ISO7420MDR Digital Isolator 2500Vrms 2-Channel Equivalent & Substitute Parts

Part Overview

The ISO7420MDR 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 capacitive coupling isolator operates at 1Mbps data rate with 25kV/µs common mode transient immunity and is actively produced. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and isolation specifications to support design flexibility and supply chain alternatives.

Key Parameters

Parameter	ISO7420MDR
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Isolation Voltage	2500Vrms
Number of Channels	2
Channel Configuration	2/0 (Unidirectional)
Data Rate	1Mbps
Common Mode Transient Immunity	25kV/µs
Package	8-SOIC (0.154", 3.90mm Width)
Supply Voltage	3.15V–3.45V, 4.75V–5.25V
Operating Temperature	-40°C to 125°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Matching Criteria:

Isolation voltage: 2500Vrms minimum
Package type: 8-SOIC (0.154", 3.90mm Width)
Number of channels: 2
Channel configuration: Unidirectional (2/0 input/output)
Common mode transient immunity: 25kV/µs minimum
Data rate: 1Mbps minimum
Operating temperature range: Must support -40°C to 125°C or equivalent industrial range

Substitution Groups:

Group 1: Magnetic Coupling Isolators (Analog Devices iCoupler® Series) ADUM1200ARZ, ADUM1200ARZ-RL7, ADUM1200BRZ, ADUM1200BRZ-RL7, ADUM1200CRZ, ADUM1200CRZ-RL7 meet core isolation and package requirements with magnetic coupling technology. These parts support wider supply voltage ranges (2.7V–5.5V) and higher data rates (1Mbps to 25Mbps). Operating temperature maximum is -40°C to 105°C, which is 20°C lower than the main part.

Group 2: GMR Isolators (NVE IsoLoop® Series) IL 711-3E, IL 711-3, IL 711T-3, IL 712-3 employ giant magnetoresistive (GMR) technology with 100kV/µs common mode transient immunity, exceeding the main part specification. Data rates reach 110Mbps. IL 712-3 features 1/1 channel configuration (bidirectional), differing from the 2/0 unidirectional requirement. IL 711T-3 supports -40°C to 125°C operating range matching the main part.

Parameter Comparison

Part Number	Manufacturer	Technology	Isolation (Vrms)	Data Rate	CMTI (kV/µs)	Temp Range (°C)	Supply (V)	RoHS Status
ISO7420MDR	Texas Instruments	Capacitive	2500	1Mbps	25	-40 to 125	3.15–3.45, 4.75–5.25	ROHS3
ADUM1200ARZ	Analog Devices	Magnetic	2500	1Mbps	25	-40 to 105	2.7–5.5	ROHS3
ADUM1200ARZ-RL7	Analog Devices	Magnetic	2500	1Mbps	25	-40 to 105	2.7–5.5	ROHS3
ADUM1200BRZ	Analog Devices	Magnetic	2500	10Mbps	25	-40 to 105	2.7–5.5	ROHS3
ADUM1200BRZ-RL7	Analog Devices	Magnetic	2500	10Mbps	25	-40 to 105	2.7–5.5	ROHS3
ADUM1200CRZ	Analog Devices	Magnetic	2500	25Mbps	25	-40 to 105	2.7–5.5	ROHS3
ADUM1200CRZ-RL7	Analog Devices	Magnetic	2500	25Mbps	25	-40 to 105	2.7–5.5	ROHS3
IL 711-3E	NVE Corp	GMR	2500	110Mbps	100	-40 to 100	3–5.5	ROHS3
IL 711-3	NVE Corp	GMR	2500	110Mbps	100	-40 to 100	3–5.5	Non-compliant
IL 711T-3	NVE Corp	GMR	2500	110Mbps	100	-40 to 125	3–5.5	Non-compliant
IL 712-3	NVE Corp	GMR	2500	110Mbps	100	-40 to 100	3–5.5	Non-compliant

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: ADUM1200ARZ, ADUM1200ARZ-RL7, ADUM1200BRZ, ADUM1200BRZ-RL7, ADUM1200CRZ, ADUM1200CRZ-RL7, and IL 711-3E are ROHS3 compliant. The ISO7420MDR and these parts meet current environmental compliance standards.

For Extended Temperature Operation (-40°C to 125°C): ISO7420MDR and IL 711T-3 support the full -40°C to 125°C range. Analog Devices ADUM1200 series parts operate to -40°C to 105°C maximum, limiting use in applications requiring 125°C operation.

For Active Product Status: All listed substitute parts maintain active product status, ensuring continued availability and manufacturer support.

For Supply Voltage Flexibility: Analog Devices ADUM1200 series accepts 2.7V–5.5V supply, providing broader input voltage tolerance compared to ISO7420MDR dual-range specification (3.15–3.45V, 4.75–5.25V). NVE IsoLoop parts operate 3V–5.5V.

For Packaging Variants: ADUM1200ARZ-RL7, ADUM1200BRZ-RL7, and ADUM1200CRZ-RL7 are supplied in Cut Tape (CT) & Digi-Reel® format, while base ADUM1200 variants use Tube packaging. All maintain 8-SOIC package footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can ADUM1200 series parts directly replace ISO7420MDR in all applications? A: ADUM1200 parts meet isolation voltage, channel count, package, and CMTI specifications. However, maximum operating temperature is 105°C versus 125°C for ISO7420MDR. Applications requiring sustained 125°C operation require IL 711T-3 or continued use of ISO7420MDR.

Q: What is the difference between ADUM1200ARZ and ADUM1200ARZ-RL7? A: Both parts are electrically identical. ADUM1200ARZ-RL7 uses Cut Tape (CT) & Digi-Reel® packaging for automated assembly, while ADUM1200ARZ uses Tube packaging. Select based on assembly process requirements.

Q: Why do IL 712-3 and IL 711-3 have different channel configurations? A: IL 712-3 features 1/1 channel configuration (one input, one output per side), while IL 711-3 and IL 711-3E feature 2/0 configuration (two inputs, zero outputs), matching ISO7420MDR. Channel configuration determines signal routing capability and must align with circuit design requirements.

Q: Are NVE IsoLoop parts suitable for new designs? A: IL 711-3E is ROHS3 compliant and actively produced. IL 711-3 and IL 712-3 are RoHS non-compliant and suitable only for legacy or non-regulated applications. IL 711T-3 is non-compliant but supports extended temperature range.

Q: What is the significance of 100kV/µs CMTI in NVE parts versus 25kV/µs in ISO7420MDR? A: Higher CMTI rating indicates superior immunity to rapid voltage transitions on the isolation barrier. NVE IsoLoop parts provide 4× greater transient immunity, beneficial for high-noise industrial environments but not required for ISO7420MDR-specified applications.

Q: Can these parts be used interchangeably in PCB layouts? A: All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) package with matching pin assignments for 2-channel unidirectional isolators. PCB footprints are compatible. Verify pinout documentation for specific part selection to confirm signal routing alignment.

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