ISO7220MD Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7220MD 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 and supports data rates up to 150Mbps with 25kV/µs common mode transient immunity.

The ISO7220MD is designated as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts is necessary to ensure design continuity and long-term supply chain reliability for applications requiring 2500Vrms isolation with comparable electrical performance.

Key Parameters

Parameter	ISO7220MD Value
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Number of Channels	2
Voltage - Isolation	2500Vrms
Data Rate	150Mbps
Common Mode Transient Immunity (Min)	25kV/µs
Propagation Delay tpLH / tpHL (Max)	16ns / 16ns
Voltage - Supply	3V ~ 5.5V
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7220MD is determined by the following critical parameters:

Primary Substitution Criteria:

Isolation voltage: 2500Vrms (exact match required)
Number of channels: 2 (exact match required)
Package type: 8-SOIC (exact match required)
Channel configuration: Unidirectional, 2 inputs on Side 1, 0 on Side 2

Secondary Compatibility Factors:

Data rate: 150Mbps or higher
Common mode transient immunity: 25kV/µs or higher
Supply voltage range: Must encompass 3V ~ 5.5V
Operating temperature: Must support -40°C ~ 125°C or equivalent industrial range

Substitutes are grouped into two categories:

Category 1: Direct Equivalents (Same Manufacturer - Texas Instruments)

ISO7220MDR: Identical electrical specifications, alternative packaging (Cut Tape & Digi-Reel)
ISO721MD: Parametric equivalent with reduced channel count (1 channel), same isolation and speed class
ISO722MD: Parametric equivalent with reduced channel count (1 channel), obsolete status

Category 2: Cross-Manufacturer Alternatives (Different Technology)

ADUM1200 series (Analog Devices): Magnetic coupling technology, lower data rates (1-25Mbps), extended supply range (2.7V ~ 5.5V)
IL 611-3E (NVE Corp): GMR technology, 100Mbps data rate, reduced CMTI (15kV/µs)

Parameter Comparison

Part Number	Manufacturer	Technology	Channels	Isolation (Vrms)	Data Rate (Mbps)	CMTI (kV/µs)	tpLH/tpHL (ns)	Supply (V)	Temp Range (°C)	Package	Status
ISO7220MD	TI	Capacitive	2	2500	150	25	16/16	3.0-5.5	-40 to 125	8-SOIC	Last Time Buy
ISO7220MDR	TI	Capacitive	2	2500	150	25	16/16	3.0-5.5	-40 to 125	8-SOIC	Active
ISO721MD	TI	Capacitive	1	2500	150	25	16/16	3.0-5.5	-40 to 125	8-SOIC	Last Time Buy
ISO722MD	TI	Capacitive	1	2500	150	25	16/16	3.0-5.5	-40 to 125	8-SOIC	Obsolete
ADUM1200ARZ	Analog Devices	Magnetic	2	2500	1	25	150/150	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200ARZ-RL7	Analog Devices	Magnetic	2	2500	1	25	150/150	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200BRZ	Analog Devices	Magnetic	2	2500	10	25	50/50	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200BRZ-RL7	Analog Devices	Magnetic	2	2500	10	25	50/50	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200CRZ	Analog Devices	Magnetic	2	2500	25	25	45/45	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200CRZ-RL7	Analog Devices	Magnetic	2	2500	25	25	45/45	2.7-5.5	-40 to 105	8-SOIC	Active
IL 611-3E	NVE Corp	GMR	2	2500	100	15	15/15	3.0-5.5	-40 to 85	8-SOIC	Active

Engineering Selection Recommendations

Recommended Primary Substitute: ISO7220MDR

ISO7220MDR is the manufacturer-recommended direct equivalent. It maintains identical electrical specifications and package configuration while offering Active product status with significantly higher inventory availability (32,900 units). The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect electrical performance. This part is ROHS3 compliant and REACH unaffected, matching the compliance profile of the original ISO7220MD.

Alternative Substitutes for Reduced Channel Requirements: ISO721MD and ISO722MD

ISO721MD provides identical electrical performance with single-channel configuration. It maintains 150Mbps data rate, 25kV/µs CMTI, and 2500Vrms isolation in the same 8-SOIC package. However, ISO721MD carries Last Time Buy status. ISO722MD is obsolete and not recommended for new designs.

Cross-Manufacturer Alternatives: ADUM1200 Series

The ADUM1200 series from Analog Devices offers 2-channel, 2500Vrms isolation with Active product status and extended supply voltage range (2.7V ~ 5.5V). However, these parts employ magnetic coupling technology and feature significantly lower data rates:

ADUM1200ARZ/ARZ-RL7: 1Mbps
ADUM1200BRZ/BRZ-RL7: 10Mbps
ADUM1200CRZ/CRZ-RL7: 25Mbps

These alternatives are suitable only for applications where 150Mbps performance is not required. All ADUM1200 variants are ROHS3 compliant and REACH unaffected.

Alternative Substitute: IL 611-3E

IL 611-3E from NVE Corp provides 2500Vrms isolation with 100Mbps data rate using GMR technology. It meets the 25kV/µs CMTI requirement and operates within the 3V ~ 5.5V supply range. However, the operating temperature range is limited to -40°C ~ 85°C, which does not support the full -40°C ~ 125°C range of the ISO7220MD. This part is ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can ISO7220MDR be used as a direct replacement for ISO7220MD?

A: Yes. ISO7220MDR is electrically identical to ISO7220MD with matching isolation voltage (2500Vrms), channel count (2), data rate (150Mbps), CMTI (25kV/µs), and package (8-SOIC). The only difference is packaging format. Both are ROHS3 compliant. ISO7220MDR has Active status with higher inventory availability.

Q: What is the key difference between ISO7220MD and ISO721MD?

A: ISO721MD has a single isolated channel instead of two channels. All other electrical parameters—isolation voltage, data rate, CMTI, propagation delay, and supply voltage—are identical. ISO721MD is suitable only if your application requires single-channel isolation.

Q: Why do ADUM1200 parts have lower data rates than ISO7220MD?

A: ADUM1200 devices use magnetic coupling technology, while ISO7220MD uses capacitive coupling. These different isolation technologies result in different performance characteristics. ADUM1200 parts are optimized for lower data rate applications but offer extended supply voltage range (2.7V ~ 5.5V).

Q: Is IL 611-3E compatible with applications requiring -40°C ~ 125°C operation?

A: No. IL 611-3E operates only to 85°C maximum, which does not meet the full -40°C ~ 125°C operating range of ISO7220MD. This part is suitable only for applications with reduced temperature requirements.

Q: What packaging options are available for ISO7220 equivalents?

A: ISO7220MD is supplied in Tube packaging. ISO7220MDR is available in Cut Tape & Digi-Reel format. Both use the same 8-SOIC (0.154", 3.90mm Width) package. Packaging format does not affect electrical performance or pin compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—ISO7220MDR, ISO721MD, ISO722MD, ADUM1200 series, and IL 611-3E—are ROHS3 compliant. All are REACH unaffected except where noted in individual specifications.

Q: Which substitute offers the best long-term availability?

A: ISO7220MDR offers the highest inventory (32,900 units) with Active product status, making it the most suitable choice for long-term supply chain planning. ADUM1200 series variants also maintain Active status with substantial inventory levels.

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