Diodes Incorporated

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1.24V shunt regulator

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The ZTLV431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 20mA. The output voltage may be set to any chosen voltage between 1.24 volts and 10 volts by selection of two external divider resistors. The ZTLV431 can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. The ZTLV431 is available as standard as an A grade which has an initial tolerance of 1% and covers the -40°C to 125°C temperature range as standard.


  • Low voltage operation VREF = 1.24V
  • Temperature range -40 to 125°C
  • Reference voltage tolerance at 25°C
  • 1% ZTLV431A
  • Typical temperature drift
  • 4 mV (0°C to 70°C)
  • 6 mV (-40°C to 85°C)
  • 11mV (-40°C to 125°C)
  • 100μA minimum cathode current
  • 0.25Ω typical output impedance
  • Adjustable output voltage 1.24V to 10V
  • Application(s)

  • Opto-coupler linearization
  • Linear regulators
  • Improved Zener
  • Variable reference
  • Product Specifications

    Product Parameters

    Type Shunt regulator
    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    ReferenceVoltage (V) 1.24 V
    Tolerance (%) 1 %
    Maximum Input Voltage (V) 10 V
    Sink Current (mA) 15 mA
    Minimum Cathode Current for Regulation Typ (µA) 55 µA
    Typical Temperature Coefficient (ppm/°C) 55 ppm/°C
    Maximum Slope Resistance (Ω) 0.4 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-2642 2023-09-05 2024-03-05 Device End of Life (EOL)