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Dual Bidirectional, Optically Isolated
High-Speed I2C Bus Repeater

Our Optically Isolated I2C Bus Repeater is the industry's first integrated optical solution for I2C bus design that:

  • Minimizes PC board space usage
  • Reduces parts count for this function

Unlike magnetically isolated digital isolator ICs, this optical solution:

  • Needs no internal clocking, which is a primary source of EMI/RFI interference
  • Supports direct static-state buffering without refresh clocks

The CPC5902 features excellent reliability and very long operational life. Contact the factory for long-term reliability information.


CPC5902 Block Diagram

Data Sheet for CPC5902 (Rev 4)

Tech Brief - TB-101: Optically Isolating an I2C Interface

Product Brief for the CPC5902

CPC5902/5903 Evaluation Board User's Guide


  • Bidirectionally Buffers Both I2C Signals
  • Glitch-Free Operation
  • Extends and Isolates I2C Interfaces
  • Standard-mode and Fast-mode I2C
    Side B Fast-mode I2C Compliant VDDB=4.5V-5.5V
  • Very Low EM and RF Generation - No Internal Clock
  • SMBus Compatible VDDB=3.3V
  • Operates on 2.7V to 5.5V, Enabling Level Translation
  • Slew-Limited Drivers Reduce EMI
  • Powerdown to Hi-Z Doesn't Load I2C
  • 3750Vrms Galvanic Isolation


  • Isolated Signal Monitoring and Control
  • Power-over-Ethernet
  • Power Supply High Side Interface
  • I2C Bus Length Extenders
  • I2C Logic Level Translation


Click here for Reliability Report for this device
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