ISO721MDR Digital Isolator - Equivalent & Substitute Parts

Part Overview

The ISO721MDR is a general purpose digital isolator manufactured by Texas Instruments, rated for 2500Vrms isolation with 1 channel, 150Mbps data rate, and 25kV/µs common mode transient immunity. The device is packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration and is ROHS3 compliant with active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific parameter optimization.

Substiute Parts

ISO721MDR

Texas InstrumentsIn Stock: 5500ISO721MDR Datasheet

Current PartRFQ

ISO722MDR

Texas InstrumentsIn Stock: 2883ISO722MDR 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

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO721MDR is determined by the following critical parameters:

• Isolation Voltage: 2500Vrms minimum
• Number of Channels: 1 channel unidirectional
• Package Type: 8-SOIC (0.154", 3.90mm Width) surface mount
• Technology: Capacitive coupling digital isolator
• Supply Voltage Range: Compatibility with 3V ~ 5.5V operation
• Operating Temperature: -40°C ~ 125°C range
• Compliance: ROHS3 compliant

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalent (Same Isolation Voltage): ISO722MDR maintains identical electrical specifications with 2500Vrms isolation and 150Mbps data rate. Substitution is direct with packaging format difference (Tape & Reel vs. Cut Tape).

Category 2 - Manufacturer Recommended Alternatives (Enhanced or Specialized Performance): SI8610AB-B-ISR, SI8610EC-B-ISR, and SI8710CD-B-ISR offer alternative isolation voltage ratings, data rates, and CMTI specifications. These are suitable when application requirements permit parameter variation within the allowed electrical and mechanical envelope.

Parameter Comparison

Engineering Selection Recommendations

ISO722MDR: Direct parametric equivalent with identical electrical specifications. Suitable for applications requiring 2500Vrms isolation and 150Mbps data rate. Packaging format differs (Tape & Reel vs. Cut Tape); verify reel compatibility with assembly equipment. ROHS3 compliant with MSL 1 rating provides optimal moisture handling characteristics.

SI8610AB-B-ISR: Skyworks alternative with 2500Vrms isolation and enhanced CMTI (35kV/µs). Data rate reduced to 1Mbps; suitable for low-speed isolation applications. Supply voltage range extends to 2.5V minimum. MSL 2A requires controlled storage conditions (4 weeks). Pin-compatible 8-SOIC package.

SI8610EC-B-ISR: Skyworks alternative with elevated isolation voltage (3750Vrms) and 150Mbps data rate matching original performance. Enhanced CMTI (35kV/µs) and improved propagation delay (13ns). Supply voltage range extends to 2.5V minimum. MSL 2A requires controlled storage. Suitable for applications requiring higher isolation margin.

SI8710CD-B-ISR: Skyworks alternative with highest isolation voltage (5000Vrms) and extended supply range (3V ~ 30V). Data rate reduced to 1Mbps; CMTI reduced to 20kV/µs. Package differs to 6-SOIC (0.295", 7.50mm Width) requiring PCB layout modification. MSL 3 requires shorter storage window (168 hours). Suitable for high-voltage isolation applications with flexible timing requirements.

Frequently Asked Questions (FAQ)

Q: Can ISO722MDR directly replace ISO721MDR in production?

A: Yes. ISO722MDR is a parametric equivalent with identical electrical specifications (2500Vrms, 150Mbps, 25kV/µs CMTI, 8-SOIC package). The only difference is packaging format (Tape & Reel vs. Cut Tape). Verify reel specifications with your assembly equipment before implementation.

Q: What are the key differences between Skyworks SI8610 variants and the Texas Instruments ISO721MDR?

A: SI8610AB-B-ISR maintains 2500Vrms isolation but reduces data rate to 1Mbps and increases propagation delay to 35ns. SI8610EC-B-ISR increases isolation to 3750Vrms while maintaining 150Mbps data rate with faster propagation delay (13ns). Both offer enhanced CMTI (35kV/µs) and extended supply voltage range (2.5V minimum). MSL rating is 2A, requiring controlled storage.

Q: Is SI8710CD-B-ISR compatible with ISO721MDR designs?

A: SI8710CD-B-ISR is not pin-compatible. Package changes from 8-SOIC to 6-SOIC (0.295", 7.50mm Width), requiring PCB layout modification. Isolation voltage increases to 5000Vrms, but data rate reduces to 1Mbps and CMTI decreases to 20kV/µs. Supply voltage range extends to 30V maximum. Use only when application requirements permit these parameter changes and PCB redesign is feasible.

Q: What moisture sensitivity considerations apply to substitute parts?

A: ISO721MDR and ISO722MDR have MSL 1 (unlimited shelf life). SI8610AB-B-ISR and SI8610EC-B-ISR have MSL 2A (4-week storage limit after bag opening). SI8710CD-B-ISR has MSL 3 (168-hour storage limit). Verify storage and handling procedures align with your supply chain requirements before selecting alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. ISO721MDR, ISO722MDR, SI8610AB-B-ISR, SI8610EC-B-ISR, and SI8710CD-B-ISR are all ROHS3 compliant. All parts meet REACH unaffected status and EAR99 export classification.

Q: What supply voltage range considerations apply when selecting substitutes?

A: ISO721MDR operates at 3V ~ 5.5V. SI8610AB-B-ISR and SI8610EC-B-ISR extend minimum to 2.5V. SI8710CD-B-ISR extends maximum to 30V. Verify your circuit design supply voltage falls within the selected part's operating range before substitution.