Equivalent & Substitute Parts for ISO7221ADG4

Part Overview

The ISO7221ADG4 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 currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device uses capacitive coupling technology and operates across a supply voltage range of 3V to 5.5V with an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	ISO7221ADG4 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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ISO7221ADG4 is determined by the following critical parameters: isolation voltage (2500Vrms), number of channels (2), package type (8-SOIC), and functional compatibility. Substitute parts are grouped into two categories based on coupling technology and performance characteristics:

Category 1: Texas Instruments Capacitive Coupling Isolators

ISO7221AD (Tube packaging, Last Time Buy status)
ISO7221ADR (Cut Tape & Digi-Reel packaging, Active status)

These parts maintain identical electrical specifications and capacitive coupling technology, differing only in packaging format and product lifecycle status.

Category 2: Analog Devices iCoupler® Magnetic Coupling Isolators

ADUM1201ARZ, ADUM1201ARZ-RL7 (1Mbps data rate)
ADUM1201BRZ, ADUM1201BRZ-RL7 (10Mbps data rate)
ADUM1201CRZ, ADUM1201CRZ-RL7 (25Mbps data rate)

These parts share the same isolation voltage, channel count, and package, but use magnetic coupling technology. Data rate variants allow selection based on application requirements. Supply voltage range extends to 2.7V minimum.

Category 3: NVE Corp IsoLoop® GMR Isolators

IL 611-3E, IL 611-3ETR7 (100Mbps data rate)

These parts use Giant Magnetoresistive (GMR) technology with higher data rate capability (100Mbps) and faster propagation delay, but operate at a lower maximum operating temperature (-40°C to 85°C) and reduced CMTI (15kV/µs).

Parameter Comparison

Part Number	Manufacturer	Technology	Data Rate	Propagation Delay (Max)	CMTI (Min)	Supply Voltage	Operating Temp	Product Status	Packaging
ISO7221ADG4	Texas Instruments	Capacitive Coupling	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Obsolete	8-SOIC
ISO7221AD	Texas Instruments	Capacitive Coupling	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Last Time Buy	8-SOIC (Tube)
ISO7221ADR	Texas Instruments	Capacitive Coupling	1Mbps	475ns	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	Active	8-SOIC (CT & Digi-Reel)
ADUM1201ARZ	Analog Devices	Magnetic Coupling	1Mbps	150ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1201ARZ-RL7	Analog Devices	Magnetic Coupling	1Mbps	150ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT & Digi-Reel)
ADUM1201BRZ	Analog Devices	Magnetic Coupling	10Mbps	50ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1201BRZ-RL7	Analog Devices	Magnetic Coupling	10Mbps	50ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT & Digi-Reel)
ADUM1201CRZ	Analog Devices	Magnetic Coupling	25Mbps	45ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (Tube)
ADUM1201CRZ-RL7	Analog Devices	Magnetic Coupling	25Mbps	45ns	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	Active	8-SOIC (CT & Digi-Reel)
IL 611-3E	NVE Corp	GMR (Giant Magnetoresistive)	100Mbps	15ns	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC (Tube)
IL 611-3ETR7	NVE Corp	GMR (Giant Magnetoresistive)	100Mbps	15ns	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ISO7221ADR is the primary recommendation. It maintains all electrical and thermal specifications of the ISO7221ADG4 while offering active product status and superior availability (50,400 units in stock). The part is ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part.

For Extended Supply Voltage Range: ADUM1201ARZ or ADUM1201ARZ-RL7 provide identical 1Mbps data rate performance with extended minimum supply voltage (2.7V vs. 3V). These Analog Devices parts are active products with strong inventory levels. The magnetic coupling technology delivers faster propagation delay (150ns vs. 475ns), which may improve system timing margins. Operating temperature maximum is reduced to 105°C.

For Higher Data Rate Applications: ADUM1201BRZ-RL7 (10Mbps) or ADUM1201CRZ-RL7 (25Mbps) offer performance scaling while maintaining 2500Vrms isolation and 25kV/µs CMTI. These parts are suitable for applications requiring higher bandwidth than the original 1Mbps specification.

For Maximum Data Rate and Propagation Delay Performance: IL 611-3E or IL 611-3ETR7 deliver 100Mbps data rate with 15ns propagation delay. These parts are appropriate only for applications where the reduced CMTI (15kV/µs vs. 25kV/µs) and lower maximum operating temperature (-40°C to 85°C) are acceptable trade-offs.

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can ISO7221ADR directly replace ISO7221ADG4? A: Yes. ISO7221ADR is electrically and mechanically identical to ISO7221ADG4. The only differences are packaging format (Cut Tape & Digi-Reel vs. the original packaging) and product status (Active vs. Obsolete). Both use capacitive coupling technology and share identical electrical specifications including 1Mbps data rate, 475ns propagation delay, and 25kV/µs CMTI.

Q: What are the key differences between Texas Instruments and Analog Devices isolators? A: Texas Instruments ISO7221 series uses capacitive coupling technology, while Analog Devices ADUM1201 series uses magnetic coupling (iCoupler®). Both achieve 2500Vrms isolation and 25kV/µs CMTI at 1Mbps. The ADUM1201 series offers faster propagation delay (150ns vs. 475ns), extended supply voltage range (2.7V minimum), and higher data rate variants (10Mbps and 25Mbps). Operating temperature maximum is 105°C for ADUM1201 vs. 125°C for ISO7221.

Q: Is the NVE IL 611-3E suitable as a substitute? A: IL 611-3E is mechanically compatible (8-SOIC package) and maintains 2500Vrms isolation. However, it differs in three critical parameters: CMTI is reduced to 15kV/µs (vs. 25kV/µs), maximum operating temperature is 85°C (vs. 125°C), and data rate is 100Mbps (vs. 1Mbps). Use IL 611-3E only if your application requires 100Mbps data rate and can tolerate the reduced CMTI and lower temperature rating.

Q: What is the difference between tube and Cut Tape & Digi-Reel packaging? A: Both packaging formats contain identical parts in the same 8-SOIC case. Tube packaging is used for lower-volume orders, while Cut Tape & Digi-Reel packaging is standard for high-volume production. Selection depends on procurement volume and assembly line requirements, not electrical performance.

Q: Can I use ADUM1201BRZ or ADUM1201CRZ if my application only requires 1Mbps? A: Yes. ADUM1201BRZ (10Mbps) and ADUM1201CRZ (25Mbps) are backward compatible with 1Mbps applications. These higher-speed variants offer improved propagation delay performance (50ns and 45ns respectively vs. 475ns for ISO7221ADG4) and may provide timing margin benefits. All three ADUM1201 variants maintain identical isolation voltage, channel count, and CMTI specifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of ISO7221ADG4.

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