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ISO7221CDG4 Equivalent & Substitute Parts
Part Overview
The ISO7221CDG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 2 channels, and 25Mbps data rate in an 8-SOIC package. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device uses capacitive coupling technology and operates across a supply voltage range of 2.8V to 5.5V with an operating temperature range of -40°C to 125°C.
Substiute Parts
Key Parameters
| Parameter | ISO7221CDG4 |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Isolation Voltage | 2500Vrms |
| Number of Channels | 2 |
| Channel Type | Unidirectional |
| Data Rate | 25Mbps |
| Common Mode Transient Immunity | 25kV/µs |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Supply Voltage | 2.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the ISO7221CDG4 is determined by the following critical parameters: isolation voltage (2500Vrms), number of channels (2), channel configuration (unidirectional 1/1), package type (8-SOIC), common mode transient immunity (25kV/µs minimum), and operating temperature range support (-40°C to 125°C).
The substitute parts are grouped into two categories:
Category 1: Texas Instruments ISO7221 Series (Capacitive Coupling) ISO7221CDR is the direct active equivalent from Texas Instruments, maintaining identical electrical specifications and technology platform. This part differs only in product status (active) and packaging format (Cut Tape & Digi-Reel).
Category 2: Analog Devices iCoupler Series (Magnetic Coupling) ADUM1201 and ADUM3201 series parts meet the core isolation, channel, and package requirements but operate at different data rates (1Mbps, 10Mbps, or 25Mbps variants). These parts use magnetic coupling technology instead of capacitive coupling. The ADUM3201 variants include automotive-grade qualification with extended temperature support to 125°C, while standard ADUM1201 variants support -40°C to 105°C.
Parameter Comparison
| Parameter | ISO7221CDG4 | ISO7221CDR | ADUM1201ARZ | ADUM1201ARZ-RL7 | ADUM1201BRZ | ADUM1201BRZ-RL7 | ADUM1201CRZ | ADUM1201CRZ-RL7 | ADUM3201WARZ | ADUM3201WARZ-RL7 | ADUM3201WBRZ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Technology | Capacitive Coupling | Capacitive Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling | Magnetic Coupling |
| Isolation Voltage | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Channel Type | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Data Rate | 25Mbps | 25Mbps | 1Mbps | 1Mbps | 10Mbps | 10Mbps | 25Mbps | 25Mbps | 1Mbps | 1Mbps | 10Mbps |
| Common Mode Transient Immunity | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 42ns / 42ns | 42ns / 42ns | 150ns / 150ns | 150ns / 150ns | 50ns / 50ns | 50ns / 50ns | 45ns / 45ns | 45ns / 45ns | 150ns / 150ns | 150ns / 150ns | 50ns / 50ns |
| Pulse Width Distortion (Max) | 2ns | 2ns | 40ns | 40ns | 3ns | 3ns | 3ns | 3ns | 40ns | 40ns | 3ns |
| Supply Voltage | 2.8V ~ 5.5V | 2.8V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 3V ~ 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 ~ 105°C | -40°C ~ 105°C | -40°C ~ 105°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: ISO7221CDR
ISO7221CDR is the direct active replacement for ISO7221CDG4. Both parts are manufactured by Texas Instruments, use identical capacitive coupling technology, and maintain all electrical specifications including 25Mbps data rate, 42ns propagation delay, and 2ns pulse width distortion. The only differences are product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. tube). This part is ROHS3 compliant and maintains full compatibility with existing designs.
Secondary Recommendation: ADUM1201CRZ or ADUM1201CRZ-RL7
For applications where magnetic coupling technology is acceptable, ADUM1201CRZ series provides 25Mbps data rate matching the original specification. These parts maintain 2500Vrms isolation, 2-channel unidirectional configuration, and 8-SOIC package. Propagation delay is 45ns (3ns longer than ISO7221CDG4) and pulse width distortion is 3ns (1ns higher). Operating temperature range is -40°C to 105°C, which is 20°C lower than the original part. Both parts are ROHS3 compliant and available in active status.
