Diodes Incorporated

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


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

Back to Voltage References - Automotive


Automotive-compliant 1.24V precision Shunt Regulator

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The TLV431Q 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 and 18 volts by selection of two external divider resistors.

The TLV431Q can be used as a replacement for Zener diodes in many applications requiring an improvement in Zener performance.

The TLV431Q is available in 3 tolerance bands with initial tolerances of 1%, 0.5%, and 0.2% for the A, B and T bands respectively.

The TLV431Q is qualified to AEC-Q100 Grade 1 and is automotive-compliant supporting PPAP documentation.


  • Low Voltage Operation, VREF = 1.24V
  • Temperature Range -40°C to +125°C
  • Reference Voltage Tolerance at +25°C
    • 2% TLV431TQ (End of Life, EOL)
    • 5% TLV431BQ
    • 1% TLV431AQ
  • Typical VREF Deviation Across Full Temperature Range (Note 1)
    • 4mV (0°C to +70°C)
    • 6mV (-40°C to +85°C)
    • 11mV (-40°C to +125°C)
  • 80µA Minimum Cathode Current
  • 25Ω Typical Output Impedance
  • Adjustable Output Voltage VREF to 18V
  • Totally Lead-Free & Fully RoHS Compliant (Notes 2 & 3)
  • Halogen and Antimony Free. “Green” Device (Note 4)
  • The TLV431Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Product Specifications

Product Parameters

Type Shunt regulator
Compliance (Only Automotive supports PPAP) Automotive
AEC Qualified Yes
ReferenceVoltage (V) 1.24 V
Tolerance (%) 1, 0.5, 0.2 %
Maximum Input Voltage (V) 18 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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