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ISO7242CDWG4 Equivalent & Substitute Parts
Part Overview
The ISO7242CDWG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 4 channels, and 25Mbps data rate in a 16-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device uses capacitive coupling technology and operates across a supply voltage range of 3.15V to 5.5V with an operating temperature range of -40°C to 125°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Isolation Voltage | 2500Vrms |
| Number of Channels | 4 |
| Data Rate | 25Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Supply Voltage | 3.15V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Technology | Capacitive Coupling |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the ISO7242CDWG4 is determined by the following critical parameters: isolation voltage (2500Vrms), number of channels (4), package type (16-SOIC), and supply voltage compatibility (3.15V ~ 5.5V). Substitute parts are grouped into two categories:
Direct Manufacturer Substitutes (Texas Instruments ISO7242 Series): Parts ISO7242CDW and ISO7242CDWR maintain identical electrical specifications and package dimensions. These are the primary substitutes for direct replacement.
Parametric Equivalents (Alternative Manufacturers): Parts from NVE Corp/Isolation Products (IL 715 series) provide equivalent isolation voltage, channel count, and package footprint but utilize different isolation technology (GMR instead of capacitive coupling) and offer enhanced performance characteristics such as higher data rates (110Mbps vs. 25Mbps) and superior common mode transient immunity (100kV/µs vs. 25kV/µs).
Limited Channel Equivalent: ISO7231CDW provides 3 channels instead of 4, suitable only for applications requiring fewer isolated channels while maintaining all other electrical parameters.
Parameter Comparison
| Part Number | Manufacturer | Channels | Isolation (Vrms) | Data Rate (Mbps) | CMTI (kV/µs) | Package | Supply (V) | Temp Range (°C) | Technology | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ISO7242CDWG4 | Texas Instruments | 4 | 2500 | 25 | 25 | 16-SOIC (0.295", 7.50mm) | 3.15-5.5 | -40 to 125 | Capacitive Coupling | Obsolete | ROHS3 |
| ISO7242CDW | Texas Instruments | 4 | 2500 | 25 | 25 | 16-SOIC (0.295", 7.50mm) | 3.15-5.5 | -40 to 125 | Capacitive Coupling | Last Time Buy | ROHS3 |
| ISO7242CDWR | Texas Instruments | 4 | 2500 | 25 | 25 | 16-SOIC (0.295", 7.50mm) | 3.15-5.5 | -40 to 125 | Capacitive Coupling | Active | ROHS3 |
| ISO7231CDW | Texas Instruments | 3 | 2500 | 25 | 25 | 16-SOIC (0.295", 7.50mm) | 3.15-5.5 | -40 to 125 | Capacitive Coupling | Last Time Buy | ROHS3 |
| IL 715-3 | NVE Corp | 4 | 2500 | 110 | 100 | 16-SOIC (0.154", 3.90mm) | 3-5.5 | -40 to 100 | GMR | Active | Non-compliant |
| IL 715-3E | NVE Corp | 4 | 2500 | 110 | 100 | 16-SOIC (0.154", 3.90mm) | 3-5.5 | -40 to 100 | GMR | Active | ROHS3 |
| IL 715-3ETR7 | NVE Corp | 4 | 2500 | 110 | 100 | 16-SOIC (0.154", 3.90mm) | 3-5.5 | -40 to 100 | GMR | Active | ROHS3 |
| IL 715T | NVE Corp | 4 | 2500 | 110 | 100 | 16-SOIC (0.295", 7.50mm) | 3-5.5 | -40 to 125 | GMR | Active | Non-compliant |
| IL 715T-3 | NVE Corp | 4 | 2500 | 110 | 100 | 16-SOIC (0.154", 3.90mm) | 3-5.5 | -40 to 125 | GMR | Active | Non-compliant |
Engineering Selection Recommendations
For applications requiring direct functional replacement with identical electrical performance and package dimensions, ISO7242CDWR is the primary selection. This part maintains active product status, ROHS3 compliance, and identical specifications to the obsolete ISO7242CDWG4.
ISO7242CDW serves as an alternative Texas Instruments substitute with Last Time Buy status, suitable for designs where extended procurement windows are available.
For applications tolerant of enhanced performance characteristics, IL 715-3E and IL 715-3ETR7 provide superior data rates and common mode transient immunity while maintaining 2500Vrms isolation and 4-channel configuration. These NVE Corp parts feature ROHS3 compliance and active product status. Note that IL 715-3E and IL 715-3ETR7 use a narrower SOIC package (0.154" width vs. 0.295"), requiring PCB layout verification for mechanical compatibility.
IL 715T and IL 715T-3 extend the operating temperature range to 125°C but lack ROHS3 compliance. IL 715T matches the original package width (0.295") while IL 715T-3 uses the narrower variant (0.154").
ISO7231CDW is suitable only for applications requiring 3 isolated channels, as it reduces channel count from 4 to 2/1 input/output configuration.
Frequently Asked Questions (FAQ)
Q: Can ISO7242CDWR directly replace ISO7242CDWG4 without design changes?
A: Yes. ISO7242CDWR maintains identical electrical specifications, isolation voltage, channel configuration, data rate, and package dimensions. No circuit modifications are required.
Q: What is the primary difference between ISO7242 and IL 715 series isolators?
A: The ISO7242 uses capacitive coupling technology with 25Mbps data rate and 25kV/µs CMTI. The IL 715 series uses GMR (Giant Magnetoresistive) technology, offering 110Mbps data rate and 100kV/µs CMTI. Both maintain 2500Vrms isolation and 4-channel configuration.
Q: Are IL 715-3 and IL 715-3E mechanically compatible with the original ISO7242CDWG4 footprint?
A: Both IL 715-3 and IL 715-3E use a narrower SOIC package (0.154" width) compared to the original 0.295" width. PCB layout verification is required to confirm mechanical fit. IL 715T uses the original 0.295" width and is mechanically compatible.
Q: Which substitute part offers the best compliance profile?
A: ISO7242CDWR, ISO7231CDW, IL 715-3E, and IL 715-3ETR7 all carry ROHS3 compliance. ISO7242CDWR is recommended for compliance-critical applications requiring direct replacement.
Q: Can I use ISO7231CDW as a substitute if my application uses only 3 channels?
A: Yes, if your circuit design requires only 3 isolated channels. ISO7231CDW maintains all other electrical parameters identical to ISO7242CDWG4 but provides 3 channels (2 inputs, 1 output) instead of 4.
Q: What is the operating temperature limitation when selecting IL 715 series parts?
A: Most IL 715 variants operate to -40°C to 100°C. IL 715T and IL 715T-3 extend this to -40°C to 125°C, matching the original ISO7242CDWG4 temperature range.
Q: Are there supply voltage compatibility concerns with any substitute?
A: All substitute parts operate within the 3V to 5.5V range, which overlaps with the original 3.15V to 5.5V specification. Designs operating below 3.15V should verify compatibility with IL 715 series parts, which specify a 3V minimum.
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