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

Package | Pins | Size

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


  • Reliable Isolated Bidirectional, I2C Compatible, Communication
    • ISO1640: Fully Bidirectional Isolated SDA and SCL Communication
    • SDA and SCL Hot Swappable
  • Bidirectional data transfer up to 1.7 MHz Operation
  • Robust isolation barrier with enhanced EMC:
    • >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
    • ±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)
  • 8-SOIC (D-8) Package Options
  • –40°C to +125°C Operating Temperature
  • 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 (ISO164x) 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 has two isolated bidirectional channels for clock and data lines. ISO1640 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
* Datasheet ISO164x Hot-Swappable Bidirectional I2C Isolators with Enhanced EMC datasheet (Rev. A) Dec. 09, 2020
Application note How Do Isolated I2C Buffers with Hot-Swap Capability and IEC ESD Improve ... Mar. 25, 2021
More literature UL Certification (Rev. O) Feb. 03, 2021
User guide ISO1640DEVM Evaluation Module Users Guide Sep. 25, 2020
More literature ISO1640DEVM EU Declaration of Conformity (DoC) Sep. 02, 2020
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
  • (...)

Design tools & simulation

SLLM460.ZIP (28 KB) - IBIS Model

CAD/CAE symbols

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SOIC (D) 8 View options

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