Hot-swappable, robust-EMC bidirectional I2C isolator with unidirectional clock


Product details


Serial clock Bi-directional Number of channels (#) 2 Isolation rating (Vrms) 3000 Serial data Bi-directional Operating temperature range (C) -40 to 125 Data rate (Max) (Mbps) 1.7 Surge voltage rating (Vpk) 5000 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.25 open-in-new Find other I2C isolators

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  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • VDA320 Compliant
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 3A
    • Device CDM ESD Classification Level C6
  • Isolated Bidirectional, I2C Compatible, Communication
    • ISO1640-Q1: Bidirectional SDA and SCL
  • Supports up to 1.7 MHz Operation
  • Robust isolation barrier:
    • >100-year projected lifetime at 500 VRMS working voltage
    • Up to 3000 VRMS isolation rating
    • Up to 5 kV surge capability
    • ±100 kV/µs typical CMTI
  • Supply range: 3 V to 5.5 V (Side 1) and 2.25 V to 5.5 V (Side 2)
  • Open-Drain Outputs With 3.5-mA Side 1 and 50-mA Side 2 Sink Current Capability
  • Max capacitive load: 80 pF (Side 1) and 400 pF (Side 2)
  • 8-SOIC (D-8) Package Options
  • –40°C to +125°C Operating Temperature
  • ±8 kV IEC-ESD 61000-4-2 contact discharge protection across isolation barrier
  • Safety-Related Certifications (planned):
    • UL 1577 Component Recognition Program
    • DIN V VDE V 0884-11
    • IEC 60950-1, IEC62368-1, IEC 61010-1, IEC 60601-1 and GB4943.1-2011 certifications
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The ISO1640-Q1 (ISO164x-Q1) device is a hot swappable, low-power, bidirectional isolator that is compatible with I2C interfaces. This digital isolator supports UL 1577 isolation ratings of 3000 VRMS in the 8-D package. Each isolation channel in this low emissions device has a logic input and open drain output separated by a double capacitive silicon dioxide (SiO2) insulation barrier. This family includes devices certified by VDE, UL, CSA, TUV and CQC. The ISO1640-Q1 has two isolated bidirectional channels for clock and data lines. ISO1640-Q1 integrates logic required to support bidirectional channels, providing a much simpler design and smaller footprint when compared to optocoupler-based solutions.

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Technical documentation

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Type Title Date
* Data sheet ISO1640-Q1 Datasheet datasheet Feb. 22, 2019
Certificate TUV Certificate for Isolation Devices (Rev. J) Aug. 23, 2021
Certificate CQC Certification (Rev. G) Aug. 19, 2021
Certificate VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. S) Aug. 03, 2021
Certificate CSA Certification (Rev. Q) Jun. 14, 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen Jun. 11, 2021
Application note How to Isolate Signal and Power for I2C (Rev. B) May 19, 2021
Technical article Top 6 design questions about I2C isolators Mar. 13, 2019

Design & development

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Hardware development

document-generic User guide
ISO1640DEVM is an evaluaiton module used to help designers evaluate the ISO1640 and ISO1641 devices' performance for quick development and analysis of data transmission systems using ISO1640 and ISO1641 isolated I2C devices in 8-pin D and 16-pin DW packages.
  • Isolated, bidirectional, I2C-compatible communication
  • For evaluation of ISO1640 and ISO1641 devices in D and DW packages
  • Supply voltage and level translation range: 3 V to 5.5 V on side 1 and 2.25 V to 5.5 V on side 2
  • Test points and headers for standalone evaluation or evaluation with larger systems
  • (...)

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