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1.24V adjustable Precision Shunt Regulator

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The ZR431L is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 25mA. The output voltage may be set to any chosen voltage between 1.24 and 10 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. The ZR431L is particularly used in the feedback control loop of switch mode power supplies. In this application the device 1.24 volt reference enables the generation of low voltage supplies, typically 3.3 volts or 3 volts.


  • Switch mode power supplies
  • Shunt regulator
  • Series regulator
  • Voltage monitor
  • Over voltage / under voltage protection


  • 2.5% and 1% tolerance
  • Max. temperature coefficient 50 ppm/°C
  • Temperature compensated for operation over -40 to 85°C
  • 100mA to 25mA current sink capability
  • Surface mount SOT23 package
  • Product Specifications

    Product Parameters

    Compliance (Only Automotive supports PPAP) Standard
    Qualified to AEC-Q10x No
    ReferenceVoltage (V) 1.24 V
    Accuracy (%) 2.5, 1 %
    MaximumInput Voltage (V) 10 V
    Sink Current (mA) 25 mA
    Minimum Cathode Current for Regulation Typ (µA) - µA
    Maximum Slope Resistance (Ω) 2 Ω
    Operating Ambient Temperature Range (°C) -40 to 85 °C

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    SPICE Model

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    Our shunt voltage regulator portfolio includes 2.5V, 1.24V, and 0.6V reference voltage devices covering consumer, computing, industrial, and automotive applications.

    It includes industry standard TL431 and TL432 equivalents, as well as footprint compatible, very low minimum (knee) current for latest low standby power isolated power supplies. Additionally, it includes a well enhanced operating voltage range TLV431 (1.24V) equivalents. All of the 2.5V and 1.24V support operating temperatures up to 125°C as standard, therefore reducing the number of variants that need to be qualified and stocked.

    Automotive-compliant variants are available which are qualified to AEC-Q100 Grade 1 in IATF 16949 facilities supporting PPAP documentation.

    Orderable Part Number Buy from Distributor / Contact Sales Request Samples


    Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
    Farnell, An Avnet Company 1666 9/17/2021 England Buy Now
    Farnell, An Avnet Company 1666 9/17/2021 England Buy Now
    Request Sample


    Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
    Arrow Electronics 548 9/19/2021 United States Buy Now
    Digi-Key Electronics 2813 9/19/2021 Europe, Asia, North America Buy Now
    Mouser Electronics Inc. 3302 9/19/2021 South America, North America, Asia, Europe, Middle East Buy Now
    RS Components 10550 9/19/2021 England Buy Now
    Micronetics GmbH 2700 9/13/2021 Germany Contact Sales
    Request Sample


    Product Change Notices

    PCN # Issue Date Implementation Date Subject
    PCN-2427 2019-10-15 2020-04-15 Device End of Life (EOL)
    PCN-2381 2018-10-25 2019-01-25 Qualification of Additional FAB & A/T Source, and/or Bill of Materials (BOM) for Select Products