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ISO7220AD Digital Isolator 2500Vrms 2-Channel Equivalent & Substitute Parts
Part Overview
The ISO7220AD is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage and 2-channel unidirectional configuration in an 8-SOIC package. This device utilizes capacitive coupling technology for signal isolation and operates across a 3V to 5.5V supply range with a 1Mbps data rate.
The ISO7220AD is designated as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new designs and production requirements.
Substiute Parts
Key Parameters
| Parameter | ISO7220AD Value |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Number of Channels | 2 |
| Voltage - Isolation | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Data Rate | 1Mbps |
| Voltage - Supply | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Product Status | Last Time Buy |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict alignment with the following critical parameters:
- Isolation Voltage: 2500Vrms (mandatory match)
- Number of Channels: 2 (mandatory match)
- Package Type: 8-SOIC (0.154", 3.90mm Width) (mandatory match)
- Channel Configuration: Unidirectional, 2 inputs on Side 1, 0 inputs on Side 2 (mandatory match)
- Data Rate: Minimum 1Mbps (equal or higher acceptable)
- Common Mode Transient Immunity: Minimum 25kV/µs (equal or higher acceptable)
- Supply Voltage Range: Must encompass 3V ~ 5.5V
- Operating Temperature Range: Must encompass -40°C ~ 125°C or be compatible with application requirements
- Compliance: ROHS3 Compliant, REACH Unaffected
Substitute parts are grouped by technology platform (Capacitive Coupling, Magnetic Coupling, GMR) and performance tier (data rate and propagation delay characteristics).
Parameter Comparison
| Part Number | Manufacturer | Technology | Data Rate | CMTI (Min) | Propagation Delay (Max) | Supply Voltage | Operating Temp | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| ISO7220AD | Texas Instruments | Capacitive Coupling | 1Mbps | 25kV/µs | 475ns | 3V ~ 5.5V | -40°C ~ 125°C | Last Time Buy | Tube |
| ISO7220ADR | Texas Instruments | Capacitive Coupling | 1Mbps | 25kV/µs | 475ns | 3V ~ 5.5V | -40°C ~ 125°C | Active | Cut Tape (CT) & Digi-Reel® |
| ADUM1200ARZ | Analog Devices Inc. | Magnetic Coupling | 1Mbps | 25kV/µs | 150ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Tube |
| ADUM1200ARZ-RL7 | Analog Devices Inc. | Magnetic Coupling | 1Mbps | 25kV/µs | 150ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Cut Tape (CT) & Digi-Reel® |
| ADUM1200BRZ | Analog Devices Inc. | Magnetic Coupling | 10Mbps | 25kV/µs | 50ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Tube |
| ADUM1200BRZ-RL7 | Analog Devices Inc. | Magnetic Coupling | 10Mbps | 25kV/µs | 50ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Cut Tape (CT) & Digi-Reel® |
| ADUM1200CRZ | Analog Devices Inc. | Magnetic Coupling | 25Mbps | 25kV/µs | 45ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Tube |
| ADUM1200CRZ-RL7 | Analog Devices Inc. | Magnetic Coupling | 25Mbps | 25kV/µs | 45ns | 2.7V ~ 5.5V | -40°C ~ 105°C | Active | Cut Tape (CT) & Digi-Reel® |
| IL 611-3E | NVE Corp/Isolation Products | GMR (Giant Magnetoresistive) | 100Mbps | 15kV/µs | 15ns | 3V ~ 5.5V | -40°C ~ 85°C | Active | Tube |
| IL 611-3ETR7 | NVE Corp/Isolation Products | GMR (Giant Magnetoresistive) | 100Mbps | 15kV/µs | 15ns | 3V ~ 5.5V | -40°C ~ 85°C | Active | Not Specified |
| IL 721T-3E | NVE Corp/Isolation Products | GMR (Giant Magnetoresistive) | 110Mbps | 100kV/µs | 15ns | 3V ~ 5.5V | -40°C ~ 125°C | Active | Tube |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute)
ISO7220ADR is the direct equivalent to ISO7220AD, manufactured by Texas Instruments with identical electrical specifications and package configuration. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and active product status. This part is recommended as the primary replacement for new designs and production continuity.
