Diodes Incorporated

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The AN431 series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The output voltage of these ICs can be set to any value between VREF (2.5V) and the maximum cathode voltage (36V). The AN431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%.


  • Programmable Precise Output Voltage from 2.5V to 36V
  • High Stability under Capacitive Load
  • Low Temperature Deviation: 4.5mV Typical
  • Low Equivalent Full-range Temperature Coefficient with 20PPM/oC Typical
  • Low Dynamic Output Resistance: 0.15Ω typical
  • Sink Current Capacity from 1mA to 100mA
  • Low Output Noise
  • Wide Operating Range of -40 to +125°C
  • Application(s)

  • Charger
  • Voltage Adapter
  • Switching Power Supply
  • Graphic Card
  • Precision Voltage Reference
  • Product Specifications

    Product Parameters

    Type Shunt regulator
    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    ReferenceVoltage (V) 2.5 V
    Tolerance (%) 0.5, 1 %
    Maximum Input Voltage (V) 36 V
    Sink Current (mA) 100 mA
    Minimum Cathode Current for Regulation Typ (µA) 400 µA
    Typical Temperature Coefficient (ppm/°C) 11 ppm/°C
    Maximum Slope Resistance (Ω) 0.5 Ω
    Operating Ambient Temperature Range (°C) -40 to 125 °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-2654 2024-02-15 2024-04-28 Device End of Life (EOL)
    PCN-2514 2021-03-09 2021-06-09 Additional Wafer Source JKFAB