ISO7221AD Digital Isolator 2500Vrms 2-Channel Equivalent & Substitute Parts

Part Overview

The ISO7221AD 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 ISO7221AD is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement planning. Active alternatives from Analog Devices and NVE provide extended availability with enhanced performance characteristics.

Key Parameters

Parameter	ISO7221AD
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Isolation Voltage	2500Vrms
Number of Channels	2
Channel Configuration	1/1 (Unidirectional)
Data Rate	1Mbps
Common Mode Transient Immunity	25kV/µs
Supply Voltage Range	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7221AD is determined by strict alignment with the following core parameters: 2500Vrms isolation voltage, 2-channel configuration, 8-SOIC package form factor, unidirectional channel type, and surface mount mounting. All substitute parts maintain these baseline electrical and mechanical specifications.

Substitute parts are grouped into three technology categories based on isolation coupling method:

Capacitive Coupling (Direct Technology Match): ISO7221ADR maintains identical technology, electrical performance, and specifications as the ISO7221AD, differing only in packaging format (Cut Tape & Digi-Reel versus Tube).

Magnetic Coupling (iCoupler® Series): ADUM1201ARZ, ADUM1201ARZ-RL7, ADUM1201BRZ, ADUM1201BRZ-RL7, ADUM1201CRZ, and ADUM1201CRZ-RL7 employ magnetic coupling technology while maintaining 2500Vrms isolation, 2-channel configuration, and 8-SOIC packaging. These variants offer enhanced data rate options (1Mbps, 10Mbps, 25Mbps) with improved propagation delay characteristics and extended supply voltage range (2.7V ~ 5.5V). Operating temperature range is -40°C ~ 105°C.

GMR Technology (IsoLoop® Series): IL 611-3E and IL 611-3ETR7 utilize Giant Magnetoresistive (GMR) technology, delivering 100Mbps data rate with 15kV/µs common mode transient immunity. Operating temperature is limited to -40°C ~ 85°C. Channel configuration differs with 2/0 input-output split versus the 1/1 configuration of the main part.

Parameter Comparison

Part Number	Manufacturer	Technology	Isolation Voltage	Channels	Data Rate	CMTI (Min)	Supply Voltage	Temp Range	Package	Product Status
ISO7221AD	Texas Instruments	Capacitive	2500Vrms	2	1Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Last Time Buy
ISO7221ADR	Texas Instruments	Capacitive	2500Vrms	2	1Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
ADUM1201ARZ	Analog Devices	Magnetic	2500Vrms	2	1Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
ADUM1201ARZ-RL7	Analog Devices	Magnetic	2500Vrms	2	1Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
ADUM1201BRZ	Analog Devices	Magnetic	2500Vrms	2	10Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
ADUM1201BRZ-RL7	Analog Devices	Magnetic	2500Vrms	2	10Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
ADUM1201CRZ	Analog Devices	Magnetic	2500Vrms	2	25Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
ADUM1201CRZ-RL7	Analog Devices	Magnetic	2500Vrms	2	25Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active
IL 611-3E	NVE Corp	GMR	2500Vrms	2	100Mbps	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
IL 611-3ETR7	NVE Corp	GMR	2500Vrms	2	100Mbps	15kV/µs	3V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): ISO7221ADR is the primary substitute for ISO7221AD. Both devices employ capacitive coupling technology with matching electrical performance, isolation voltage, data rate, and operating temperature range. ISO7221ADR is in Active product status with significantly higher inventory availability (50,400 units) compared to the Last Time Buy ISO7221AD. The only difference is packaging format: ISO7221ADR is supplied in Cut Tape & Digi-Reel format while ISO7221AD is supplied in Tube format.

Performance-Enhanced Alternatives (Magnetic Coupling): The ADUM1201 series from Analog Devices provides magnetic coupling technology with identical 2500Vrms isolation and 2-channel configuration. ADUM1201ARZ and ADUM1201ARZ-RL7 maintain 1Mbps data rate matching the ISO7221AD while offering extended supply voltage range (2.7V minimum versus 3V minimum). ADUM1201BRZ and ADUM1201BRZ-RL7 provide 10Mbps data rate capability. ADUM1201CRZ and ADUM1201CRZ-RL7 deliver 25Mbps data rate. All ADUM1201 variants are in Active status with robust inventory levels. Operating temperature maximum is 105°C versus 125°C for the ISO7221AD.

