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ISO7240ADWR Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO7240ADWR 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 currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring digital isolation functionality.
Substiute Parts
Key Parameters
| Parameter | ISO7240ADWR |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Type | General Purpose |
| Number of Channels | 4 |
| Channel Configuration | 4 Input / 0 Output (Unidirectional) |
| Voltage - Isolation | 4000Vpk |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Data Rate | 1Mbps |
| Propagation Delay tpLH / tpHL (Max) | 95ns / 95ns |
| Pulse Width Distortion (Max) | 10ns |
| 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) | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution of the ISO7240ADWR is determined by the following critical parameters:
- Package Compatibility: 16-SOIC form factor (mechanical fit and pin assignment)
- Channel Configuration: 4-channel unidirectional input architecture
- Isolation Voltage: Minimum 4000Vpk or equivalent Vrms rating
- Supply Voltage Range: Compatibility with 3.15V ~ 5.5V operation
- Operating Temperature Range: Support for -40°C ~ 125°C
- Data Rate: Minimum 1Mbps capability
- Common Mode Transient Immunity: Minimum 25kV/µs
Substitute parts are grouped into two categories:
Category A - Direct Functional Equivalents (Capacitive Coupling Technology) ISO6740DWR provides higher performance specifications (5000Vrms isolation, 50Mbps data rate, 100kV/µs CMTI) while maintaining the same package footprint and 4-channel unidirectional configuration. This part is in Active status with higher inventory availability.
Category B - Alternative Technology Substitutes (GMR Technology) IL 715 series parts from NVE Corp utilize Giant Magnetoresistive (GMR) technology instead of capacitive coupling. These devices offer 2500Vrms isolation with superior data rate (110Mbps) and CMTI (100kV/µs) performance. Multiple package variants and RoHS compliance options are available within this series.
Parameter Comparison
| Parameter | ISO7240ADWR | ISO6740DWR | IL 715 Series |
|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | NVE Corp/Isolation Products |
| Technology | Capacitive Coupling | Capacitive Coupling | GMR (Giant Magnetoresistive) |
| Number of Channels | 4 | 4 | 4 |
| Channel Configuration | 4/0 Unidirectional | 4/0 Unidirectional | 4/0 Unidirectional |
| Voltage - Isolation | 4000Vpk | 5000Vrms | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs | 100kV/µs | 100kV/µs |
| Data Rate | 1Mbps | 50Mbps | 110Mbps |
| Propagation Delay tpLH / tpHL (Max) | 95ns / 95ns | 18ns / 18ns | 15ns / 15ns |
| Pulse Width Distortion (Max) | 10ns | 7ns | 3ns |
| Voltage - Supply | 3.15V ~ 5.5V | 2.25V ~ 5.5V | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 100°C (standard) / -40°C ~ 125°C (IL 715T variants) |
| Package / Case | 16-SOIC (0.295", 7.50mm) | 16-SOIC (0.295", 7.50mm) | 16-SOIC (0.295", 7.50mm or 0.154", 3.90mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant (E variants) / RoHS non-compliant (standard variants) |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 2 (1 Year) | 1 (Unlimited) |
| Product Status | Last Time Buy | Active | Active |
Engineering Selection Recommendations
For Direct Replacement (Same Manufacturer, Active Status)
ISO6740DWR is the primary substitute for ISO7240ADWR. Both devices are manufactured by Texas Instruments, utilize capacitive coupling technology, and share identical 16-SOIC (0.295", 7.50mm) packaging. ISO6740DWR is in Active product status with significantly higher inventory (35,400 units) compared to ISO7240ADWR (Last Time Buy status). The device exceeds ISO7240ADWR specifications across all performance metrics: 5000Vrms isolation voltage, 50Mbps data rate, and 100kV/µs CMTI. Both parts are ROHS3 compliant with MSL 2 rating. Pin-compatible operation is confirmed through identical 4-channel unidirectional configuration and supply voltage range compatibility (ISO6740DWR: 2.25V ~ 5.5V encompasses ISO7240ADWR: 3.15V ~ 5.5V).