Tertiary Recommendation: ADUM3201WARZ or ADUM3201WARZ-RL7
For automotive applications requiring extended temperature support to 125°C, ADUM3201WARZ series provides automotive-grade qualification. These parts operate at 1Mbps data rate with 150ns propagation delay and 40ns pulse width distortion. Supply voltage range is 3V to 5.5V (higher minimum than ISO7221CDG4). Moisture sensitivity level is 3 (168 hours) compared to level 1 for the original part. These parts are ROHS3 compliant and available in active status.
Frequently Asked Questions (FAQ)
Q: Can ISO7221CDR be used as a direct drop-in replacement for ISO7221CDG4?
A: Yes. ISO7221CDR is electrically and functionally identical to ISO7221CDG4. Both parts share the same base product number (ISO7221), use capacitive coupling technology, and maintain identical electrical specifications. The primary difference is product status (active vs. obsolete) and packaging format. Pin configuration and package dimensions are identical (8-SOIC, 0.154", 3.90mm width).
Q: What are the key differences between capacitive coupling (ISO7221) and magnetic coupling (ADUM1201/ADUM3201) technologies?
A: Both technologies achieve 2500Vrms isolation and 25kV/µs common mode transient immunity. The ISO7221 uses capacitive coupling and achieves faster propagation delays (42ns) and lower pulse width distortion (2ns). The ADUM1201/ADUM3201 series use magnetic coupling with slower propagation delays (45-150ns depending on data rate variant) and higher pulse width distortion (3-40ns). Technology selection depends on timing-critical applications and power consumption requirements.
Q: Which ADUM1201 variant should I select if I need 25Mbps data rate?
A: ADUM1201CRZ or ADUM1201CRZ-RL7 are the 25Mbps variants. Both parts are available in active status with ROHS3 compliance. The difference is packaging: CRZ is tube packaging, while CRZ-RL7 is Cut Tape & Digi-Reel format. Electrical specifications are identical between these two variants.
Q: What is the temperature limitation when using ADUM1201 series instead of ISO7221CDG4?
A: Standard ADUM1201 series (ADUM1201ARZ, ADUM1201BRZ, ADUM1201CRZ) operate from -40°C to 105°C, which is 20°C lower than ISO7221CDG4 (-40°C to 125°C). If your application requires operation above 105°C, use ADUM3201 automotive-grade variants, which support -40°C to 125°C.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. ISO7221CDR, all ADUM1201 variants, and all ADUM3201 variants are ROHS3 compliant, matching the compliance status of ISO7221CDG4.
Q: What is the difference between ADUM3201WARZ and ADUM3201WARZ-RL7?
A: Both parts are electrically identical with 1Mbps data rate, 2500Vrms isolation, and automotive-grade qualification. The difference is packaging format: WARZ is tube packaging, while WARZ-RL7 is Tape & Reel format. Electrical specifications, temperature range (-40°C to 125°C), and supply voltage (3V to 5.5V) are identical.
Q: Can I use ADUM1201ARZ (1Mbps) in place of ISO7221CDG4 (25Mbps)?
A: ADUM1201ARZ meets the isolation voltage, channel count, and package requirements but operates at 1Mbps instead of 25Mbps. This substitution is only valid if your application's actual data rate requirement is 1Mbps or lower. Propagation delay is 150ns compared to 42ns for ISO7221CDG4, and pulse width distortion is 40ns compared to 2ns. Operating temperature is limited to -40°C to 105°C.
Q: What is the minimum supply voltage difference between ISO7221CDG4 and ADUM3201 variants?
A: ISO7221CDG4 operates from 2.8V minimum, while ADUM3201 variants require 3V minimum. This 0.2V difference may be significant in low-voltage applications. Verify your supply voltage specification before selecting ADUM3201 as a substitute.
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