ISO7420DR Digital Isolator 2500Vrms 2-Channel Equivalent & Substitute Parts

Part Overview

The ISO7420DR is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 2-channel unidirectional configuration, and 1Mbps data rate in an 8-SOIC package. The device utilizes capacitive coupling technology and operates across -40°C to 105°C. This part is currently active in production with 5816 units in stock.

Equivalent and substitute parts are necessary when the ISO7420DR becomes unavailable, when alternative packaging formats are required, or when application requirements demand enhanced performance specifications such as higher data rates or improved propagation delay characteristics.

Key Parameters

Parameter	ISO7420DR Specification
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Isolation Voltage	2500Vrms
Number of Channels	2
Channel Configuration	2 Input / 0 Output (Unidirectional)
Data Rate	1Mbps
Common Mode Transient Immunity (Min)	25kV/µs
Propagation Delay tpLH / tpHL (Max)	14ns / 14ns
Pulse Width Distortion (Max)	3.7ns
Supply Voltage Range	3.15V–3.45V, 4.75V–5.25V
Operating Temperature	-40°C to 105°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ISO7420DR are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Isolation voltage: 2500Vrms minimum
Package type: 8-SOIC (0.154", 3.90mm Width)
Channel configuration: 2-channel unidirectional
Common mode transient immunity: 25kV/µs minimum
Operating temperature range: -40°C to 105°C minimum
Surface mount technology
RoHS3 compliance

Substitution Categories:

Category A – Direct Functional Equivalents (1Mbps Data Rate): ADUM1200ARZ and ADUM1200ARZ-RL7 (Analog Devices iCoupler series) provide equivalent 1Mbps performance with magnetic coupling technology. These parts maintain identical channel configuration, isolation voltage, and CMTI specifications. The primary difference is packaging format (Tube vs. Cut Tape & Digi-Reel).

Category B – Enhanced Performance Substitutes (10Mbps Data Rate): ADUM1200BRZ and ADUM1200BRZ-RL7 offer 10x higher data rate (10Mbps) with improved propagation delay (50ns vs. 14ns) and reduced pulse width distortion (3ns vs. 3.7ns). These maintain all core isolation and channel specifications.

Category C – High-Speed Substitutes (25Mbps Data Rate): ADUM1200CRZ and ADUM1200CRZ-RL7 provide 25Mbps data rate with 45ns propagation delay and 3ns pulse width distortion, suitable for applications requiring higher bandwidth.

Category D – High-Performance Alternatives (150Mbps Data Rate): SI8620BB-B-ISR and SI8620EC-B-ISR (Skyworks Solutions) deliver 150Mbps data rate with 13ns propagation delay and 35kV/µs CMTI. SI8620EC-B-ISR features enhanced 3750Vrms isolation voltage.

Category E – Legacy Compatibility: SI8421AB-C-IS (Skyworks Solutions) provides 1Mbps performance with capacitive coupling technology matching the ISO7420DR. This part is marked "Not For New Designs" and carries extended operating temperature range (-40°C to 125°C).

Parameter Comparison

Part Number	Manufacturer	Technology	Isolation Voltage	Data Rate	Propagation Delay (Max)	CMTI (Min)	PWD (Max)	Supply Voltage	Temp Range	Packaging	Product Status
ISO7420DR	Texas Instruments	Capacitive	2500Vrms	1Mbps	14ns	25kV/µs	3.7ns	3.15–3.45V, 4.75–5.25V	-40 to 105°C	Cut Tape & Digi-Reel	Active
ADUM1200ARZ	Analog Devices	Magnetic	2500Vrms	1Mbps	150ns	25kV/µs	40ns	2.7–5.5V	-40 to 105°C	Tube	Active
ADUM1200ARZ-RL7	Analog Devices	Magnetic	2500Vrms	1Mbps	150ns	25kV/µs	40ns	2.7–5.5V	-40 to 105°C	Cut Tape & Digi-Reel	Active
ADUM1200BRZ	Analog Devices	Magnetic	2500Vrms	10Mbps	50ns	25kV/µs	3ns	2.7–5.5V	-40 to 105°C	Tube	Active
ADUM1200BRZ-RL7	Analog Devices	Magnetic	2500Vrms	10Mbps	50ns	25kV/µs	3ns	2.7–5.5V	-40 to 105°C	Cut Tape & Digi-Reel	Active
ADUM1200CRZ	Analog Devices	Magnetic	2500Vrms	25Mbps	45ns	25kV/µs	3ns	2.7–5.5V	-40 to 105°C	Tube	Active
ADUM1200CRZ-RL7	Analog Devices	Magnetic	2500Vrms	25Mbps	45ns	25kV/µs	3ns	2.7–5.5V	-40 to 105°C	Cut Tape & Digi-Reel	Active
SI8421AB-C-IS	Skyworks Solutions	Capacitive	2500Vrms	1Mbps	35ns	25kV/µs (Typ)	25ns	2.7–5.5V	-40 to 125°C	Tube	Not For New Designs
SI8620BB-B-ISR	Skyworks Solutions	Capacitive	2500Vrms	150Mbps	13ns	35kV/µs	4.5ns	2.5–5.5V	-40 to 125°C	Tape & Reel	Active
SI8620EC-B-ISR	Skyworks Solutions	Capacitive	3750Vrms	150Mbps	13ns	35kV/µs	4.5ns	2.5–5.5V	-40 to 125°C	Cut Tape & Digi-Reel	Active

Engineering Selection Recommendations

For Direct Replacement (1Mbps Applications): ADUM1200ARZ-RL7 is the primary substitute when Cut Tape & Digi-Reel packaging is required. This part maintains identical data rate, isolation voltage, and CMTI specifications. The wider supply voltage range (2.7–5.5V vs. 3.15–3.45V, 4.75–5.25V) provides enhanced flexibility. Magnetic coupling technology differs from the ISO7420DR's capacitive approach but delivers equivalent functional performance for 1Mbps operation.

