Diodes Incorporated

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1.24V adjustable 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.


  • 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
  • Application(s)

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

    Product Parameters

    Type Shunt regulator
    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    ReferenceVoltage (V) 1.24 V
    Tolerance (%) 2.5, 1 %
    Maximum Input Voltage (V) 10 V
    Sink Current (mA) 25 mA
    Minimum Cathode Current for Regulation Typ (µA) 30 µA
    Typical Temperature Coefficient (ppm/°C) 26 ppm/°C
    Maximum Slope Resistance (Ω) 2 Ω
    Operating Ambient Temperature Range (°C) -40 to 85 °C

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