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.

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1.24V adjustable Shunt Regulator

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The AZ431L series ICs are low voltage three-terminal adjustable 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, motherboard and other adjustable regulators. The output voltage can be set to any value between 1.24V and 18V with two external resistors. The AZ431L precision reference is offered in two voltage tolerance: 0.5% and 1.0%. These ICs are available in 4 packages: TO-92 (bulk or ammo packing), SOT-23, SOT-23-5 and SOT-89.


  • Wide Programmable Precise Output Voltage from 1.24V to 18V
  • High Stability under Capacitive Load
  • Low Temperature Deviation: 3mV Typical
  • Low Equivalent Full-range Temperature Coefficient: 20PPM/°C Typical
  • Low Dynamic Output Resistance: 0.05Ω typical
  • High Sink Current Capacity from 0.1mA to 100mA
  • Low Output Noise
  • Wide Operating Range of -40°C to 125°C


  • Graphic Card
  • PC Motherboard
  • Voltage Adapter
  • Switching Power Supply
  • Charger

Product Specifications

Product Parameters

Type Shunt regulator
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
ReferenceVoltage (V) 1.24 V
Tolerance (%) 1, 0.5 %
Maximum Input Voltage (V) 18 V
Sink Current (mA) 100 mA
Minimum Cathode Current for Regulation Typ (µA) 55 µA
Typical Temperature Coefficient (ppm/°C) 20 ppm/°C
Maximum Slope Resistance (Ω) 0.15 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-2602 2023-01-31 2023-07-31 Device End of Life (EOL)
PCN-2492 2020-11-04 2021-05-04 Device End of Life (EOL)