ISO7340FCDW Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7340FCDW is a general purpose digital isolator manufactured by Texas Instruments, featuring 3000Vrms isolation voltage, 4 channels, and 25Mbps data rate in a 16-SOIC surface mount package. The device is currently active in production status. Substitute parts are identified to provide design flexibility, inventory alternatives, and application-specific variants while maintaining electrical and mechanical compatibility.

Substiute Parts

ISO7340FCDW

Texas InstrumentsIn Stock: 3493ISO7340FCDW Datasheet

Current PartRFQ

ISO7340CDW

Texas InstrumentsIn Stock: 1678ISO7340CDW Datasheet

Parametric EquivalentRFQ

ISO7340CQDWQ1

Texas InstrumentsIn Stock: 1721ISO7340CQDWQ1 Datasheet

Parametric EquivalentRFQ

ISO7340FCQDWQ1

Texas InstrumentsIn Stock: 1086ISO7340FCQDWQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISO7340FCDW are qualified based on the following criteria:

Core Electrical Parameters (Must Match):

• Isolation voltage: 3000Vrms
• Number of channels: 4
• Data rate: 25Mbps
• Common mode transient immunity: 25kV/µs
• Propagation delay: 58ns maximum (both directions)
• Supply voltage range: 3V ~ 5.5V
• Operating temperature: -40°C ~ 125°C

Mechanical Parameters (Must Match):

• Package type: 16-SOIC (0.295", 7.50mm Width)
• Mounting type: Surface Mount

Allowed Variations:

• Packaging format (Tube vs. other standard formats)
• Pulse width distortion tolerance (4ns to 4.1ns)
• Grade designation (commercial vs. automotive AEC-Q100)
• Qualification level (standard vs. automotive qualified)

All substitute parts maintain identical functional performance and pinout compatibility with the main part number.

Parameter Comparison

Engineering Selection Recommendations

ISO7340CDW: Direct parametric equivalent with identical electrical specifications. Suitable for general purpose applications requiring standard commercial grade components. Lowest pulse width distortion specification (4ns) among all variants.

ISO7340CQDWQ1: Automotive grade variant with AEC-Q100 qualification. Select this part for automotive applications requiring automotive-qualified components while maintaining commercial temperature and performance specifications.

ISO7340FCQDWQ1: Automotive grade variant with AEC-Q100 qualification. Functionally equivalent to ISO7340CQDWQ1 with identical automotive qualification status. Selection between these two automotive variants depends on inventory availability and procurement lead time requirements.

All substitute parts maintain ROHS3 compliance and identical isolation performance. Selection should be based on application grade requirements (commercial vs. automotive) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can ISO7340CDW be used as a direct replacement for ISO7340FCDW?

A: Yes. ISO7340CDW is a parametric equivalent with identical electrical performance, isolation voltage, channel count, data rate, and package specifications. The only difference is packaging format designation, which does not affect functional compatibility.

Q: What is the difference between commercial and automotive grade variants?

A: ISO7340CQDWQ1 and ISO7340FCQDWQ1 are automotive grade parts with AEC-Q100 qualification. These variants are required for automotive applications. Commercial grade variants (ISO7340FCDW and ISO7340CDW) are suitable for industrial and consumer applications.

Q: Are all substitute parts pin-compatible?

A: Yes. All substitute parts use the 16-SOIC package with identical pinout and mechanical dimensions (0.295", 7.50mm Width). Direct PCB layout compatibility is maintained across all variants.

Q: What determines substitution eligibility?

A: Substitution is based on matching isolation voltage (3000Vrms), channel count (4), data rate (25Mbps), common mode transient immunity (25kV/µs), propagation delay (58ns maximum), supply voltage range (3V ~ 5.5V), operating temperature range (-40°C ~ 125°C), and package type (16-SOIC surface mount). Grade and qualification differences do not affect electrical substitution.

Q: Can automotive qualified parts replace commercial grade parts?

A: Yes. Automotive qualified variants (ISO7340CQDWQ1, ISO7340FCQDWQ1) meet or exceed commercial specifications and can be used in commercial applications. However, this substitution typically increases component cost.

Q: What is the significance of pulse width distortion variation (4ns vs. 4.1ns)?

A: Both specifications fall within acceptable tolerance for general purpose digital isolation applications. The 4ns specification (ISO7340CDW, ISO7340CQDWQ1, ISO7340FCQDWQ1) represents a tighter tolerance compared to the 4.1ns specification (ISO7340FCDW). Selection should be based on application timing requirements and availability.