1Mbps, 1µA RS-232 Transmitters in SOT23-6

Industry's First RS-232 Transmitters in a SOT Package

Please check latest availability status for a specific part variant.


The MAX3188/MAX3189 single RS-232 transmitters in a SOT23-6 package are for space- and cost-constrained applications requiring minimal RS-232 communications. These devices consume only 150µA of supply current from ±4.5V to ±6V supplies. RS-232 data transmission is guaranteed up to 250kbps with the MAX3188 and up to 1Mbps with the MAX3189.

The MAX3188/MAX3189 transmitters are inverting level translators that convert CMOS-logic levels to 5V EIA/TIA-232 levels. They feature a shutdown input that reduces current consumption to only 1µA and forces the transmitter output into a high-impedance state. The MAX3188/MAX3189 transmitters have a standard inverting output.
MAX3188, MAX3189: Typical Operating Circuit MAX3188, MAX3189: Typical Operating Circuit Enlarge+

Key Features

  • Small 6-Pin SOT23 Package
  • 150µA Supply Current
  • Shutdown Reduces Supply Current to 1µA
  • Guaranteed Data Rate
    • 1Mbps (MAX3189)
    • 250kbps (MAX3188)
  • Three-State RS-232 Transmitter Output
  • No External Components Required


  • Diagnostic Ports
  • Digital Still Cameras
  • Handheld Equipment
  • Network Equipment
  • Set-Top Boxes
  • Telecommunications

Technical Documents

Tutorial 2141 Determining Clock Accuracy Requirements for UART Communications

Quality and Environmental Data

Request Reliability Report for: MAX3189 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3189EEUT+
  • MAX3189EEUT+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Environmental Management System >


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