ISO722DRG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO722DRG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 1 channel unidirectional configuration, and 100Mbps data rate in an 8-SOIC package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The ISO722DRG4 uses capacitive coupling technology and operates across a 3V to 5.5V supply range with a -40°C to 125°C temperature range. Its primary application is digital signal isolation in industrial and consumer electronics requiring moderate isolation voltage and data rates.

Substiute Parts

ISO722DRG4

Texas InstrumentsIn Stock: 5206ISO722DRG4 Datasheet

Current PartRFQ

ISO721DR

Texas InstrumentsIn Stock: 25202ISO721DR Datasheet

Parametric EquivalentRFQ

ISO722DR

Texas InstrumentsIn Stock: 2253ISO722DR Datasheet

Parametric EquivalentRFQ

SI8610AB-B-ISR

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

MFR RecommendedRFQ

SI8710CD-B-ISR

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

MFR RecommendedRFQ

SI8719BC-A-ISR

Skyworks Solutions Inc.In Stock: 3851SI8719BC-A-ISR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO722DRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Isolation voltage: 2500Vrms minimum
• Channel configuration: 1 channel, unidirectional
• Package type: 8-SOIC form factor
• Supply voltage range: Must encompass 3V ~ 5.5V
• Operating temperature: -40°C ~ 125°C minimum
• Technology: Capacitive coupling

Parametric Equivalents maintain identical or superior electrical characteristics across all critical parameters, enabling direct replacement without circuit modification.

Manufacturer Recommended Substitutes are approved alternatives that may have different secondary characteristics (such as data rate, propagation delay, or CMTI) but remain functionally compatible within the isolation and packaging constraints.

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

ISO721DR and ISO722DR are parametric equivalents of the ISO722DRG4. Both maintain identical electrical specifications including 2500Vrms isolation, 100Mbps data rate, 25kV/µs CMTI, and 8-SOIC packaging. ISO722DR is the tape and reel variant of the same base product. Both parts are active and ROHS3 compliant with MSL 1 rating, matching the original part's environmental specifications.

Manufacturer Recommended Substitutes:

SI8610AB-B-ISR (Skyworks Solutions) maintains 2500Vrms isolation and 8-SOIC packaging but operates at 1Mbps data rate with 35kV/µs CMTI. This substitute is suitable for applications where lower data rates are acceptable. MSL rating is 2A, requiring controlled storage conditions.

SI8710CD-B-ISR (Skyworks Solutions) provides higher isolation voltage (5000Vrms) in a 6-SOIC package with different pin configuration. This part is not pin-compatible and requires PCB redesign. Supply voltage range extends to 30V, offering broader operating flexibility.

SI8719BC-A-ISR (Skyworks Solutions) offers 3750Vrms isolation with 15Mbps data rate in 8-SOIC packaging. This part maintains pin compatibility and provides intermediate performance between the original and lower-speed alternatives. MSL rating is 3, requiring more stringent moisture control.

Selection Basis:

• ISO721DR and ISO722DR are recommended for direct replacement where product continuity is required
• SI8610AB-B-ISR is suitable for low-speed isolation applications
• SI8719BC-A-ISR provides a mid-range alternative with moderate performance trade-offs
• SI8710CD-B-ISR requires circuit redesign due to package incompatibility

All substitute parts maintain ROHS3 compliance and -40°C to 125°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can ISO721DR directly replace ISO722DRG4 without circuit modification?

A: Yes. ISO721DR is a parametric equivalent with identical electrical specifications, isolation voltage, data rate, propagation delay, and 8-SOIC package dimensions. The only difference is packaging format (tape and reel versus cut tape). No circuit modification is required.

Q: What is the key difference between ISO722DR and ISO722DRG4?

A: ISO722DR is the tape and reel packaged variant of the same base product (ISO722). Electrical specifications are identical. The suffix "G4" in ISO722DRG4 indicates the cut tape packaging format. Both parts are functionally equivalent.

Q: Why does SI8710CD-B-ISR have a different package size?

A: SI8710CD-B-ISR uses a 6-SOIC (0.295", 7.50mm) package compared to the 8-SOIC (0.154", 3.90mm) of the ISO722DRG4. This package incompatibility requires PCB redesign and is not recommended for direct substitution unless the application specifically requires higher isolation voltage (5000Vrms).

Q: Can SI8610AB-B-ISR be used in high-speed applications?

A: No. SI8610AB-B-ISR operates at 1Mbps data rate, significantly lower than the ISO722DRG4's 100Mbps specification. This substitute is only suitable for low-speed isolation applications. For applications requiring 100Mbps performance, use ISO721DR or ISO722DR.

Q: What does MSL rating mean for component storage?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be stored in standard conditions before requiring baking. ISO722DRG4, ISO721DR, and ISO722DR have MSL 1 (unlimited storage). SI8610AB-B-ISR has MSL 2A (4 weeks), and SI8710CD-B-ISR and SI8719BC-A-ISR have MSL 3 (168 hours). Higher MSL ratings require more controlled storage conditions.

Q: Is SI8719BC-A-ISR pin-compatible with ISO722DRG4?

A: Yes. SI8719BC-A-ISR maintains the same 8-SOIC package and pin configuration as ISO722DRG4. However, electrical specifications differ: 3750Vrms isolation and 15Mbps data rate versus 2500Vrms and 100Mbps. Verify that your application can operate within these performance parameters before substitution.

Q: Which substitute part has the best availability?

A: ISO721DR has the highest inventory (25,100 pcs), followed by SI8710CD-B-ISR (8,543 pcs) and SI8610AB-B-ISR (4,167 pcs). ISO722DR has 2,239 pcs available. Inventory levels should be confirmed with your supplier for current availability.