ISO7821FDWW Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7821FDWW is a general purpose digital isolator manufactured by Texas Instruments, featuring 5700Vrms isolation voltage and 2-channel unidirectional isolation capability. This device operates at 100Mbps data rate with 100kV/µs common mode transient immunity in a 16-SOIC surface mount package. The part is currently in active production status with 2000 units in stock.

Substitute parts are identified when design requirements allow for reduced channel count or alternative packaging configurations while maintaining core electrical isolation and performance characteristics.

Substiute Parts

ISO7821FDWW

Texas InstrumentsIn Stock: 2042ISO7821FDWW Datasheet

Current PartRFQ

ISO7810DWW

Texas InstrumentsIn Stock: 1028ISO7810DWW Datasheet

Parametric EquivalentRFQ

ISO7821DWW

Texas InstrumentsIn Stock: 16432ISO7821DWW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISO7821FDWW are identified based on the following allowable parameter variations:

Primary Substitution Criteria:

• Isolation voltage: 5700Vrms (fixed requirement)
• Technology: Capacitive Coupling (fixed requirement)
• Data rate: 100Mbps (fixed requirement)
• Common mode transient immunity: 100kV/µs (fixed requirement)
• Package: 16-SOIC (fixed requirement)
• Supply voltage range: 2.25V ~ 5.5V (fixed requirement)
• Operating temperature: -55°C ~ 125°C (fixed requirement)

Variable Parameter Allowing Substitution:

• Number of channels: 2 channels (main part) or 1 channel (substitute)

The ISO7821FDWW can be substituted with the ISO7810DWW when circuit design requires only single-channel isolation. The ISO7821DWW serves as a direct equivalent with identical channel configuration.

Parameter Comparison

Engineering Selection Recommendations

ISO7821DWW is a direct equivalent to the ISO7821FDWW with identical electrical specifications and channel configuration. Both parts maintain active product status and full compliance with ROHS3 and REACH regulations. Selection between these two identical parts is determined by inventory availability and supply chain considerations.

ISO7810DWW is a parametric substitute applicable only when circuit design requirements specify single-channel isolation. This part maintains all critical electrical parameters including isolation voltage, data rate, common mode transient immunity, propagation delay, and supply voltage specifications. The reduction from 2 channels to 1 channel represents the only functional difference. All three parts share identical package geometry, technology platform, and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can ISO7810DWW replace ISO7821FDWW in all applications?

A: No. The ISO7810DWW provides only 1 isolation channel compared to the 2 channels in ISO7821FDWW. Substitution is valid only when circuit design requires single-channel isolation. Applications requiring dual-channel isolation must use ISO7821FDWW or ISO7821DWW.

Q: Are there differences in electrical performance between ISO7821FDWW and ISO7821DWW?

A: No. Both parts share identical electrical specifications including propagation delay, pulse width distortion, rise/fall time, and all other timing parameters. They are functionally equivalent.

Q: Do all three parts use the same package?

A: Yes. All three parts use the 16-SOIC (0.551", 14.00mm Width) surface mount package with identical pin spacing and footprint requirements.

Q: What is the isolation voltage rating for all substitute parts?

A: All parts maintain 5700Vrms isolation voltage rating. This parameter is fixed across the ISO7821FDWW, ISO7821DWW, and ISO7810DWW.

Q: Are there supply voltage or temperature range differences?

A: No. All three parts operate across the identical supply voltage range of 2.25V to 5.5V and temperature range of -55°C to 125°C.

Q: Do all parts meet the same regulatory compliance standards?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level (MSL 3, 168 hours) ratings.