Analog Devices iCoupler® Series (ADUM1200 Family)
The ADUM1200ARZ and ADUM1200ARZ-RL7 provide functional equivalence at the 1Mbps data rate with improved propagation delay performance (150ns versus 475ns). These parts utilize magnetic coupling technology instead of capacitive coupling. Operating temperature range is limited to -40°C ~ 105°C compared to the ISO7220AD specification of -40°C ~ 125°C. Supply voltage range extends to 2.7V minimum, providing broader compatibility.
ADUM1200BRZ, ADUM1200BRZ-RL7, ADUM1200CRZ, and ADUM1200CRZ-RL7 offer higher data rate performance (10Mbps and 25Mbps respectively) with superior propagation delay characteristics. These are suitable for applications requiring higher bandwidth than the 1Mbps baseline specification.
NVE IsoLoop® Series (IL 611 and IL 721 Families)
IL 611-3E and IL 611-3ETR7 employ GMR (Giant Magnetoresistive) technology with 100Mbps data rate capability and 15ns propagation delay. Operating temperature range is -40°C ~ 85°C, which does not meet the full -40°C ~ 125°C requirement of the ISO7220AD. Common Mode Transient Immunity is specified at 15kV/µs, below the 25kV/µs minimum requirement.
IL 721T-3E provides the highest performance with 110Mbps data rate, 100kV/µs CMTI, and full -40°C ~ 125°C operating temperature range. This part is suitable for applications requiring enhanced noise immunity and extended temperature operation.
All substitute parts maintain ROHS3 compliance and REACH unaffected status consistent with the original ISO7220AD specification.
Frequently Asked Questions (FAQ)
Q: Can ISO7220ADR be used as a direct replacement for ISO7220AD?
A: Yes. ISO7220ADR is the direct equivalent manufactured by Texas Instruments with identical electrical and functional specifications. The difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and active product status. Both parts are pin-compatible and functionally interchangeable in 8-SOIC applications.
Q: What is the primary difference between capacitive coupling (ISO7220) and magnetic coupling (ADUM1200) technologies?
A: Capacitive coupling and magnetic coupling are distinct isolation technologies with different performance characteristics. The ISO7220AD uses capacitive coupling with 475ns propagation delay. The ADUM1200 series uses magnetic coupling with 150ns propagation delay at 1Mbps, providing faster signal transmission. Technology selection depends on application requirements for propagation delay, power consumption, and electromagnetic compatibility.
Q: Are ADUM1200 parts suitable replacements if my application operates at temperatures above 105°C?
A: No. ADUM1200 series parts are specified for -40°C ~ 105°C operating temperature. If your application requires operation at temperatures up to 125°C, the ISO7220ADR or IL 721T-3E are appropriate selections. Verify thermal requirements before component selection.
Q: What does the "-RL7" suffix indicate on ADUM1200ARZ-RL7 and similar part numbers?
A: The "-RL7" suffix indicates packaging format (Cut Tape & Digi-Reel®) and is a manufacturer designation. Electrical specifications remain identical to the base part number (ADUM1200ARZ). Selection between tube and reel packaging depends on production volume and assembly equipment compatibility.
Q: Can IL 611-3E be used as a substitute if my circuit requires 25kV/µs Common Mode Transient Immunity?
A: No. IL 611-3E is specified with 15kV/µs CMTI, which does not meet the 25kV/µs minimum requirement of the ISO7220AD. For applications requiring 25kV/µs or higher CMTI, select ISO7220ADR, ADUM1200 series, or IL 721T-3E.
Q: Is the 8-SOIC package identical across all substitute parts?
A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring pin-compatible board-level replacement. Verify PCB footprint design accommodates this package specification before assembly.
Q: What is the inventory status of these substitute parts?
A: Inventory quantities are provided in the parameter comparison table. ISO7220ADR (28,150 pcs), ADUM1200ARZ-RL7 (19,747 pcs), and ADUM1200CRZ-RL7 (17,912 pcs) maintain the highest stock levels. Verify current availability with your component supplier for production planning.
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