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


Product details


Serial clock Uni-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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SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other I2C isolators


  • Robust Isolated Bidirectional, I2C Compatible, Communication
    • ISO1640: Bidirectional Isolated SDA and SCL communication
    • ISO1641: Bidirectional Isolated SDA and unidirectional SCL communication
    • ISO1644: Bidirectional Isolated SDA and SCL communication with 3 Unidirectional GPIO channels
    • Hot-Swappable SDA and SCL
  • Bidirectional data transfer up to 1.7 MHz Operation
  • Up to 3 additional unidirectional isolation channels supporting speeds up to 50 Mbps operation
  • Robust isolation barrier with enhanced EMC:
    • >100-year projected lifetime at 450 VRMS working voltage (D-8) and 1500 VRMS working voltage (DW-16)
    • Up to 5000 VRMS isolation rating
    • Up to 10 kV reinforced surge capability
    • ±100 kV/µs typical CMTI
    • ±8 kV IEC-ESD 61000-4-2 contact discharge protection across isolation barrier
    • Same side ±8 kV IEC-ESD unpowered contact discharge on SCL2 and SDA2 (Side 2)
  • 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)
  • 16-SOIC (DW-16) and 8-SOIC (D-8) Package Options
  • –40°C to +125°C Operating Temperature
  • Safety-Related Certifications (planned):
    • UL 1577 Component Recognition Program
    • DIN VDE V 0884-11
    • IEC 62368-1, IEC 61010-1, IEC 60601-1 and GB4943.1-2011 certifications

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The ISO1644,ISO1640 and ISO1641 (ISO164x) devices are hot swappable, low-power, bidirectional isolators that are compatible with I2C interfaces. The ISO164x supports UL 1577 isolation ratings of 5000 VRMS in the 16-DW package, and 3000 VRMS in the 8-D package. Each I2C 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. The ISO1644 intregrates 3 unidirectional CMOS isolation channels which can be used for static GPIO isolation or to isolate a Serial Peripheral Interface (SPI) bus. This family includes basic and reinforced insulation devices certified by VDE, UL, CSA, TUV and CQC. The ISO1644 and ISO1640 has two isolated bidirectional channels for clock and data lines while the ISO1641 has a bidirectional data and a unidirectional clock channel. The ISO164x family 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 ISO164x Hot-Swappable Bidirectional I2C Isolators with Enhanced EMC and GPIOs datasheet (Rev. C) Jun. 11, 2021
Certificate CSA Certification (Rev. Q) Jun. 14, 2021
Certificate VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. R) 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
Application note How to Replace Optocouplers with Digital Isolators in Standard Interface Circuit (Rev. A) May 19, 2021
Application note How Do Isolated I2C Buffers with Hot-Swap Capability and IEC ESD Improve ... Mar. 25, 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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