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ISO7240ADW Equivalent & Substitute Parts
Part Overview
The ISO7240ADW is a general-purpose digital isolator manufactured by Texas Instruments, featuring 4000Vpk isolation voltage, 4-channel unidirectional configuration, and 1Mbps data rate in a 16-SOIC package. This device is classified as Last Time Buy, indicating end-of-life status. 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 | ISO7240ADW |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Type | General Purpose |
| Number of Channels | 4 |
| Channel Configuration | Unidirectional (4/0) |
| 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 |
| Product Status | Last Time Buy |
Substitute Part Grouping Explanation
Substitution of the ISO7240ADW is determined by the following critical parameters:
- Channel Configuration: 4-channel unidirectional (4/0 input/output split)
- Package Type: 16-SOIC surface mount form factor
- Isolation Voltage: Minimum 4000Vpk or equivalent Vrms rating
- Data Rate Capability: Minimum 1Mbps
- Supply Voltage Range: Compatibility with 3.15V ~ 5.5V operation
- Operating Temperature Range: Support for -40°C ~ 125°C
- Isolation Technology: Capacitive coupling or alternative isolation methods meeting electrical requirements
Substitute parts are grouped into two categories:
Category A - Direct Functional Equivalents (Capacitive Coupling Technology)
- ISO6740DWR: Higher performance capacitive isolator with enhanced CMTI and data rate
Category B - Alternative Technology Equivalents (GMR Technology)
- IL 715 series (NVE Corp): General-purpose GMR-based isolators with 2500Vrms isolation and superior data rate performance
Parameter Comparison
| Parameter | ISO7240ADW | ISO6740DWR | IL 715-3 | IL 715-3E | IL 715E | IL 715T | IL 715T-3 | IL 715T-3E |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | NVE Corp | NVE Corp | NVE Corp | NVE Corp | NVE Corp | NVE Corp |
| Technology | Capacitive Coupling | Capacitive Coupling | GMR | GMR | GMR | GMR | GMR | GMR |
| Type | General Purpose | CAN, RS232, RS485, SPI | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Channel Configuration | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) | Unidirectional (4/0) |
| Voltage - Isolation | 4000Vpk | 5000Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs | 100kV/µs | 100kV/µs | 100kV/µs | 100kV/µs | 100kV/µs | 100kV/µs | 100kV/µs |
| Data Rate | 1Mbps | 50Mbps | 110Mbps | 110Mbps | 110Mbps | 110Mbps | 110Mbps | 110Mbps |
| Propagation Delay tpLH / tpHL (Max) | 95ns / 95ns | 18ns / 18ns | 15ns / 15ns | 15ns / 15ns | 15ns / 15ns | 15ns / 15ns | 15ns / 15ns | 15ns / 15ns |
| Pulse Width Distortion (Max) | 10ns | 7ns | 3ns | 3ns | 3ns | 3ns | 3ns | 3ns |
| Voltage - Supply | 3.15V ~ 5.5V | 2.25V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 100°C | -40°C ~ 100°C | -40°C ~ 100°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | 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) | 16-SOIC (0.295", 7.50mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | RoHS non-compliant | ROHS3 Compliant |
| Product Status | Last Time Buy | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
ISO6740DWR (Texas Instruments) Select this part for direct technology continuity with capacitive coupling isolation. ISO6740DWR maintains the same manufacturer and isolation technology as ISO7240ADW while providing superior performance metrics. This part is actively produced and ROHS3 compliant. The higher isolation voltage (5000Vrms vs. 4000Vpk), increased CMTI (100kV/µs vs. 25kV/µs), and faster data rate (50Mbps vs. 1Mbps) make it suitable for applications requiring enhanced noise immunity and signal integrity. Supply voltage range extends to 2.25V, providing broader compatibility.
