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ISO721DUB Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO721DUB is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 1 channel unidirectional configuration, and 100Mbps data rate in an 8-SMD gull wing package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
The ISO721DUB operates across a 3V to 5.5V supply range with -40°C to 125°C temperature rating, utilizing capacitive coupling technology for signal isolation. With 25kV/µs common mode transient immunity and 24ns maximum propagation delay, this isolator serves general purpose isolation applications requiring moderate isolation voltage and data rates.
Substiute Parts
Key Parameters
| Parameter | ISO721DUB |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Isolation Voltage | 2500Vrms |
| Number of Channels | 1 |
| Channel Type | Unidirectional |
| Data Rate | 100Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 24ns / 24ns |
| Voltage Supply Range | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 8-SMD, Gull Wing |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the ISO721DUB is determined by the following critical parameters:
Mandatory Compatibility Criteria:
- Unidirectional 1-channel configuration
- Capacitive coupling technology
- Surface mount package type
- Isolation voltage rating ≥ 2500Vrms
- Data rate ≥ 100Mbps
- Supply voltage range compatibility with 3V ~ 5.5V
- Operating temperature range ≥ -40°C to 125°C
- ROHS3 compliance
Substitute Categories:
Category 1: Texas Instruments ISO7710 Series (Direct Manufacturer Alternatives)
- ISO7710D: 3000Vrms, 100Mbps, 8-SOIC package, active product status
- ISO7710DW: 5000Vrms, 100Mbps, 16-SOIC package, last time buy status
Category 2: Skyworks Solutions SI87xx Series (Cross-Manufacturer Alternatives)
- SI8710AC-B-IPR, SI8710BC-B-IPR, SI8710CC-B-IPR: SI8710 base product
- SI8711BC-B-IPR, SI8711CC-B-IPR: SI8711 base product
- SI8712AC-B-IPR, SI8712BC-B-IPR, SI8712CC-B-IPR: SI8712 base product
All Skyworks alternatives feature 3750Vrms isolation, 8-SMD gull wing package, and 3V ~ 30V supply range, with data rates ranging from 1Mbps to 15Mbps.
Parameter Comparison
| Parameter | ISO721DUB | ISO7710D | ISO7710DW | SI8710BC-B-IPR | SI8712BC-B-IPR |
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Skyworks Solutions | Skyworks Solutions |
| Isolation Voltage | 2500Vrms | 3000Vrms | 5000Vrms | 3750Vrms | 3750Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 |
| Channel Type | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Data Rate | 100Mbps | 100Mbps | 100Mbps | 15Mbps | 15Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs | 85kV/µs | 85kV/µs | 35kV/µs | 35kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 24ns / 24ns | 16ns / 16ns | 16ns / 16ns | 60ns / 60ns | 60ns / 60ns |
| Voltage Supply Range | 3V ~ 5.5V | 2.25V ~ 5.5V | 2.25V ~ 5.5V | 3V ~ 30V | 3V ~ 30V |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | 8-SMD, Gull Wing | 8-SOIC (0.154", 3.90mm) | 16-SOIC (0.295", 7.50mm) | 8-SMD, Gull Wing | 8-SMD, Gull Wing |
| Product Status | Obsolete | Active | Last Time Buy | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not specified | Not specified |
Engineering Selection Recommendations
For Direct Replacement (Same Manufacturer, Active Status):
ISO7710D is the primary substitute for ISO721DUB. Both are Texas Instruments capacitive coupling isolators with identical 100Mbps data rate and unidirectional 1-channel configuration. ISO7710D provides higher isolation voltage (3000Vrms vs 2500Vrms) and superior common mode transient immunity (85kV/µs vs 25kV/µs). The 8-SOIC package differs from the original 8-SMD gull wing, requiring PCB layout modification. ISO7710D is currently in active production status with ROHS3 compliance.
For Enhanced Isolation Voltage Requirement:
ISO7710DW offers 5000Vrms isolation with identical 100Mbps performance but carries last time buy status. The 16-SOIC package represents a significant footprint change from the original 8-pin configuration. This option is suitable only for applications requiring maximum isolation voltage where procurement timeline permits.
For Cross-Manufacturer Compatibility:
Skyworks SI8712BC-B-IPR and SI8710BC-B-IPR maintain the original 8-SMD gull wing package form factor, eliminating PCB redesign requirements. Both feature 3750Vrms isolation and 35kV/µs common mode transient immunity. However, data rate is limited to 15Mbps compared to the ISO721DUB's 100Mbps specification. These alternatives are suitable only for applications where 15Mbps data rate meets functional requirements. Skyworks devices provide extended supply voltage range (3V ~ 30V) and active product status.
Compliance Considerations:
Texas Instruments ISO7710 series maintains ROHS3 compliance matching the original part. Skyworks SI87xx series compliance status is not specified in provided data. For applications requiring documented ROHS3 certification, Texas Instruments substitutes are preferred.
Frequently Asked Questions (FAQ)
Q: Can ISO7710D directly replace ISO721DUB without circuit modification?
A: ISO7710D is functionally compatible but requires PCB layout changes due to package difference (8-SOIC vs 8-SMD gull wing). Pin assignments and electrical characteristics are compatible. Verify pinout alignment before PCB redesign.
Q: What is the primary limitation of Skyworks SI87xx substitutes?
A: Skyworks SI87xx series maximum data rate is 15Mbps, significantly lower than ISO721DUB's 100Mbps specification. These substitutes are suitable only for applications with data rate requirements ≤ 15Mbps. For 100Mbps applications, Texas Instruments ISO7710D is required.
Q: Why is ISO7710DW marked as last time buy?
A: ISO7710DW carries last time buy status, indicating Texas Instruments is discontinuing this product. While currently available, procurement should prioritize ISO7710D for long-term design support and availability.
Q: Are supply voltage ranges compatible across all substitutes?
A: ISO721DUB operates 3V ~ 5.5V. ISO7710D/DW support 2.25V ~ 5.5V (broader lower range). Skyworks SI87xx support 3V ~ 30V (broader upper range). All substitutes are compatible with the original 3V ~ 5.5V operating window.
Q: What package considerations apply to each substitute?
A: ISO721DUB uses 8-SMD gull wing. ISO7710D uses 8-SOIC (0.154" width). ISO7710DW uses 16-SOIC (0.295" width). Skyworks SI87xx maintain 8-SMD gull wing package. Package changes require PCB layout modification and thermal management re-evaluation.
Q: Is ROHS3 compliance maintained across all substitutes?
A: Texas Instruments ISO7710D and ISO7710DW maintain ROHS3 compliance. Skyworks SI87xx compliance status is not specified in available data. Verify compliance documentation directly with Skyworks for regulated applications.
Q: What is the minimum isolation voltage requirement for substitution?
A: All listed substitutes meet or exceed the ISO721DUB's 2500Vrms isolation requirement. ISO7710D provides 3000Vrms, ISO7710DW provides 5000Vrms, and Skyworks SI87xx provide 3750Vrms. Higher isolation voltage does not create incompatibility.
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