3, IL 715-3E, IL 715-3ETR7: 4-channel GMR-based isolators with higher data rate and CMTI, compact 16-SOIC package

Category 2 - Enhanced Performance Substitutes (Higher isolation voltage, data rate, or CMTI):

ISO6742DWR: 5000Vrms isolation, 50Mbps data rate, 100kV/µs CMTI, active product status
IL 715, IL 715E, IL 715T, IL 715ETR13, IL 715T-3: 2500Vrms isolation, 110Mbps data rate, 100kV/µs CMTI, GMR technology

These substitutes maintain functional compatibility while offering improved electrical performance or supply chain availability.

Parameter Comparison

Parameter	ISO7242ADW	ISO6742DWR	ISO7231ADW	IL 715-3	IL 715-3E	IL 715E
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	NVE Corp	NVE Corp	NVE Corp
Technology	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling	GMR	GMR	GMR
Number of Channels	4	4	3	4	4	4
Voltage - Isolation	4000Vpk	5000Vrms	4000Vpk	2500Vrms	2500Vrms	2500Vrms
Data Rate	1Mbps	50Mbps	1Mbps	110Mbps	110Mbps	110Mbps
Common Mode Transient Immunity (Min)	25kV/µs	100kV/µs	25kV/µs	100kV/µs	100kV/µs	100kV/µs
Propagation Delay tpLH / tpHL (Max)	95ns, 95ns	18ns, 18ns	95ns, 95ns	15ns, 15ns	15ns, 15ns	15ns, 15ns
Voltage - Supply	3.15V ~ 5.5V	2.25V ~ 5.5V	3.15V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)
Product Status	Last Time Buy	Active	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not applicable	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile): ISO6742DWR is the primary recommended substitute. It maintains the same 16-SOIC package footprint (0.295", 7.50mm width), supports the full -40°C to 125°C operating range, and is ROHS3 compliant. The device offers enhanced performance with 50Mbps data rate and 100kV/µs CMTI while maintaining backward compatibility with supply voltage requirements. Product status is Active, ensuring long-term availability.

For Extended Temperature or Compact Package Requirements: IL 715-3E provides a compact 16-SOIC package (0.154", 3.90mm width) with ROHS3 compliance and unlimited moisture sensitivity. Operating temperature is limited to -40°C to 100°C. IL 715E offers the standard 16-SOIC package (0.295", 7.50mm width) with ROHS3 compliance and identical electrical performance.

For Applications Not Requiring 4000Vpk Isolation: IL 715 series devices (IL 715, IL 715-3, IL 715E, IL 715T, IL 715-3E, IL 715-3ETR7, IL 715ETR13, IL 715T-3) provide 2500Vrms isolation with significantly higher data rates (110Mbps) and CMTI (100kV/µs). These are suitable for applications where lower isolation voltage is acceptable and higher speed performance is beneficial. GMR technology offers unlimited moisture sensitivity (MSL 1).

Compliance Considerations:

ISO7242ADW and ISO6742DWR: ROHS3 compliant
IL 715-3E, IL 715E, IL 715-3ETR7, IL 715ETR13: ROHS3 compliant
IL 715, IL 715-3, IL 715T, IL 715T-3: RoHS non-compliant

Frequently Asked Questions (FAQ)

Q: Can ISO6742DWR directly replace ISO7242ADW in existing designs? A: Yes. ISO6742DWR maintains identical package dimensions (16-SOIC, 0.295" width), supply voltage compatibility (2.25V ~ 5.5V encompasses the original 3.15V ~ 5.5V range), and full operating temperature range (-40°C ~ 125°C). Pin-to-pin compatibility and functional equivalence are established through the same 4-channel, unidirectional configuration.

Q: What is the key difference between IL 715-3 and IL 715E? A: Package width differs. IL 715-3 uses 16-SOIC (0.154", 3.90mm width), while IL 715E uses 16-SOIC (0.295", 7.50mm width). Both provide identical electrical performance (2500Vrms isolation, 110Mbps data rate, 100kV/µs CMTI). Selection depends on PCB layout constraints and available board space.

Q: Why do IL 715 series devices have lower isolation voltage than ISO7242ADW? A: IL 715 series devices provide 2500Vrms isolation compared to ISO7242ADW's 4000Vpk. These are suitable for applications where lower isolation voltage meets system requirements. The trade-off includes significantly higher data rates (110Mbps vs. 1Mbps) and faster CMTI (100kV/µs vs. 25kV/µs), making them suitable for high-speed communication protocols.

Q: Are there RoHS compliance differences between substitutes? A: Yes. ISO6742DWR, IL 715-3E, IL 715E, IL 715-3ETR7, and IL 715ETR13 are ROHS3 compliant. IL 715, IL 715-3, IL 715T, and IL 715T-3 are RoHS non-compliant. For applications requiring RoHS compliance, select from the compliant variants.

Q: What is the moisture sensitivity difference between ISO7242ADW and IL 715 series? A: ISO7242ADW has MSL 2 (1 Year), requiring controlled storage conditions. IL 715 series devices have MSL 1 (Unlimited), allowing indefinite storage without moisture control. This provides supply chain flexibility for long-term inventory management.

Q: Can ISO7231ADW (3-channel) substitute for ISO7242ADW (4-channel)? A: No. ISO7231ADW provides only 3 channels with 2/1 input-output configuration, while ISO7242ADW requires 4 channels with 2/2 configuration. Channel count mismatch prevents direct substitution unless application design is modified to accommodate reduced channel availability.

Q: What is the operating temperature limitation of IL 715 series devices? A: Most IL 715 variants operate from -40°C to 100°C, compared to ISO7242ADW's -40°C to 125°C range. IL 715T and IL 715T-3 extend to -40°C to 125°C. For applications requiring full 125°C operation, select IL 715T or IL 715T-3 variants.

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