ISO7220ADRG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7220ADRG4 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 discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The device uses capacitive coupling technology and operates across -40°C to 125°C with supply voltage range of 3V to 5.5V.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISO7220ADRG4
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)
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the ISO7220ADRG4 is determined by the following critical parameters:

Isolation Voltage: 2500Vrms (all substitutes meet this requirement)
Number of Channels: 2 channels, unidirectional configuration
Package: 8-SOIC form factor (0.154", 3.90mm Width)
Supply Voltage Range: Minimum 3V support required
Operating Temperature: Minimum -40°C to 125°C range preferred
Channel Configuration: 2 inputs on Side 1, 0 inputs on Side 2

Substitutes are grouped into three categories based on technology and performance characteristics:

Direct Parametric Equivalent (ISO7220ADR): Identical specifications, same capacitive coupling technology, active product status
Manufacturer Recommended - Magnetic Coupling (ADUM1200 series): Analog Devices iCoupler technology with improved propagation delay and pulse width distortion, available in multiple data rate grades
Manufacturer Recommended - GMR Technology (IL 611 and IL 711 series): NVE IsoLoop GMR-based isolators with superior high-speed performance and CMTI characteristics

Parameter Comparison

Parameter	ISO7220ADRG4	ISO7220ADR	ADUM1200ARZ	ADUM1200BRZ	ADUM1200CRZ	IL 611-3E	IL 711-3
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	NVE Corp	NVE Corp
Technology	Capacitive Coupling	Capacitive Coupling	Magnetic Coupling	Magnetic Coupling	Magnetic Coupling	GMR	GMR
Number of Channels	2	2	2	2	2	2	2
Voltage - Isolation	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
CMTI (Min)	25kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs	15kV/µs	100kV/µs
Data Rate	1Mbps	1Mbps	1Mbps	10Mbps	25Mbps	100Mbps	110Mbps
Propagation Delay tpLH / tpHL (Max)	475ns / 475ns	475ns / 475ns	150ns / 150ns	50ns / 50ns	45ns / 45ns	15ns / 15ns	15ns / 15ns
Pulse Width Distortion (Max)	14ns	14ns	40ns	3ns	3ns	5ns	3ns
Voltage - Supply	3V ~ 5.5V	3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 100°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitute - ISO7220ADR: This part is the direct parametric equivalent with identical electrical specifications and same capacitive coupling technology. It maintains the same operating temperature range (-40°C to 125°C) and is currently in active production status with ROHS3 compliance. Selection of ISO7220ADR is appropriate for direct replacement in existing designs without circuit modification.

Secondary Substitutes - ADUM1200 Series (Analog Devices): The ADUM1200ARZ, ADUM1200BRZ, and ADUM1200CRZ represent manufacturer-recommended alternatives using magnetic coupling technology. These parts meet the 2500Vrms isolation requirement and 25kV/µs CMTI specification. The ADUM1200ARZ provides 1Mbps operation matching the original part's data rate. Higher-speed variants (ADUM1200BRZ at 10Mbps and ADUM1200CRZ at 25Mbps) offer improved propagation delay performance. Operating temperature range is -40°C to 105°C. All variants are ROHS3 compliant and in active production. Supply voltage extends to 2.7V minimum, providing broader compatibility.

Tertiary Substitutes - IL 611 and IL 711 Series (NVE IsoLoop): These GMR-based isolators provide 2500Vrms isolation with enhanced high-speed performance. IL 611-3E operates at 100Mbps with 15kV/µs CMTI and 15ns propagation delay. IL 711-3 delivers 110Mbps operation with exceptional 100kV/µs CMTI and 15ns propagation delay. Both maintain 3V to 5.5V supply compatibility. IL 611-3E is ROHS3 compliant; IL 711-3 is RoHS non-compliant. Operating temperature for IL 611-3E is -40°C to 85°C; IL 711-3 extends to -40°C to 100°C. These options are suitable for applications requiring higher data rates and superior common mode transient immunity.

Frequently Asked Questions (FAQ)

Q: Can ISO7220ADR be used as a direct replacement for ISO7220ADRG4?

A: Yes. ISO7220ADR is the parametric equivalent with identical electrical specifications, same 8-SOIC package, and matching operating temperature range. The primary difference is product status: ISO7220ADR is active while ISO7220ADRG4 is discontinued. No circuit modifications are required.

Q: What are the key differences between capacitive coupling (ISO7220) and magnetic coupling (ADUM1200) technologies?

A: Both technologies achieve 2500Vrms isolation and 25kV/µs CMTI in this product category. Magnetic coupling (ADUM1200 series) provides faster propagation delay (150ns for 1Mbps variant versus 475ns for ISO7220) and lower pulse width distortion. Capacitive coupling (ISO7220) maintains the original design characteristics. Technology selection depends on timing-critical application requirements.

Q: Are the ADUM1200 variants pin-compatible with ISO7220ADRG4?

A: All parts use the 8-SOIC package with identical pinout for 2-channel, unidirectional configuration. Pin compatibility is confirmed. However, verify supply voltage requirements: ADUM1200 series supports 2.7V minimum while ISO7220 requires 3V minimum.

Q: What is the operating temperature limitation when substituting with ADUM1200 or IL 611 series?

A: ISO7220ADRG4 operates to 125°C. ADUM1200 series operates to 105°C maximum. IL 611-3E operates to 85°C maximum. IL 711-3 operates to 100°C maximum. Applications requiring operation above 105°C cannot use these substitutes without design review.

Q: Why is IL 711-3 marked as RoHS non-compliant?

A: IL 711-3 does not meet ROHS3 compliance requirements. If RoHS compliance is mandatory for your application, select ISO7220ADR, ADUM1200 series variants, or IL 611-3E, all of which are ROHS3 compliant.

Q: Can higher-speed ADUM1200 variants (BRZ, CRZ) be used in 1Mbps applications?

A: Yes. ADUM1200BRZ (10Mbps) and ADUM1200CRZ (25Mbps) are backward compatible with 1Mbps operation. These variants provide superior propagation delay and pulse width distortion characteristics, making them suitable for timing-sensitive applications even at lower data rates.

Q: What packaging options are available for these substitutes?

A: ISO7220ADR is available in Cut Tape (CT) & Digi-Reel packaging. ADUM1200ARZ and ADUM1200BRZ/CRZ are available in Tube packaging. ADUM1200ARZ-RL7, ADUM1200BRZ-RL7, and ADUM1200CRZ-RL7 variants are available in Cut Tape (CT) & Digi-Reel packaging. IL 611-3E is available in Tube packaging. Select packaging based on procurement and assembly requirements.

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