ISO7221ADRG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7221ADRG4 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 a -40°C to 125°C temperature range with 3V to 5.5V supply voltage.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISO7221ADRG4
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	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ISO7221ADRG4 is determined by the following critical parameters: isolation voltage (2500Vrms minimum), number of channels (2), channel configuration (unidirectional), package type (8-SOIC), and data rate capability (minimum 1Mbps). The substitute parts are grouped into three categories based on technology platform and performance characteristics:

Category 1: Parametric Equivalent (Same Technology) ISO7221ADR maintains identical electrical specifications and capacitive coupling technology, differing only in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel).

Category 2: Manufacturer Recommended - Magnetic Coupling (ADUM1201 Series) Analog Devices ADUM1201 variants use magnetic coupling technology instead of capacitive coupling. These parts meet or exceed isolation voltage, channel count, and CMTI requirements. Variants differ by data rate: ADUM1201ARZ (1Mbps), ADUM1201BRZ (10Mbps), and ADUM1201CRZ (25Mbps). Supply voltage range extends to 2.7V minimum. Operating temperature maximum is 105°C.

Category 3: Manufacturer Recommended - GMR Technology (IL 611 and IL 711 Series) NVE Corp IsoLoop products use Giant Magnetoresistive (GMR) technology. IL 611-3E operates at 100Mbps with 15kV/µs CMTI. IL 711-3 provides 110Mbps data rate with 100kV/µs CMTI, the highest common mode transient immunity among all substitutes. Channel configuration differs: IL 611 and IL 711 feature 2 inputs on Side 1 and 0 on Side 2 (versus 1/1 configuration of ISO7221ADRG4).

Parameter Comparison

Part Number	Manufacturer	Technology	Channels	Isolation (Vrms)	CMTI (kV/µs)	Data Rate	Supply (V)	Temp Range (°C)	Package	Status
ISO7221ADRG4	Texas Instruments	Capacitive	2	2500	25	1Mbps	3.0 ~ 5.5	-40 ~ 125	8-SOIC TR	Discontinued
ISO7221ADR	Texas Instruments	Capacitive	2	2500	25	1Mbps	3.0 ~ 5.5	-40 ~ 125	8-SOIC CT	Active
ADUM1201ARZ	Analog Devices	Magnetic	2	2500	25	1Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC	Active
ADUM1201ARZ-RL7	Analog Devices	Magnetic	2	2500	25	1Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC CT	Active
ADUM1201BRZ	Analog Devices	Magnetic	2	2500	25	10Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC	Active
ADUM1201BRZ-RL7	Analog Devices	Magnetic	2	2500	25	10Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC CT	Active
ADUM1201CRZ	Analog Devices	Magnetic	2	2500	25	25Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC	Active
ADUM1201CRZ-RL7	Analog Devices	Magnetic	2	2500	25	25Mbps	2.7 ~ 5.5	-40 ~ 105	8-SOIC CT	Active
IL 611-3E	NVE Corp	GMR	2	2500	15	100Mbps	3.0 ~ 5.5	-40 ~ 85	8-SOIC	Active
IL 611-3ETR7	NVE Corp	GMR	2	2500	15	100Mbps	3.0 ~ 5.5	-40 ~ 85	8-SOIC	Active
IL 711-3	NVE Corp	GMR	2	2500	100	110Mbps	3.0 ~ 5.5	-40 ~ 100	8-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ISO7221ADR is the primary equivalent, maintaining all electrical and thermal specifications of the discontinued ISO7221ADRG4. Both use capacitive coupling technology and operate identically across the full temperature and supply voltage range. The only difference is packaging format: ISO7221ADR is supplied in Cut Tape & Digi-Reel format instead of Tape & Reel. Both are ROHS3 compliant.