High-Speed Alternative (GMR Technology): IL 611-3E and IL 611-3ETR7 from NVE Corp utilize GMR technology, delivering 100Mbps data rate with 15kV/µs common mode transient immunity. These devices maintain 2500Vrms isolation and 8-SOIC packaging. Operating temperature range is -40°C ~ 85°C, which is more restrictive than the ISO7221AD. Channel configuration is 2/0 (two inputs, zero outputs) versus the 1/1 configuration of the main part, requiring circuit topology verification before selection.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Selection should be based on application requirements for data rate, operating temperature range, supply voltage constraints, and channel configuration compatibility.

Frequently Asked Questions (FAQ)

Q: Can ISO7221ADR be used as a direct drop-in replacement for ISO7221AD?

A: Yes. ISO7221ADR is electrically and functionally identical to ISO7221AD. Both employ capacitive coupling technology with 2500Vrms isolation, 1Mbps data rate, 25kV/µs CMTI, and 8-SOIC packaging. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). Pin configuration and electrical specifications are identical, allowing direct substitution in existing designs.

Q: What are the key differences between capacitive coupling (ISO7221AD) and magnetic coupling (ADUM1201 series)?

A: Capacitive coupling and magnetic coupling are different isolation technologies. ISO7221AD uses capacitive coupling with 1Mbps data rate and 475ns maximum propagation delay. ADUM1201 series uses magnetic coupling with data rate options of 1Mbps, 10Mbps, or 25Mbps, and significantly faster propagation delays (150ns for ADUM1201ARZ, 50ns for ADUM1201BRZ, 45ns for ADUM1201CRZ). Both technologies maintain 2500Vrms isolation and 8-SOIC packaging. Selection depends on application bandwidth requirements and propagation delay constraints.

Q: Can I use IL 611-3E as a substitute for ISO7221AD?

A: IL 611-3E maintains 2500Vrms isolation and 8-SOIC packaging but differs in channel configuration (2/0 versus 1/1), data rate (100Mbps versus 1Mbps), and operating temperature maximum (85°C versus 125°C). Substitution requires verification that the application can accommodate the 2/0 channel configuration and does not require operation above 85°C. The higher data rate capability of IL 611-3E is not a limitation for 1Mbps applications.

Q: What is the difference between ADUM1201ARZ and ADUM1201ARZ-RL7?

A: ADUM1201ARZ and ADUM1201ARZ-RL7 are electrically identical. The difference is packaging format: ADUM1201ARZ is supplied in Tube format while ADUM1201ARZ-RL7 is supplied in Cut Tape & Digi-Reel format. Both maintain identical electrical specifications, isolation voltage, data rate, and operating characteristics.

Q: Does the extended supply voltage range of ADUM1201 (2.7V minimum) versus ISO7221AD (3V minimum) affect compatibility?

A: The extended supply voltage range of ADUM1201 (2.7V ~ 5.5V) is a superset of ISO7221AD (3V ~ 5.5V). If your application operates at 3V or higher, both devices are compatible. If your application requires operation below 3V, ADUM1201 provides additional flexibility. This difference does not prevent substitution in designs operating within the ISO7221AD supply range.

Q: Why is the operating temperature range of ADUM1201 limited to 105°C while ISO7221AD operates to 125°C?

A: ADUM1201 series is specified for -40°C ~ 105°C operating temperature, while ISO7221AD is specified for -40°C ~ 125°C. If your application requires operation above 105°C, ADUM1201 is not suitable. For applications operating within -40°C ~ 105°C, ADUM1201 is fully compatible. Temperature range selection should be based on actual application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (ISO7221ADR, ADUM1201 series, and IL 611 series) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of ISO7221AD.

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