ISO721MDG4 General Purpose Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO721MDG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, single channel unidirectional configuration, and 150Mbps data rate in an 8-SOIC package. The device is currently obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production continuity. Alternative parts must maintain functional compatibility across isolation voltage, channel configuration, data rate, and physical packaging requirements.

Substiute Parts

ISO721MDG4

Texas InstrumentsIn Stock: 1080ISO721MDG4 Datasheet

Current PartRFQ

ISO721MD

Texas InstrumentsIn Stock: 1392ISO721MD Datasheet

MFR RecommendedRFQ

ISO721MDR

Texas InstrumentsIn Stock: 5500ISO721MDR Datasheet

MFR RecommendedRFQ

ISO722MD

Texas InstrumentsIn Stock: 1509ISO722MD Datasheet

Parametric EquivalentRFQ

SI8610AB-B-ISR

Skyworks Solutions Inc.In Stock: 4240SI8610AB-B-ISR Datasheet

MFR RecommendedRFQ

SI8610EC-B-ISR

Skyworks Solutions Inc.In Stock: 8036SI8610EC-B-ISR Datasheet

MFR RecommendedRFQ

SI8710CD-B-ISR

Skyworks Solutions Inc.In Stock: 8568SI8710CD-B-ISR Datasheet

MFR RecommendedRFQ

SI8715BC-A-ISR

Skyworks Solutions Inc.In Stock: 2095SI8715BC-A-ISR Datasheet

MFR RecommendedRFQ

SI8716BC-A-ISR

Skyworks Solutions Inc.In Stock: 8122SI8716BC-A-ISR Datasheet

MFR RecommendedRFQ

SI8719BC-A-IS

Skyworks Solutions Inc.In Stock: 2086SI8719BC-A-IS Datasheet

MFR RecommendedRFQ

SI8720BC-A-IS

Skyworks Solutions Inc.In Stock: 897SI8720BC-A-IS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISO721MDG4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Isolation voltage rating (minimum 2500Vrms required)
• Single channel, unidirectional configuration
• 8-SOIC package form factor
• Data rate capability (minimum 150Mbps for direct replacement)
• Supply voltage range compatibility (3V ~ 5.5V overlap)
• Operating temperature range (-40°C ~ 125°C)
• Capacitive coupling technology

Manufacturer Recommended Substitutes (Direct Replacements): Parts ISO721MD and ISO721MDR are direct manufacturer-recommended substitutes from Texas Instruments, maintaining identical electrical specifications and package configuration with different packaging formats (Tube and Cut Tape/Digi-Reel respectively).

Parametric Equivalents: ISO722MD provides equivalent isolation voltage and channel configuration but represents an obsolete variant within the same product family.

Cross-Manufacturer Alternatives: Skyworks Solutions SI8610AB-B-ISR, SI8610EC-B-ISR, SI8715BC-A-ISR, SI8716BC-A-ISR, SI8719BC-A-IS, and SI8720BC-A-IS offer functional substitution with varying isolation voltage ratings (3750Vrms to 5000Vrms), data rates, and CMTI specifications. SI8710CD-B-ISR operates at 5000Vrms isolation with reduced data rate (1Mbps) and different package dimensions (6-SOIC).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: ISO721MDR

ISO721MDR is the preferred substitute, maintaining identical electrical specifications and 8-SOIC package configuration as the ISO721MDG4. The part is currently in active production status with 5400 units in stock, ensuring supply continuity. ROHS3 compliance and REACH unaffected status align with the original component certifications. Cut Tape and Digi-Reel packaging format supports both prototype and production volume requirements.

Secondary Recommendation: ISO721MD

ISO721MD provides identical electrical performance and packaging but carries Last Time Buy status, indicating limited future availability. This option is suitable for near-term production requirements where 1355 units are currently available in Tube packaging format.

Cross-Manufacturer Alternatives:

SI8610EC-B-ISR offers active production status with enhanced isolation voltage (3750Vrms) and identical 150Mbps data rate in 8-SOIC package. Higher CMTI rating (35kV/µs versus 25kV/µs) provides improved noise immunity. Extended supply voltage range (2.5V ~ 5.5V) accommodates broader system designs. Moisture sensitivity level 2A requires controlled storage conditions.

SI8715BC-A-ISR and SI8716BC-A-ISR provide 3750Vrms isolation with 15Mbps data rate in 8-SOIC package. These parts are suitable for applications where reduced data rate is acceptable and enhanced isolation voltage is beneficial. Both maintain active production status with substantial inventory availability.

SI8710CD-B-ISR operates at 5000Vrms isolation but requires evaluation for package compatibility due to 6-SOIC form factor (0.295", 7.50mm Width versus 0.154", 3.90mm Width) and reduced data rate (1Mbps). Extended supply voltage range (3V ~ 30V) supports diverse power supply architectures.

Frequently Asked Questions (FAQ)

Q: Can ISO721MDR be used as a direct drop-in replacement for ISO721MDG4?

A: Yes. ISO721MDR maintains identical isolation voltage (2500Vrms), data rate (150Mbps), channel configuration (1 channel unidirectional), and 8-SOIC package dimensions. The only difference is packaging format (Cut Tape/Digi-Reel versus the original format). Electrical performance and PCB footprint are identical.

Q: What is the key difference between ISO721MD and ISO721MDR?

A: Both parts provide identical electrical specifications and package configuration. The difference is packaging format: ISO721MD uses Tube packaging while ISO721MDR uses Cut Tape and Digi-Reel format. ISO721MDR is in active production status; ISO721MD is Last Time Buy. For new designs, ISO721MDR is recommended.

Q: Can SI8610EC-B-ISR replace ISO721MDG4 in all applications?

A: SI8610EC-B-ISR provides higher isolation voltage (3750Vrms versus 2500Vrms) and identical data rate (150Mbps) in the same 8-SOIC package. The higher isolation rating is backward compatible. However, the part has moisture sensitivity level 2A (4 weeks) compared to level 1 (unlimited) for the original, requiring controlled storage. Supply voltage range is 2.5V ~ 5.5V, which overlaps with the original 3V ~ 5.5V specification.

Q: Why do SI8715BC-A-ISR and SI8716BC-A-ISR have lower data rates than the original?

A: These Skyworks parts operate at 15Mbps data rate versus 150Mbps for the ISO721MDG4. They are suitable only for applications where lower bandwidth is acceptable. Selection depends on system requirements; they are not direct replacements for high-speed applications.

Q: Is SI8710CD-B-ISR compatible with the original PCB layout?

A: No. SI8710CD-B-ISR uses 6-SOIC package (0.295", 7.50mm Width) versus 8-SOIC (0.154", 3.90mm Width) for the original. PCB footprint modification is required. Additionally, data rate is reduced to 1Mbps, limiting applicability to low-speed isolation requirements.

Q: What compliance certifications are maintained across substitute parts?

A: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original ISO721MDG4 certifications. Moisture sensitivity levels vary: Texas Instruments parts maintain MSL 1 (unlimited); Skyworks parts range from MSL 2A to MSL 3, requiring appropriate handling protocols.

Q: Can I mix packaging formats (Tube, Cut Tape, Digi-Reel) in production?

A: Yes. ISO721MD (Tube) and ISO721MDR (Cut Tape/Digi-Reel) are electrically identical and use the same 8-SOIC footprint. Packaging format selection depends on assembly process requirements and volume handling. Both formats are compatible with standard surface mount assembly equipment.