600V Isolated 2Tx/2Rx and 1Tx/1Rx RS-232 Transceiver with ±15kV ESD and Integrated Capacitors

Industry’s Smallest RS-232 Isolated Solution with Integrated Capacitors

Please check latest availability status for a specific part variant.


The MAX33250E and MAX33251E are isolated 2Tx/2Rx and 1Tx/1Rx RS-232 transceivers, respectively, with a galvanic isolation of 600VRMS (60sec) between the logic UART side and field side. The isolation barrier protects the logic UART side from electrical transient strikes from the field side. It also breaks ground loops and large differences in ground potentials between the two sides that can potentially corrupt the receiving and sending of data. The MAX33250E and MAX33251E conform to the EIA/TIA-232E standard and operate at data rates up to 1Mbps.

The isolated RS-232 transceivers have integrated charge pumps and an inverter to eliminate the need for a high positive and negative voltage supply. Both devices also have integrated charge pump and inverter capacitors to help further reduce PCB space. The supply pin VCCA on the UART logic side operates from a dual voltage supply from +3V to +5.5V. VCCB also operates from +3V to +5.5V, simplifying power requirements and enabling level translation between the two voltages. The transmitters and receivers on the field side of these devices are rated for ±15kV of ESD HBM protection, suitable for applications where RS-232 cables are frequently worked on.

Both are available in a 12-pin, 6mm x 6mm LGA package and operate over the -40°C to +85°C temperature range.

MAX33250E, MAX33251E:Simplified Block Diagram MAX33250E, MAX33251E: Simplified Block Diagram Enlarge+

Key Features

  • High Integration Saves Space and Simplifies Designs
    • Integrated Charge Pumps and Inverter Eliminates Extra Power Supplies
    • Four Internal Capacitors Saves PCB Space
    • Integrated Isolator Saves Up to 63% Versus a Discrete Solution
  • Integrated Protection for Robust Communications
    • 600VRMS Withstand Isolation Voltage for 60 Seconds (VISO)
    • 200VRMS Working Voltage for >50 years (VIOWM)
    • Integrated ±15kV ESD Human Body Model (HBM)


  • Communication Systems
  • Diagnostics Equipment
  • GPS Equipment
  • Industrial Equipment
  • Medical Equipment
  • POS Systems
Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExt. CapsESD Protect.
mintypSee Notes
MAX33250E 3 to 5.522100010Yes015600
$5.74 @1k
MAX33251E 11
See All RS-232 Line Driver/Receivers (136)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX33250ESHLD: Evaluation Kit for the MAX33250E
MAX33251ESHLD: Evaluation Kit for the MAX33251E

Quality and Environmental Data

Request Reliability Report for: MAX33250E 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX33250EELC+
  • 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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    IO-Link Transceiver with Integrated Protection

    • High Configurability and Integration Reduces SKU
    • Integrated Protection Enables Robust Systems
    • Optimized for Small Designs

    100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity

    • High-Speed Operation
    • Integrated Protection Increases Robustness
    • Flexibility for Many Different Applications

    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.