ISO7220MDG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7220MDG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 2 channels, and 150Mbps data rate in an 8-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The ISO7220MDG4 uses capacitive coupling technology and operates across a supply voltage range of 3V to 5.5V with an operating temperature range of -40°C to 125°C. The part is ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level).

Key Parameters

Parameter	Value
Manufacturer Part Number	ISO7220MDG4
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Number of Channels	2
Voltage - Isolation	2500Vrms
Common Mode Transient Immunity (Min)	25kV/µs
Data Rate	150Mbps
Propagation Delay tpLH / tpHL (Max)	16ns / 16ns
Pulse Width Distortion (Max)	1ns
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ISO7220MDG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Number of Channels: 2 (unidirectional)
Voltage - Isolation: 2500Vrms
Common Mode Transient Immunity: 25kV/µs minimum
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Data Rate: 150Mbps or higher
Propagation Delay: 16ns or lower
Voltage - Supply: 3V ~ 5.5V range compatibility
Operating Temperature: -40°C ~ 125°C range compatibility

Substitution Groups:

Group 1: Direct Texas Instruments Equivalents (Same Base Product, Different Packaging)

ISO7220MD (Tube packaging, Last Time Buy status)
ISO7220MDR (Cut Tape & Digi-Reel packaging, Active status)

These parts maintain identical electrical specifications and differ only in packaging format and product lifecycle status.

Group 2: Parametric Equivalents (Single Channel, Same Isolation Voltage)

ISO721MD (1 channel, Last Time Buy status)
ISO722MD (1 channel, Obsolete status)

These parts share the same isolation voltage, CMTI, data rate, and package but feature single-channel configuration. Suitable for applications requiring only one isolation channel.

Group 3: Alternative Technology Substitutes (Magnetic Coupling, Analog Devices)

ADUM1200ARZ (1Mbps, Tube packaging)
ADUM1200ARZ-RL7 (1Mbps, Cut Tape & Digi-Reel)
ADUM1200BRZ (10Mbps, Tube packaging)
ADUM1200BRZ-RL7 (10Mbps, Cut Tape & Digi-Reel)
ADUM1200CRZ (25Mbps, Tube packaging)
ADUM1200CRZ-RL7 (25Mbps, Cut Tape & Digi-Reel)

These parts use magnetic coupling technology instead of capacitive coupling. They maintain 2500Vrms isolation, 2 channels, 25kV/µs CMTI, and 8-SOIC packaging. Data rate variants range from 1Mbps to 25Mbps. Operating temperature range is -40°C to 105°C (5°C lower maximum than ISO7220MDG4). Supply voltage range is 2.7V to 5.5V (0.7V lower minimum).

Parameter Comparison

Part Number	Manufacturer	Technology	Channels	Isolation (Vrms)	CMTI (kV/µs)	Data Rate (Mbps)	tpLH/tpHL (ns)	PWD (ns)	Supply (V)	Temp (°C)	Package	Status
ISO7220MDG4	TI	Capacitive	2	2500	25	150	16/16	1	3-5.5	-40 to 125	8-SOIC	Obsolete
ISO7220MD	TI	Capacitive	2	2500	25	150	16/16	1	3-5.5	-40 to 125	8-SOIC	Last Time Buy
ISO7220MDR	TI	Capacitive	2	2500	25	150	16/16	1	3-5.5	-40 to 125	8-SOIC	Active
ISO721MD	TI	Capacitive	1	2500	25	150	16/16	1	3-5.5	-40 to 125	8-SOIC	Last Time Buy
ISO722MD	TI	Capacitive	1	2500	25	150	16/16	1	3-5.5	-40 to 125	8-SOIC	Obsolete
ADUM1200ARZ	ADI	Magnetic	2	2500	25	1	150/150	40	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200ARZ-RL7	ADI	Magnetic	2	2500	25	1	150/150	40	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200BRZ	ADI	Magnetic	2	2500	25	10	50/50	3	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200BRZ-RL7	ADI	Magnetic	2	2500	25	10	50/50	3	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200CRZ	ADI	Magnetic	2	2500	25	25	45/45	3	2.7-5.5	-40 to 105	8-SOIC	Active
ADUM1200CRZ-RL7	ADI	Magnetic	2	2500	25	25	45/45	3	2.7-5.5	-40 to 105	8-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

ISO7220MDR is the recommended primary substitute. It maintains all electrical and mechanical specifications of the ISO7220MDG4 while offering active product status and superior availability (32,900 units in stock). The part is supplied in Cut Tape & Digi-Reel packaging, suitable for both manual and automated assembly processes.