IL 715-3E or IL 715T-3E (NVE Corp - GMR Technology) Select these parts when alternative isolation technology is acceptable and extended temperature operation to 125°C is required. Both variants are ROHS3 compliant and actively produced. IL 715-3E and IL 715T-3E use GMR technology instead of capacitive coupling, offering 110Mbps data rate and 100kV/µs CMTI. The 2500Vrms isolation voltage is lower than ISO7240ADW but remains suitable for most general-purpose applications. Package width is 3.90mm (narrower than ISO7240ADW's 7.50mm), requiring PCB layout verification.
IL 715E or IL 715ETR13 (NVE Corp - GMR Technology, Standard Package) Select these parts when package footprint compatibility with ISO7240ADW is critical (0.295", 7.50mm width). Both maintain the same package dimensions as the original part. IL 715E is ROHS3 compliant and actively produced. IL 715ETR13 is also ROHS3 compliant. Operating temperature range is -40°C to 100°C, which is 25°C lower than ISO7240ADW's maximum. Verify application temperature requirements before selection.
IL 715T or IL 715T-3 (NVE Corp - Extended Temperature, RoHS Non-Compliant) These parts support the full -40°C to 125°C operating temperature range matching ISO7240ADW. However, both are RoHS non-compliant, requiring regulatory assessment for new designs. IL 715T maintains the 0.295" package width; IL 715T-3 uses the narrower 3.90mm package. Select only when extended temperature operation is mandatory and RoHS compliance is not a design constraint.
Frequently Asked Questions (FAQ)
Q: Can ISO6740DWR directly replace ISO7240ADW in existing designs? A: ISO6740DWR is pin-compatible and functionally superior, supporting the same 4-channel unidirectional configuration and 16-SOIC package. The higher isolation voltage, CMTI, and data rate provide enhanced performance. No design changes are required for electrical compatibility. Verify that the improved performance characteristics do not introduce signal integrity issues in timing-sensitive applications.
Q: What is the key difference between IL 715 series parts and ISO7240ADW? A: IL 715 series uses GMR (Giant Magnetoresistive) isolation technology instead of capacitive coupling. Both technologies provide electrical isolation but differ in noise immunity characteristics and data rate capability. IL 715 series offers 110Mbps data rate versus ISO7240ADW's 1Mbps, and 100kV/µs CMTI versus 25kV/µs. Isolation voltage is lower (2500Vrms vs. 4000Vpk), which is acceptable for most general-purpose applications.
Q: Are there package footprint differences between substitute parts? A: Yes. IL 715-3, IL 715-3E, IL 715T-3, and IL 715T-3E use a narrower 16-SOIC package (0.154", 3.90mm width) compared to ISO7240ADW and IL 715E variants (0.295", 7.50mm width). PCB layout modifications are required when switching to the narrower package. ISO6740DWR maintains the 0.295" width, requiring no layout changes.
Q: Which substitute part is recommended for new designs? A: ISO6740DWR is recommended for new designs due to active product status, ROHS3 compliance, and superior performance characteristics. It provides direct technology continuity with Texas Instruments' capacitive coupling platform while eliminating last-time-buy constraints.
Q: What are the RoHS compliance implications of substitute selection? A: ISO6740DWR, IL 715-3E, IL 715E, and IL 715T-3E are ROHS3 compliant. IL 715-3, IL 715T, and IL 715T-3 are RoHS non-compliant. For applications subject to RoHS regulations, select only ROHS3-compliant alternatives.
Q: Can IL 715 series parts operate at 125°C like ISO7240ADW? A: IL 715-3, IL 715-3E, IL 715E, and IL 715ETR13 are rated to 100°C maximum. IL 715T, IL 715T-3, and IL 715T-3E support -40°C to 125°C operation. For applications requiring 125°C operation, select IL 715T variants or ISO6740DWR.
Q: What is the isolation voltage difference between ISO7240ADW and IL 715 series? A: ISO7240ADW provides 4000Vpk isolation. IL 715 series provides 2500Vrms isolation. These are not directly comparable units (peak vs. RMS), but 2500Vrms is approximately equivalent to 3536Vpk, which is lower than ISO7240ADW. Verify that application isolation requirements are met by the lower voltage rating before substitution.
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