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ISO7240ADWG4 Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO7240ADWG4 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 part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | ISO7240ADWG4 |
|---|---|
| Manufacturer | Texas Instruments |
| Product Status | Obsolete |
| Technology | Capacitive Coupling |
| Number of Channels | 4 |
| Channel Type | Unidirectional |
| Voltage - Isolation | 4000Vpk |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Data Rate | 1Mbps |
| Voltage - Supply | 3.15V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution for the ISO7240ADWG4 is determined by the following critical parameters:
- Isolation Voltage: Minimum 4000Vpk or equivalent Vrms rating
- Number of Channels: 4 channels, unidirectional configuration
- Package Type: 16-SOIC form factor with compatible pin pitch
- Data Rate: Minimum 1Mbps capability
- Supply Voltage Range: Compatibility with 3.15V ~ 5.5V operation
- Operating Temperature: Support for -40°C ~ 125°C range
- Technology: Capacitive coupling or alternative isolation technology meeting isolation specifications
Substitute parts are grouped into two categories:
Category 1: Direct Functional Equivalents (Same Isolation Voltage)
- ISO7240ADW: Identical electrical specifications, different packaging (Tube vs. Cut Tape)
Category 2: Enhanced Performance Substitutes (Higher Isolation Voltage or Data Rate)
- ISO6740DWR: Higher isolation voltage (5000Vrms) and data rate (50Mbps), active product status
- IL 715 Series (NVE Corp): Alternative technology (GMR), higher data rate (110Mbps), lower isolation voltage (2500Vrms)
Parameter Comparison
| Parameter | ISO7240ADWG4 | ISO7240ADW | ISO6740DWR | IL 715-3 | IL 715-3E | IL 715E |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | NVE Corp | NVE Corp | NVE Corp |
| Product Status | Obsolete | Last Time Buy | Active | Active | Active | Active |
| Technology | Capacitive Coupling | Capacitive Coupling | Capacitive Coupling | GMR | GMR | GMR |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Channel Type | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Voltage - Isolation | 4000Vpk | 4000Vpk | 5000Vrms | 2500Vrms | 2500Vrms | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs | 25kV/µs | 100kV/µs | 100kV/µs | 100kV/µs | 100kV/µs |
| Data Rate | 1Mbps | 1Mbps | 50Mbps | 110Mbps | 110Mbps | 110Mbps |
| Propagation Delay tpLH / tpHL (Max) | 95ns / 95ns | 95ns / 95ns | 18ns / 18ns | 15ns / 15ns | 15ns / 15ns | 15ns / 15ns |
| Voltage - Supply | 3.15V ~ 5.5V | 3.15V ~ 5.5V | 2.25V ~ 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) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 2 (1 Year) | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For Direct Replacement (Obsolete to Active Status):
ISO7240ADW is the primary substitute for ISO7240ADWG4. Both parts share identical electrical specifications and 16-SOIC packaging with 0.295" width. ISO7240ADW carries Last Time Buy status, providing a transition path before full discontinuation. Both maintain ROHS3 compliance and support the full -40°C ~ 125°C operating range.
For Enhanced Performance Applications:
ISO6740DWR offers higher isolation voltage (5000Vrms vs. 4000Vpk) and significantly faster data rate (50Mbps vs. 1Mbps) while maintaining the same 4-channel, unidirectional configuration and 16-SOIC package footprint. ISO6740DWR is in active production status with superior availability. This substitute is suitable when application requirements permit higher performance specifications.
For Alternative Technology Consideration:
IL 715-3E and IL 715E (NVE Corp IsoLoop series) provide GMR-based isolation technology with 2500Vrms isolation voltage and 110Mbps data rate. IL 715-3E offers ROHS3 compliance and unlimited MSL rating. Package width differs (0.154" for IL 715-3E vs. 0.295" for IL 715E), requiring PCB layout verification. Operating temperature range is limited to -40°C ~ 100°C, which may restrict use in extended temperature applications.
Compliance Considerations:
All recommended substitutes maintain ROHS3 compliance except IL 715 series variants without the "E" suffix designation. For applications requiring RoHS compliance, select ISO7240ADW, ISO6740DWR, IL 715-3E, or IL 715E.
Frequently Asked Questions (FAQ)
Q: Can ISO7240ADW directly replace ISO7240ADWG4 without circuit modification?
A: Yes. ISO7240ADW provides identical electrical specifications, channel configuration, and 16-SOIC package dimensions. The primary difference is packaging format (Tube vs. Cut Tape). No circuit changes are required.
Q: What is the key limitation when substituting with IL 715 series parts?
A: IL 715 series parts operate at lower isolation voltage (2500Vrms vs. 4000Vpk). Applications requiring 4000Vpk isolation must use ISO7240ADW or ISO6740DWR. Additionally, IL 715 series maximum operating temperature is 100°C, not 125°C.
Q: Is ISO6740DWR a suitable substitute for low-speed applications?
A: Yes. ISO6740DWR supports 50Mbps data rate, which exceeds the 1Mbps requirement of ISO7240ADWG4. The higher performance does not create compatibility issues in lower-speed designs. ISO6740DWR offers the advantage of active production status and higher isolation voltage.
Q: What is the package width difference between IL 715-3E and IL 715E?
A: IL 715-3E uses 0.154" (3.90mm) width 16-SOIC package, while IL 715E uses 0.295" (7.50mm) width. IL 715E matches the original ISO7240ADWG4 package width. PCB layout compatibility must be verified when selecting the narrower IL 715-3E variant.
Q: Are there supply voltage compatibility concerns with these substitutes?
A: ISO7240ADW and ISO6740DWR support 3.15V ~ 5.5V and 2.25V ~ 5.5V respectively, both compatible with ISO7240ADWG4 supply range. IL 715 series requires minimum 3V supply. Verify your application supply voltage falls within the specified range for the selected substitute.
Q: Which substitute offers the best long-term availability?
A: ISO6740DWR carries active product status with 35,400 units in stock, providing the strongest availability position. ISO7240ADW is Last Time Buy status. IL 715-3E and IL 715E are active but represent alternative technology. For new designs, ISO6740DWR is recommended.
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