ISO7320FCDR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7320FCDR is a general purpose digital isolator manufactured by Texas Instruments, designed for capacitive coupling isolation applications. This 2-channel, 3000Vrms rated device operates at 25Mbps with 25kV/µs common mode transient immunity in an 8-SOIC surface mount package. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical isolation specifications, channel configuration, package form factor, and operational parameters that ensure functional compatibility in circuit applications.

Substiute Parts

ISO7320FCDR

Texas InstrumentsIn Stock: 10362ISO7320FCDR Datasheet

Current PartRFQ

ISO7320CDR

Texas InstrumentsIn Stock: 18631ISO7320CDR Datasheet

Parametric EquivalentRFQ

ISO7320CQDRQ1

Texas InstrumentsIn Stock: 2998ISO7320CQDRQ1 Datasheet

Parametric EquivalentRFQ

ISO7320FCQDRQ1

Texas InstrumentsIn Stock: 8183ISO7320FCQDRQ1 Datasheet

Parametric EquivalentRFQ

SI8620BC-B-ISR

Skyworks Solutions Inc.In Stock: 36434SI8620BC-B-ISR Datasheet

MFR RecommendedRFQ

SI8620EC-B-ISR

Skyworks Solutions Inc.In Stock: 24889SI8620EC-B-ISR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISO7320FCDR are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Texas Instruments ISO7320 Series): Parts that maintain identical isolation voltage (3000Vrms), channel count (2), data rate (25Mbps), CMTI (25kV/µs), propagation delay, and 8-SOIC package specifications. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or automotive qualification grade. Parametric equivalents are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Alternatives (Skyworks SI8620 Series): Parts that exceed the electrical specifications of the ISO7320FCDR while maintaining the same 2-channel unidirectional configuration and 8-SOIC package. These devices feature higher isolation voltage (3750Vrms), increased data rate (150Mbps), and superior CMTI (35kV/µs). These alternatives are suitable for applications requiring enhanced performance margins or higher speed operation.

Key parameters determining substitution eligibility:

• Isolation voltage rating (minimum 3000Vrms)
• Number of channels (2)
• Channel type (Unidirectional)
• Package form factor (8-SOIC)
• Operating temperature range (-40°C ~ 125°C)
• Supply voltage compatibility (3V ~ 5.5V or 2.5V ~ 5.5V)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents): ISO7320CDR, ISO7320CQDRQ1, and ISO7320FCQDRQ1 are functionally equivalent to ISO7320FCDR. Selection among these three depends on packaging requirements and automotive qualification needs. ISO7320CDR is supplied in Cut Tape & Digi-Reel format. ISO7320CQDRQ1 and ISO7320FCQDRQ1 both carry AEC-Q100 automotive qualification and are suitable for automotive applications requiring this certification. ISO7320FCQDRQ1 is supplied in Tape & Reel format matching the original part's packaging.

For Enhanced Performance Applications: SI8620BC-B-ISR and SI8620EC-B-ISR from Skyworks Solutions provide superior electrical performance with 3750Vrms isolation, 150Mbps data rate, and 35kV/µs CMTI. These parts are suitable for applications requiring higher speed operation or enhanced noise immunity. Both maintain the same 8-SOIC package and operating temperature range. Supply voltage range extends to 2.5V minimum, providing broader compatibility with lower voltage systems.

Compliance Considerations: All listed parts maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity differs between manufacturers: Texas Instruments ISO7320 series specifies MSL 2 (1 Year), while Skyworks SI8620 series specifies MSL 2A (4 Weeks), requiring adjusted handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can ISO7320CDR replace ISO7320FCDR directly? A: Yes. ISO7320CDR is a parametric equivalent with identical electrical specifications (3000Vrms isolation, 25Mbps data rate, 25kV/µs CMTI) and the same 8-SOIC package. The only difference is packaging format: ISO7320CDR uses Cut Tape & Digi-Reel while ISO7320FCDR uses Tape & Reel. No circuit modifications are required.

Q: What is the difference between ISO7320CQDRQ1 and ISO7320FCQDRQ1? A: Both parts are parametrically equivalent to ISO7320FCDR with identical electrical specifications. The primary difference is packaging: ISO7320CQDRQ1 is supplied in Cut Tape & Digi-Reel format, while ISO7320FCQDRQ1 is supplied in Tape & Reel format. Both carry AEC-Q100 automotive qualification.

Q: Can SI8620BC-B-ISR or SI8620EC-B-ISR be used as drop-in replacements? A: SI8620 series parts are pin-compatible and package-compatible (8-SOIC) with the ISO7320FCDR. However, they exceed the original specifications with higher isolation voltage (3750Vrms vs. 3000Vrms), faster data rate (150Mbps vs. 25Mbps), and superior CMTI (35kV/µs vs. 25kV/µs). These are suitable for applications requiring enhanced performance but are not required for circuits designed to ISO7320 specifications.

Q: Are there supply voltage compatibility issues when substituting? A: ISO7320FCDR operates at 3V ~ 5.5V supply voltage. SI8620 series parts operate at 2.5V ~ 5.5V, providing broader compatibility with lower voltage systems. All Texas Instruments ISO7320 variants maintain the 3V ~ 5.5V range. Verify circuit supply voltage requirements before selection.

Q: What are the moisture sensitivity implications for storage and handling? A: ISO7320 series parts specify MSL 2 (1 Year), allowing one year of storage at controlled humidity before baking is required. SI8620 series parts specify MSL 2A (4 Weeks), requiring baking after four weeks of storage. Adjust component handling and storage protocols accordingly based on selected part.

Q: Are all listed parts suitable for automotive applications? A: ISO7320CQDRQ1 and ISO7320FCQDRQ1 carry AEC-Q100 automotive qualification. ISO7320FCDR, ISO7320CDR, SI8620BC-B-ISR, and SI8620EC-B-ISR do not carry automotive qualification. For automotive applications, select only AEC-Q100 qualified parts.