ISO7221CD Equivalent & Substitute Parts

Part Overview

The ISO7221CD is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage and 2-channel unidirectional architecture in an 8-SOIC package. This device utilizes capacitive coupling technology and operates at 25Mbps data rate with 25kV/µs common mode transient immunity. The ISO7221CD is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	ISO7221CD
Package Type	8-SOIC (0.154", 3.90mm Width)
Isolation Voltage	2500Vrms
Number of Channels	2
Channel Configuration	Unidirectional (1/1)
Data Rate	25Mbps
Common Mode Transient Immunity	25kV/µs
Technology	Capacitive Coupling
Supply Voltage Range	2.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7221CD is determined by strict alignment across the following critical parameters:

Mandatory Matching Parameters:

Isolation voltage: 2500Vrms
Number of channels: 2
Channel configuration: Unidirectional (1/1)
Package type: 8-SOIC (0.154", 3.90mm Width)
Common mode transient immunity: 25kV/µs minimum
Mounting type: Surface Mount

Performance Tier Grouping: Substitute parts are grouped by data rate capability, as this parameter directly affects application suitability while maintaining electrical compatibility:

25Mbps tier: ISO7221CDR (Texas Instruments), ADUM1201CRZ, ADUM1201CRZ-RL7 (Analog Devices)
10Mbps tier: ADUM1201BRZ, ADUM1201BRZ-RL7 (Analog Devices)
1Mbps tier: ADUM1201ARZ, ADUM1201ARZ-RL7, ADUM3201WARZ, ADUM3201WARZ-RL7 (Analog Devices)

All listed substitutes maintain identical isolation voltage, channel count, package footprint, and CMTI specifications. Technology differences (capacitive vs. magnetic coupling) and propagation delay variations are secondary considerations that do not prevent functional substitution within the specified electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Technology	Data Rate	Propagation Delay (Max)	Pulse Width Distortion (Max)	Supply Voltage	Operating Temp	Product Status	Packaging
ISO7221CD	Texas Instruments	Capacitive Coupling	25Mbps	42ns	2ns	2.8V ~ 5.5V	-40°C ~ 125°C	Last Time Buy	Tube
ISO7221CDR	Texas Instruments	Capacitive Coupling	25Mbps	42ns	2ns	2.8V ~ 5.5V	-40°C ~ 125°C	Active	Cut Tape & Digi-Reel
ADUM1201ARZ	Analog Devices	Magnetic Coupling	1Mbps	150ns	40ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Tube
ADUM1201ARZ-RL7	Analog Devices	Magnetic Coupling	1Mbps	150ns	40ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Cut Tape & Digi-Reel
ADUM1201BRZ	Analog Devices	Magnetic Coupling	10Mbps	50ns	3ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Tube
ADUM1201BRZ-RL7	Analog Devices	Magnetic Coupling	10Mbps	50ns	3ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Cut Tape & Digi-Reel
ADUM1201CRZ	Analog Devices	Magnetic Coupling	25Mbps	45ns	3ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Tube
ADUM1201CRZ-RL7	Analog Devices	Magnetic Coupling	25Mbps	45ns	3ns	2.7V ~ 5.5V	-40°C ~ 105°C	Active	Cut Tape & Digi-Reel
ADUM3201WARZ	Analog Devices	Magnetic Coupling	1Mbps	150ns	40ns	3V ~ 5.5V	-40°C ~ 125°C	Active	Tube
ADUM3201WARZ-RL7	Analog Devices	Magnetic Coupling	1Mbps	150ns	40ns	3V ~ 5.5V	-40°C ~ 125°C	Active	Tape & Reel
ADUM3201WBRZ	Analog Devices	Magnetic Coupling	10Mbps	50ns	3ns	3V ~ 5.5V	-40°C ~ 125°C	Active	Tube

Engineering Selection Recommendations

Primary Recommendation: ISO7221CDR

ISO7221CDR is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications, package footprint, and performance characteristics as the ISO7221CD. The only difference is product status (Active vs. Last Time Buy) and packaging format (Cut Tape & Digi-Reel vs. Tube). This part is ROHS3 compliant and carries the same compliance certifications. Selection of ISO7221CDR eliminates any technical substitution considerations and provides continuity with the original design.