For Active Supply Chain with Enhanced Performance: ADUM1201ARZ and ADUM1201ARZ-RL7 provide identical electrical performance to ISO7221ADRG4 while offering active product status and higher inventory availability. These Analog Devices parts use magnetic coupling technology and extend the minimum supply voltage to 2.7V. Maximum operating temperature is 105°C versus 125°C for the original part. Both variants are ROHS3 compliant and available in Tube or Cut Tape & Digi-Reel packaging.

For Higher Data Rate Applications: ADUM1201BRZ and ADUM1201CRZ offer 10Mbps and 25Mbps data rates respectively, with improved propagation delay and pulse width distortion characteristics. These are suitable when the application can tolerate the reduced maximum operating temperature of 105°C.

For Maximum Common Mode Transient Immunity: IL 711-3 provides 100kV/µs CMTI, four times higher than the original ISO7221ADRG4. This part uses GMR technology and operates at 110Mbps. Maximum operating temperature is 100°C. Note that IL 711-3 has a different channel input configuration (2/0 versus 1/1).

For High-Speed Applications with GMR Technology: IL 611-3E and IL 611-3ETR7 operate at 100Mbps with 15kV/µs CMTI using GMR technology. Maximum operating temperature is 85°C. These parts are suitable for applications requiring higher data rates than the original 1Mbps specification.

Frequently Asked Questions (FAQ)

Q: Can ISO7221ADR be used as a direct drop-in replacement for ISO7221ADRG4? A: Yes. ISO7221ADR is electrically and functionally identical to ISO7221ADRG4. The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both operate at 1Mbps, 2500Vrms isolation, 25kV/µs CMTI, and -40°C to 125°C temperature range.

Q: What is the key difference between capacitive and magnetic coupling technologies in these isolators? A: Capacitive coupling (ISO7221 series) and magnetic coupling (ADUM1201 series) are different isolation technologies. Both achieve 2500Vrms isolation and meet the same safety standards. Magnetic coupling typically offers better propagation delay characteristics and lower power consumption in some applications. The choice depends on application-specific requirements such as EMI environment and power budget.

Q: Why do ADUM1201 parts have a lower maximum operating temperature (105°C vs. 125°C)? A: ADUM1201 parts are specified to 105°C maximum operating temperature due to the magnetic coupling technology platform used by Analog Devices. If the application requires operation above 105°C, ISO7221ADR or IL 711-3 must be used.

Q: Can I use IL 711-3 as a substitute if my application only requires 1Mbps data rate? A: Yes. IL 711-3 operates at 110Mbps, which exceeds the 1Mbps requirement. However, note that IL 711-3 has a different channel configuration (2 inputs on Side 1, 0 on Side 2) compared to ISO7221ADRG4 (1 input on each side). Verify that your circuit topology accommodates this channel arrangement before selection.

Q: What does the "-RL7" suffix mean in part numbers like ADUM1201ARZ-RL7? A: The "-RL7" suffix indicates the packaging format is Cut Tape & Digi-Reel. Parts without this suffix are supplied in Tube packaging. Both formats contain identical die and electrical specifications; the difference is only in how the parts are packaged and supplied.

Q: Are all substitute parts ROHS3 compliant? A: ISO7221ADR and all ADUM1201 variants are ROHS3 compliant. IL 611-3E and IL 611-3ETR7 are ROHS3 compliant. IL 711-3 is listed as RoHS non-compliant. Verify compliance requirements for your application before final selection.

Q: What is the significance of Common Mode Transient Immunity (CMTI) in isolator selection? A: CMTI specifies how quickly the isolator can respond to voltage changes on the isolated side without introducing errors. Higher CMTI values provide better noise immunity in high-speed switching environments. ISO7221ADRG4 specifies 25kV/µs; IL 711-3 provides 100kV/µs for applications with more severe transient conditions.

Q: Can I substitute a higher data rate part (like ADUM1201CRZ at 25Mbps) in a 1Mbps application? A: Yes. Higher data rate parts are backward compatible with lower data rate requirements. ADUM1201CRZ will function correctly in a 1Mbps application. However, verify that the reduced maximum operating temperature (105°C) and other specifications meet your system requirements.

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