Diodes Incorporated
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LA431 (Not Recommended for new design)

NRND = Not Recommended for New Design


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The LA431 is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between 2.495V (VREF) to 36V with two external resistors (please refer application circuit). The high precise Reference voltage tolerance is available in two grades: ±0.4% and ±1.0%. This device has a typical minimum cathode current of 0.1 mA. Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications.


  • Precision reference voltage :
    • LA431O : 2.495V±0.4%
    • LA431N : 2.495V±1.0%
  • Adjustable output voltage is VREF to 36V
  • Sink current capability is 120mA
  • Low dynamic output impedance is 0.2Ω (typ.)
  • Minimum Cathode current for regulation is 0.1mA (typ.)
  • Plastic material has UL flammability classification 94V-0


  • Switching Mode Power Supply
  • Voltage Reference Application

Product Specifications

Product Parameters

Accuracy (%) 0.4,1
Compliance (Only Automotive supports PPAP) Standard
MaximumInput Voltage (V) 36
Maximum Input Voltage (V) 36
Maximum Slope Resistance (Ω) 0.5
Minimum Cathode Current for Regulation Typ (µA) 300
Operating Ambient Temperature Range (°C) -40 to 125
Operating Ambient Temperature Range (°C) -40 to 125
AEC Qualified No
ReferenceVoltage (V) 2.495
Sink Current (mA) 100
Tolerance (%) 0.4,1
Type Shunt regulator
Typical Temperature Coefficient (ppm/°C) 61

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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-2594 2022-08-31 2023-02-28 Device End of Life (EOL)