ISO7220MD provides an alternative with identical specifications but Last Time Buy status, available in Tube packaging with 6,300 units in stock.

For Single-Channel Applications:

ISO721MD and ISO722MD are suitable when only one isolation channel is required. Both maintain the same isolation voltage, CMTI, data rate, and package specifications. ISO721MD has Last Time Buy status with 1,355 units available. ISO722MD is obsolete with 1,405 units in stock.

For Alternative Technology Substitution:

The ADUM1200 series from Analog Devices uses magnetic coupling technology and maintains 2500Vrms isolation, 2 channels, 25kV/µs CMTI, and 8-SOIC packaging. Selection within this series depends on data rate requirements:

ADUM1200ARZ / ADUM1200ARZ-RL7: 1Mbps data rate. Suitable for low-speed applications. ADUM1200ARZ-RL7 is preferred with 19,747 units in stock and active status.
ADUM1200BRZ / ADUM1200BRZ-RL7: 10Mbps data rate. Intermediate speed applications. ADUM1200BRZ-RL7 offers 13,900 units in stock and active status.
ADUM1200CRZ / ADUM1200CRZ-RL7: 25Mbps data rate. Closest performance to ISO7220MDG4 (150Mbps). ADUM1200CRZ-RL7 provides 17,912 units in stock and active status.

Critical Compatibility Notes:

ADUM1200 series parts operate at -40°C to 105°C maximum temperature, which is 20°C lower than ISO7220MDG4. Applications requiring operation above 105°C must use Texas Instruments ISO7220 series parts.

ADUM1200 series minimum supply voltage is 2.7V, compared to 3V for ISO7220MDG4. Applications with 2.7V to 3V supply rails can use ADUM1200 series exclusively.

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can ISO7220MDR directly replace ISO7220MDG4?

A: Yes. ISO7220MDR is electrically and mechanically identical to ISO7220MDG4. The only differences are packaging format (Cut Tape & Digi-Reel versus the original format) and product status (Active versus Obsolete). Pin configuration, electrical specifications, and package dimensions are identical.

Q: What is the difference between ISO7220MD and ISO7220MDR?

A: Both parts are electrically identical to ISO7220MDG4. ISO7220MD is supplied in Tube packaging with Last Time Buy status. ISO7220MDR is supplied in Cut Tape & Digi-Reel packaging with Active status and higher inventory availability. Selection depends on packaging requirements and procurement timeline.

Q: Can I use ISO721MD or ISO722MD as substitutes?

A: ISO721MD and ISO722MD are suitable only if your application requires a single isolation channel. Both maintain the same isolation voltage (2500Vrms), CMTI (25kV/µs), data rate (150Mbps), and package (8-SOIC) as ISO7220MDG4. If your design requires two isolation channels, these parts are not compatible.

Q: What are the key differences between capacitive and magnetic coupling technologies?

A: ISO7220MDG4 uses capacitive coupling; ADUM1200 series uses magnetic coupling. Both achieve 2500Vrms isolation and 25kV/µs CMTI. The primary differences are data rate capability and operating temperature range. ISO7220MDG4 supports 150Mbps; ADUM1200 series maximum is 25Mbps. ISO7220MDG4 operates to 125°C; ADUM1200 series maximum is 105°C.

Q: Can ADUM1200 series parts operate at the same data rates as ISO7220MDG4?

A: No. ISO7220MDG4 supports 150Mbps data rate. The fastest ADUM1200 variant (ADUM1200CRZ/ADUM1200CRZ-RL7) supports 25Mbps. For applications requiring 150Mbps data rate, only Texas Instruments ISO7220 series parts are suitable.

Q: Are there temperature limitations when using ADUM1200 series substitutes?

A: Yes. ADUM1200 series parts operate from -40°C to 105°C maximum. ISO7220MDG4 operates to 125°C. Applications requiring operation above 105°C must use ISO7220 series parts. Verify your application's maximum operating temperature before selecting ADUM1200 series substitutes.

Q: What packaging options are available for substitute parts?

A: Texas Instruments ISO7220 series parts are available in Tube (ISO7220MD) and Cut Tape & Digi-Reel (ISO7220MDR) packaging. Analog Devices ADUM1200 series parts are available in Tube and Cut Tape & Digi-Reel packaging variants. All maintain the same 8-SOIC (0.154", 3.90mm Width) package footprint.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity level, matching the compliance profile of ISO7220MDG4.

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

A: ISO7220MDR offers the best long-term availability with Active product status and 32,900 units in stock. This part is the recommended primary substitute for new designs and ongoing procurement.

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