ISO7220ADG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7220ADG4 is a General Purpose Digital Isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 2 channels, and 1Mbps data rate in an 8-SOIC package. This part is classified as Obsolete, making substitute components necessary for new designs and ongoing production requirements. The device uses capacitive coupling technology and operates across a -40°C to 125°C temperature range with 3V to 5.5V supply voltage.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	ISO7220ADG4
Product Status	Obsolete
Technology	Capacitive Coupling
Isolation Voltage	2500Vrms
Number of Channels	2
Data Rate	1Mbps
Common Mode Transient Immunity	25kV/µs
Package	8-SOIC (0.154", 3.90mm Width)
Supply Voltage	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ISO7220ADG4 is determined by the following critical parameters: isolation voltage (2500Vrms minimum), channel count (2 channels), unidirectional channel type, package format (8-SOIC), and compliance certifications (ROHS3). The data rate of 1Mbps establishes a minimum performance threshold; substitutes operating at equal or higher data rates are functionally compatible. Coupling technology (capacitive, magnetic, or GMR) may differ while maintaining electrical equivalence. Operating temperature range and supply voltage specifications must meet or exceed the original part requirements.

Substitute parts are grouped into three categories:

Category 1: Texas Instruments ISO7220 Series (Capacitive Coupling) Direct technology match with identical electrical characteristics. Includes ISO7220AD and ISO7220ADR variants differing only in packaging and product status.

Category 2: Analog Devices ADUM1200 Series (Magnetic Coupling) Alternative coupling technology with enhanced performance characteristics. Available in multiple speed grades (A, B, C) supporting 1Mbps, 10Mbps, and 25Mbps respectively. Magnetic coupling provides improved propagation delay and pulse width distortion performance.

Category 3: NVE IsoLoop IL 611 Series (GMR Technology) High-performance alternative using Giant Magnetoresistive technology. Supports 100Mbps data rate with superior propagation delay characteristics. Operating temperature limited to -40°C to 85°C.

Parameter Comparison

Part Number	Manufacturer	Technology	Data Rate	Propagation Delay (Max)	CMTI (Min)	Supply Voltage	Temp Range	Product Status	Packaging
ISO7220ADG4	Texas Instruments	Capacitive	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Obsolete	8-SOIC
ISO7220AD	Texas Instruments	Capacitive	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Last Time Buy	8-SOIC (Tube)
ISO7220ADR	Texas Instruments	Capacitive	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Active	8-SOIC (CT/Digi-Reel)
ADUM1200ARZ	Analog Devices	Magnetic	1Mbps	150ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1200ARZ-RL7	Analog Devices	Magnetic	1Mbps	150ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT/Digi-Reel)
ADUM1200BRZ	Analog Devices	Magnetic	10Mbps	50ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1200BRZ-RL7	Analog Devices	Magnetic	10Mbps	50ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT/Digi-Reel)
ADUM1200CRZ	Analog Devices	Magnetic	25Mbps	45ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1200CRZ-RL7	Analog Devices	Magnetic	25Mbps	45ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT/Digi-Reel)
IL 611-3E	NVE Corp	GMR	100Mbps	15ns	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC (Tube)
IL 611-3ETR7	NVE Corp	GMR	100Mbps	15ns	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC

Engineering Selection Recommendations

Primary Recommendation: ISO7220ADR The ISO7220ADR represents the direct active equivalent to the obsolete ISO7220ADG4. Both devices employ identical capacitive coupling technology with matching electrical specifications across all critical parameters. ISO7220ADR maintains Active product status with established supply chain availability. This part is suitable for direct replacement in existing designs without circuit modifications.

Secondary Recommendation: ADUM1200ARZ-RL7 The ADUM1200ARZ-RL7 provides functional equivalence with magnetic coupling technology. While propagation delay improves to 150ns from 475ns, this enhancement does not create incompatibility in 1Mbps applications. The part maintains 2500Vrms isolation, 25kV/µs CMTI, and 8-SOIC packaging. Extended supply voltage range (2.7V minimum) offers design flexibility. Active product status ensures long-term availability. Temperature range limitation to -40°C to 105°C must be evaluated against application requirements.

High-Performance Alternative: ADUM1200CRZ-RL7 For applications requiring enhanced performance margins, the ADUM1200CRZ-RL7 supports 25Mbps data rate with 45ns propagation delay. This part maintains all critical isolation and CMTI specifications while providing significant performance headroom. Active status and established supply chain support production continuity.

Specialized Application: IL 611-3E The IL 611-3E offers the highest performance option with 100Mbps capability and 15ns propagation delay using GMR technology. This part is suitable only for applications where the reduced CMTI specification (15kV/µs versus 25kV/µs) and lower operating temperature maximum (85°C) are acceptable.

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) matching the original part specifications.

Frequently Asked Questions (FAQ)

Q: Can ISO7220ADR directly replace ISO7220ADG4 without circuit modifications? A: Yes. Both parts use identical capacitive coupling technology with matching electrical specifications. The only difference is product status and packaging format. No circuit changes are required.

Q: What is the primary difference between Texas Instruments ISO7220 and Analog Devices ADUM1200 series? A: The ISO7220 uses capacitive coupling while ADUM1200 uses magnetic coupling. Both achieve 2500Vrms isolation and 25kV/µs CMTI. ADUM1200 provides faster propagation delay (150ns versus 475ns) and lower minimum supply voltage (2.7V versus 3V).

Q: Are ADUM1200 variants with different data rates (A, B, C grades) interchangeable? A: All ADUM1200 variants maintain identical isolation voltage, channel count, and CMTI specifications. They differ only in data rate capability and propagation delay. A higher-speed variant (B or C grade) can replace a lower-speed variant in the same application. Reverse substitution is not recommended.

Q: Does the IL 611-3E meet all ISO7220ADG4 specifications? A: The IL 611-3E meets isolation voltage and channel requirements but has reduced CMTI (15kV/µs versus 25kV/µs) and lower maximum operating temperature (85°C versus 125°C). Substitution is valid only if application requirements permit these parameter reductions.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Tube packaging and Cut Tape with Digi-Reel (CT/Digi-Reel) formats. Both formats use identical 8-SOIC (0.154", 3.90mm Width) package. Selection depends on production volume and handling requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) matching the original ISO7220ADG4 specifications.

Q: What is the impact of lower supply voltage minimum on ADUM1200 parts? A: ADUM1200 series supports 2.7V minimum supply voltage compared to 3V for ISO7220. This provides additional design flexibility for low-voltage applications. Existing designs operating at 3V or higher experience no impact.

Q: Can magnetic coupling (ADUM1200) replace capacitive coupling (ISO7220) in noise-sensitive applications? A: Both technologies achieve identical isolation voltage and CMTI specifications. Magnetic coupling typically exhibits superior high-frequency performance. Application-specific testing is not required for functional equivalence based on provided electrical parameters.

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