ISO7730FDBQR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7730FDBQR is a general purpose digital isolator manufactured by Texas Instruments, featuring 3000Vrms isolation voltage, 3 channels, and 100Mbps data rate in a 16-SSOP surface mount package. The device is currently active in production and widely available. Substitute parts may be required due to supply constraints, design optimization for specific application requirements, or cost considerations while maintaining functional compatibility within defined electrical parameters.

Substiute Parts

ISO7730FDBQR

Texas InstrumentsIn Stock: 1498ISO7730FDBQR Datasheet

Current PartRFQ

SI8035AA-B-IU

Skyworks Solutions Inc.In Stock: 21227SI8035AA-B-IU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7730FDBQR is determined by the following critical parameters:

• Isolation Voltage: Substitute parts must maintain minimum 3000Vrms isolation to preserve system safety margins and regulatory compliance
• Channel Count & Configuration: 3 channels with unidirectional input configuration (3/0) is mandatory
• Package Compatibility: 16-SSOP form factor ensures PCB layout compatibility and mechanical fit
• Technology Platform: Capacitive coupling technology ensures functional equivalence
• Supply Voltage Range: Must support the 2.25V ~ 5.5V operating window
• Operating Temperature: Must cover the -55°C ~ 125°C range
• Compliance: RoHS3 compliance required for regulatory alignment

The SI8035AA-B-IU does not meet the isolation voltage requirement (1000Vrms vs. 3000Vrms required) and therefore cannot serve as a direct substitute for applications requiring 3000Vrms isolation. This part represents a lower-tier isolation specification and is suitable only for applications with reduced isolation voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

The SI8035AA-B-IU is not recommended as a substitute for the ISO7730FDBQR in applications requiring the specified 3000Vrms isolation voltage. The substitute part operates at 1000Vrms isolation, which represents a 67% reduction in isolation capability and does not meet the electrical requirements of systems designed around the ISO7730FDBQR specification.

Additional incompatibilities include reduced data rate (10Mbps vs. 100Mbps), lower common mode transient immunity (35kV/µs vs. 85kV/µs), narrower supply voltage range (3.15V minimum vs. 2.25V minimum), and reduced operating temperature range (-40°C minimum vs. -55°C minimum).

Both parts maintain ROHS3 compliance and capacitive coupling technology. Selection should be based on the actual isolation voltage, data rate, and environmental requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the SI8035AA-B-IU replace the ISO7730FDBQR in my design?

A: No. The SI8035AA-B-IU operates at 1000Vrms isolation versus the 3000Vrms required by the ISO7730FDBQR. This represents a significant reduction in isolation capability and does not meet the electrical specification of systems designed for 3000Vrms isolation.

Q: What are the key differences between these parts?

A: The primary differences are isolation voltage (3000Vrms vs. 1000Vrms), data rate (100Mbps vs. 10Mbps), common mode transient immunity (85kV/µs vs. 35kV/µs), supply voltage minimum (2.25V vs. 3.15V), and operating temperature minimum (-55°C vs. -40°C).

Q: Are the packages compatible?

A: Both parts use 16-pin packages with 0.154" width and 3.90mm body width. The ISO7730FDBQR uses 16-SSOP while the SI8035AA-B-IU uses 16-QSOP. While mechanically similar, these are distinct package designations with potential pinout and footprint variations that require verification.

Q: What applications require 3000Vrms isolation?

A: High-voltage industrial systems, power conversion equipment, motor control circuits, and applications requiring enhanced galvanic isolation for safety and noise immunity typically require 3000Vrms or higher isolation ratings.

Q: Are both parts RoHS compliant?

A: Yes, both the ISO7730FDBQR and SI8035AA-B-IU are ROHS3 compliant and REACH unaffected.