For Alternative Technology Implementation (GMR-Based Solutions)
IL 715 series parts from NVE Corp provide functional substitution through Giant Magnetoresistive technology. These devices maintain 4-channel unidirectional configuration and 16-SOIC packaging but offer different isolation voltage specification (2500Vrms versus 4000Vpk). IL 715 series delivers superior performance in data rate (110Mbps) and CMTI (100kV/µs). Multiple variants accommodate different compliance and temperature requirements:
- IL 715-3E and IL 715-3ETR7: ROHS3 compliant, 16-SOIC (0.154", 3.90mm) package
- IL 715E and IL 715ETR13: ROHS3 compliant, 16-SOIC (0.295", 7.50mm) package
- IL 715T and IL 715T-3: Extended temperature range (-40°C ~ 125°C), RoHS non-compliant
- IL 715T-3E: Extended temperature range with ROHS3 compliance
All IL 715 variants feature MSL 1 (Unlimited) moisture sensitivity, superior to ISO7240ADWR MSL 2 rating.
Compliance and Regulatory Considerations
ISO6740DWR and IL 715-3E/IL 715E/IL 715ETR13/IL 715T-3E variants are ROHS3 compliant. Applications requiring RoHS compliance must select these specific part numbers. IL 715 standard variants (non-E designations) are RoHS non-compliant and unsuitable for regulated applications.
Frequently Asked Questions (FAQ)
Q: Can ISO6740DWR directly replace ISO7240ADWR in existing designs?
A: Yes. ISO6740DWR is pin-compatible and functionally superior. Both devices feature identical 16-SOIC (0.295", 7.50mm) packaging, 4-channel unidirectional configuration, and overlapping supply voltage ranges. ISO6740DWR exceeds ISO7240ADWR performance specifications, making it a direct upgrade. No PCB redesign is required.
Q: What is the key difference between IL 715 series and ISO7240ADWR?
A: The primary difference is isolation voltage specification and underlying technology. ISO7240ADWR uses capacitive coupling with 4000Vpk isolation, while IL 715 series uses GMR technology with 2500Vrms isolation. IL 715 series compensates with superior data rate (110Mbps versus 1Mbps) and CMTI (100kV/µs versus 25kV/µs). Applications requiring 4000Vpk isolation must use ISO6740DWR or remain with ISO7240ADWR.
Q: Are there package size variations among substitute parts?
A: Yes. IL 715 series offers two 16-SOIC package widths: 0.295" (7.50mm) and 0.154" (3.90mm). ISO7240ADWR and ISO6740DWR use only the 0.295" (7.50mm) width. Verify PCB footprint compatibility when selecting IL 715-3 variants (0.154" width) to ensure mechanical fit.
Q: Which substitute part is recommended for new designs?
A: ISO6740DWR is recommended for new designs. It is in Active product status with high inventory availability, ROHS3 compliant, and provides superior performance specifications while maintaining pin compatibility with legacy ISO7240ADWR designs.
Q: Do IL 715 variants require design changes for temperature range?
A: Standard IL 715 variants operate to -40°C ~ 100°C. If your application requires -40°C ~ 125°C operation, select IL 715T or IL 715T-3E variants. IL 715T-3E combines extended temperature range with ROHS3 compliance.
Q: What is the moisture sensitivity impact when substituting parts?
A: ISO7240ADWR has MSL 2 (1 Year) rating. ISO6740DWR maintains MSL 2. IL 715 series offers superior MSL 1 (Unlimited) rating, eliminating moisture sensitivity constraints. This is advantageous for long-term storage and supply chain flexibility.
Q: Are all substitute parts ROHS3 compliant?
A: No. Only ISO6740DWR, IL 715-3E, IL 715-3ETR7, IL 715E, IL 715ETR13, and IL 715T-3E are ROHS3 compliant. Standard IL 715, IL 715-3, IL 715T, and IL 715T-3 variants are RoHS non-compliant. Verify regulatory requirements before part selection.
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