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Optically Isolated I2C Bus Repeater
One Bidirectional Channel
One Unidirectional Channel

Our Optically Isolated I2C Bus Repeaters are the industry's first integrated optical solutions for I2C bus design that:

  • Minimizes PC board space usage
  • Reduce 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 CPC5903 features excellent reliability and very long operational life. Contact the factory for available reliability data.


CPC5903 Block Diagram

Data Sheet for CPC5903 (Rev 3)

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

Product Brief for the CPC5903

CPC5902/5903 Evaluation Board User's Guide


  • Bidirectionally Buffers I2C SDA Signal
  • Unidirectionally Buffers I2C SCL Signal
  • 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 Does Not 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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