Secondary Recommendation: ADUM1201CRZ or ADUM1201CRZ-RL7

For applications requiring an alternative manufacturer source, the ADUM1201CRZ series from Analog Devices provides matching 25Mbps data rate performance. These parts maintain 2500Vrms isolation, 2-channel unidirectional configuration, and 8-SOIC package compatibility. Operating temperature range is reduced to -40°C ~ 105°C compared to the ISO7221CD's -40°C ~ 125°C. Propagation delay is marginally improved (45ns vs. 42ns), and pulse width distortion is slightly higher (3ns vs. 2ns). Both ROHS3 compliant. The ADUM1201CRZ-RL7 variant offers Cut Tape & Digi-Reel packaging for high-volume procurement.

Lower Data Rate Alternatives

ADUM1201ARZ/ARZ-RL7 (1Mbps) and ADUM1201BRZ/BRZ-RL7 (10Mbps) are functionally compatible substitutes for applications not requiring 25Mbps performance. These parts reduce propagation delay and pulse width distortion specifications but operate at lower data rates. Operating temperature is limited to -40°C ~ 105°C.

Automotive Grade Option

ADUM3201WARZ and ADUM3201WBRZ are automotive-grade variants with extended operating temperature to -40°C ~ 125°C, matching the ISO7221CD temperature range. These parts carry automotive qualification and MSL 3 moisture sensitivity rating. Available in 1Mbps and 10Mbps data rate configurations.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ISO7221CD with ISO7221CDR?

A: Yes. ISO7221CDR is the active production equivalent. Both parts share identical electrical specifications, isolation voltage, channel configuration, and package footprint. The only differences are product lifecycle status and packaging format (tube vs. cut tape/digi-reel). No circuit modifications are required.

Q: What are the key differences between Texas Instruments ISO7221 and Analog Devices ADUM1201 series?

A: Both maintain 2500Vrms isolation, 2-channel unidirectional architecture, and 8-SOIC packaging. Primary differences are coupling technology (capacitive vs. magnetic), data rate options, and operating temperature range. ADUM1201 series offers multiple data rate grades (1Mbps, 10Mbps, 25Mbps) while ISO7221CD operates at fixed 25Mbps. ISO7221CD supports -40°C ~ 125°C; ADUM1201 standard grades support -40°C ~ 105°C.

Q: Can I use a 1Mbps or 10Mbps substitute if my application only requires lower data rates?

A: Yes. ADUM1201ARZ (1Mbps) and ADUM1201BRZ (10Mbps) are electrically compatible substitutes for applications with lower bandwidth requirements. All maintain the same isolation voltage, channel count, and package footprint. Propagation delay and pulse width distortion specifications differ but do not prevent functional substitution in lower-speed applications.

Q: What is the difference between tube and cut tape packaging?

A: Tube packaging (standard) is suitable for lower-volume orders and manual assembly. Cut Tape & Digi-Reel packaging is optimized for high-volume automated pick-and-place assembly. Both contain identical components; packaging format affects procurement and assembly workflow only.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All parts listed—ISO7221CDR, ADUM1201 series, and ADUM3201 series—are ROHS3 compliant and REACH unaffected. Compliance certifications are consistent across all substitutes.

Q: What is the operating temperature limitation when switching to ADUM1201 series?

A: Standard ADUM1201 parts (ADUM1201ARZ, ADUM1201BRZ, ADUM1201CRZ) operate from -40°C ~ 105°C, compared to ISO7221CD's -40°C ~ 125°C. If your application requires operation above 105°C, use ADUM3201WARZ or ADUM3201WBRZ automotive-grade variants, which support -40°C ~ 125°C.

Q: Can I mix different data rate grades in the same design?

A: Yes, provided your circuit topology and signal timing accommodate the different propagation delays. ADUM1201ARZ (150ns max delay) differs significantly from ADUM1201CRZ (45ns max delay). Verify timing margins in your specific application before mixing grades.

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