Diodes Incorporated

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Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

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TL431 (Not Recommended for new design)

NRND = Not Recommended for New Design

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The TL431 is 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 36 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. Diodes’ TL431 has the same electrical specifications as the industry standard ‘431 and is available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively.


  • Temperature range -40 to 125°C
  • Reference Voltage Tolerance at 25°C
  • TL431A: 2.495V ± 1.0%.
  • TL431B: 2.495V ± 0.5%
  • Low Output Noise
  • 0.2Ω Typical Output Impedance
  • Sink Current Capability: 1mA to 100mA
  • Adjustable Output Voltage: VREF to 36V
  • SOT23 and SOT25: Available in “Green” Molding Compound (No Br, Sb) and Lead Free Finish/ RoHS Compliant
  • Application(s)

  • Opto-Coupler Linearisation
  • Secondary side regulation
  • Shunt Regulators
  • Improved Zener
  • Variable Reference
  • Product Specifications

    Product Parameters

    Accuracy (%) 0.5, 1
    Compliance (Only Automotive supports PPAP) No
    MaximumInput Voltage (V) 36
    Maximum Slope Resistance (Ω) 0.5
    Minimum Cathode Current for Regulation Typ (µA) 400
    Operating Ambient Temperature Range (°C) -40 to 125
    AEC Qualified No
    ReferenceVoltage (V) 2.495
    Sink Current (mA) 100

    Related Content


    Technical Documents

    Recommended Soldering Techniques


    RoHS CofC

    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-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site