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ISO721DUBR Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO721DUBR 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 part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across isolation voltage, channel configuration, data rate, and package form factor while meeting current product availability and compliance standards.
Substiute Parts
Key Parameters
| Parameter | ISO721DUBR |
|---|---|
| Manufacturer | Texas Instruments |
| Product Status | Obsolete |
| Technology | Capacitive Coupling |
| Number of Channels | 1 |
| Channel Type | Unidirectional |
| Voltage - Isolation | 2500Vrms |
| Data Rate | 100Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Voltage - Supply | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 8-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution logic for the ISO721DUBR is based on the following allowed parameters:
- Isolation Voltage: Substitute parts must maintain minimum 2500Vrms isolation or higher
- Channel Configuration: Must be 1 channel, unidirectional
- Data Rate: Must support minimum 100Mbps
- Package Type: 8-pin surface mount gull wing configuration preferred; alternative packages acceptable if form factor permits board integration
- Supply Voltage Range: Must accommodate 3V to 5.5V operation
- Operating Temperature: Must support -40°C to 125°C range
- Technology: Capacitive coupling isolators only
- Compliance: ROHS3 compliance required
Substitute parts are grouped into two categories: Texas Instruments ISO7710 series (higher isolation voltage, active product status) and Skyworks Solutions SI87xx series (alternative manufacturer, comparable isolation voltage and performance characteristics).
Parameter Comparison
| Parameter | ISO721DUBR | ISO7710DR | ISO7710DWR | SI8716BC-A-IPR | SI8718BC-A-IP | SI8719BC-A-IP |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Channel Type | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Voltage - Isolation | 2500Vrms | 3000Vrms | 5000Vrms | 3750Vrms | 3750Vrms | 3750Vrms |
| Data Rate | 100Mbps | 100Mbps | 100Mbps | 15Mbps | 15Mbps | 15Mbps |
| CMTI (Min) | 25kV/µs | 85kV/µs | 85kV/µs | 35kV/µs | 35kV/µs | 35kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 24ns / 24ns | 16ns / 16ns | 16ns / 16ns | 50ns / 50ns | 50ns / 50ns | 50ns / 50ns |
| Voltage - Supply | 3V ~ 5.5V | 2.25V ~ 5.5V | 2.25V ~ 5.5V | 2.5V ~ 5.5V | 2.5V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -40°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 | 8-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not specified | Not specified | Not specified |
| MSL Rating | 4 (72 Hours) | 2 (1 Year) | 2 (1 Year) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) |
Engineering Selection Recommendations
Texas Instruments ISO7710 Series (Recommended Primary Substitutes)
ISO7710DR and ISO7710DWR are active products from Texas Instruments with ROHS3 compliance matching the original part. ISO7710DR maintains the same 8-pin SOIC package footprint with improved isolation voltage (3000Vrms), enhanced CMTI (85kV/µs), and lower propagation delay (16ns). ISO7710DWR provides the highest isolation rating (5000Vrms) in a 16-SOIC package, suitable for applications requiring extended isolation margin. Both support 100Mbps data rate and -55°C to 125°C operating range, exceeding original specifications.
Skyworks Solutions SI87xx Series (Alternative Substitutes)
SI8716BC-A-IPR, SI8718BC-A-IP, and SI8719BC-A-IP provide functional substitution with 3750Vrms isolation and 35kV/µs CMTI. These parts maintain 8-SMD gull wing package compatibility and -40°C to 125°C operating range. Data rate is reduced to 15Mbps, which is acceptable for applications not requiring 100Mbps bandwidth. Supply voltage range extends to 2.5V minimum. MSL rating of 3 (168 Hours) provides adequate moisture protection for standard assembly processes.
Package Considerations
ISO7710DR uses 8-SOIC package requiring PCB footprint modification from the original 8-SMD gull wing. ISO7710DWR uses 16-SOIC package, necessitating board redesign. Skyworks SI87xx parts maintain original 8-SMD gull wing package, enabling direct board-level substitution without layout changes.
Frequently Asked Questions (FAQ)
Q: Can ISO7710DR directly replace ISO721DUBR on existing PCBs?
A: ISO7710DR uses 8-SOIC package versus the original 8-SMD gull wing package. PCB footprint modification is required. Electrical functionality is compatible for applications operating at 100Mbps or lower data rates.
Q: What is the primary advantage of ISO7710DWR over ISO7710DR?
A: ISO7710DWR provides 5000Vrms isolation voltage compared to ISO7710DR's 3000Vrms, offering greater isolation margin for high-voltage applications. The 16-SOIC package requires board redesign but accommodates additional circuit integration.
Q: Are Skyworks SI87xx parts suitable replacements for 100Mbps applications?
A: Skyworks SI87xx parts support maximum 15Mbps data rate, which is below the original 100Mbps specification. These parts are suitable only for applications operating at 15Mbps or lower. For 100Mbps requirements, Texas Instruments ISO7710 series is required.
Q: What is the difference between SI8716BC-A-IPR and SI8718BC-A-IP?
A: Both parts are electrically identical with 3750Vrms isolation, 15Mbps data rate, and 35kV/µs CMTI. SI8716BC-A-IPR is packaged in Tape & Reel format; SI8718BC-A-IP is packaged in Tube format. Selection depends on procurement and assembly requirements.
Q: Does MSL rating affect substitution compatibility?
A: MSL rating indicates moisture sensitivity during storage and assembly. ISO721DUBR has MSL 4 (72 Hours); ISO7710 series has MSL 2 (1 Year); Skyworks SI87xx has MSL 3 (168 Hours). Lower MSL numbers provide longer shelf life and reduced reflow sensitivity, improving manufacturing reliability.
Q: Can I use ISO7710DWR in a design originally specified for ISO721DUBR?
A: ISO7710DWR is electrically compatible but requires PCB redesign due to 16-SOIC package. The higher 5000Vrms isolation voltage exceeds original requirements and is acceptable. Verify that board layout can accommodate the larger package footprint.
Q: What supply voltage range must be maintained for substitution?
A: ISO721DUBR operates at 3V to 5.5V. ISO7710 series supports 2.25V to 5.5V, and Skyworks SI87xx supports 2.5V to 5.5V. All substitutes are compatible with the original 3V to 5.5V range. Extended lower voltage capability in substitutes does not affect compatibility.
Q: Are there compliance differences between substitute options?
A: ISO7710 series maintains ROHS3 compliance matching the original part. Skyworks SI87xx compliance status is not specified in available data. For applications requiring documented ROHS3 compliance, Texas Instruments ISO7710 series is the appropriate selection.
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