Diodes Incorporated

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The ZR431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 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.


  • Surface mount SOT223 and SOT23 packages
  • TO92 package
  • 2%, 1 % and 0.5% tolerance
  • Max. temperature coefficient 55 ppm/°C
  • Temperature compensated for operation over the full temperature range
  • Programmable output voltage
  • 50μA to 100mA current sink capability
  • Low output noise
  • Application(s)

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

    Product Parameters

    Type Shunt regulator
    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    ReferenceVoltage (V) 2.5 V
    Tolerance (%) 2, 1, 0.5 %
    Maximum Input Voltage (V) 20 V
    Sink Current (mA) 100 mA
    Minimum Cathode Current for Regulation Typ (µA) 50 µA
    Typical Temperature Coefficient (ppm/°C) 26 ppm/°C
    Maximum Slope Resistance (Ω) 0.75 Ω
    Operating Ambient Temperature Range (°C) -40 to 85 °C

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    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2642 2023-09-05 2024-03-05 Device End of Life (EOL)