For Tube Packaging: ADUM1200ARZ provides the same electrical specifications as ADUM1200ARZ-RL7 in Tube format when reel packaging is not required.

For Enhanced Performance Requirements: ADUM1200BRZ-RL7 or ADUM1200CRZ-RL7 are suitable when higher data rates (10Mbps or 25Mbps respectively) are acceptable and provide improved propagation delay characteristics. Both maintain 2500Vrms isolation and 25kV/µs CMTI.

For High-Speed Applications (150Mbps): SI8620EC-B-ISR offers the fastest data rate with 13ns propagation delay and enhanced 3750Vrms isolation voltage. This part is available in Cut Tape & Digi-Reel format and extends operating temperature to 125°C. SI8620BB-B-ISR provides identical performance with standard 2500Vrms isolation in Tape & Reel packaging.

For Legacy System Compatibility: SI8421AB-C-IS maintains capacitive coupling technology matching the ISO7420DR but is designated "Not For New Designs." This part is suitable only for sustaining existing production or repair applications.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels vary: ISO7420DR and all Analog Devices ADUM1200 variants carry MSL 1 (Unlimited), while Skyworks SI8420 and SI8620 series carry MSL 2A (4 Weeks).

Frequently Asked Questions (FAQ)

Q: Can ADUM1200ARZ-RL7 directly replace ISO7420DR in existing designs? A: Yes, for applications operating at 1Mbps or lower. The part maintains 2500Vrms isolation, 2-channel unidirectional configuration, 25kV/µs CMTI, and 8-SOIC package. The wider supply voltage range (2.7–5.5V) is compatible with designs using the ISO7420DR's specified ranges. Propagation delay increases from 14ns to 150ns; verify timing-critical applications can tolerate this difference.

Q: What is the primary difference between Analog Devices ADUM1200 variants? A: The suffix letter designates data rate: A-series = 1Mbps, B-series = 10Mbps, C-series = 25Mbps. All variants share identical isolation voltage (2500Vrms), channel configuration, and CMTI specifications. Higher data rate variants exhibit improved propagation delay and pulse width distortion.

Q: Why does SI8620EC-B-ISR have 3750Vrms isolation instead of 2500Vrms? A: SI8620EC-B-ISR is a higher-specification variant within the SI8620 family. The enhanced isolation voltage provides additional safety margin in high-voltage isolation applications. This part is a superset replacement suitable for any application requiring 2500Vrms or higher isolation.

Q: What packaging formats are available for each substitute? A: Analog Devices ADUM1200 series offers both Tube and Cut Tape & Digi-Reel formats (designated by -RL7 suffix for reel packaging). Skyworks SI8620 series is available in Tape & Reel (SI8620BB-B-ISR) and Cut Tape & Digi-Reel (SI8620EC-B-ISR). SI8421AB-C-IS is available in Tube format only.

Q: Are there supply voltage compatibility concerns when substituting? A: ISO7420DR operates on dual supply ranges (3.15–3.45V and 4.75–5.25V). ADUM1200 series accepts continuous 2.7–5.5V operation, which encompasses both ISO7420DR ranges. SI8620 series operates 2.5–5.5V. Verify the specific supply voltage configuration in your application; all substitutes are compatible with standard 3.3V and 5V logic supplies.

Q: What is the moisture sensitivity impact when substituting? A: ISO7420DR and ADUM1200 series carry MSL 1 (Unlimited), requiring no special moisture handling. Skyworks SI8420 and SI8620 series carry MSL 2A (4 Weeks), requiring dry storage and baking procedures per IPC-A-610 standards if exposed to ambient humidity. Verify your manufacturing process accommodates this requirement.

Q: Can SI8421AB-C-IS be used in new designs? A: SI8421AB-C-IS is marked "Not For New Designs" by the manufacturer. This designation indicates the part is in mature/legacy status. Use this part only for sustaining production of existing products or repair applications. For new designs, select ADUM1200ARZ-RL7 or SI8620 series alternatives.

Q: How do propagation delay differences affect circuit timing? A: ISO7420DR specifies 14ns maximum propagation delay. ADUM1200ARZ increases this to 150ns, while ADUM1200BRZ reduces it to 50ns and ADUM1200CRZ to 45ns. SI8620 series achieves 13ns. For timing-critical applications, calculate the total propagation delay budget including the isolator and verify the substitute meets system requirements.

Q: Are all substitutes pin-compatible with ISO7420DR? A: All substitutes use the 8-SOIC (0.154", 3.90mm Width) package. Verify pinout compatibility in the respective datasheets before PCB layout changes. While package dimensions are identical, internal pin assignments may differ between manufacturers.

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