Diodes Incorporated

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AS431I (Not Recommended for new design)

NRND = Not Recommended for New Design

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The AS431I is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full operation range. It features sharp turn-on characteristics, low temperature coefficient and low output impedance, which make it ideal substitute for Zener diode in applications such as switching power supply, charger and other adjustable regulators. The output voltage of AS431I can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage (36V). The AS431I is offered in two grade initial voltage tolerance at 25°C, 0.5%, and 1%. This IC is available in 3 packages: TO-92 (bulk or ammo packing), SOT-23 and SOT-89.


  • Programmable Precise Output Voltage from 2.5V to 36V
  • High Stability Under Capacitive Load
  • Low Minimum Cathode Current for Regulation: 10μA (Typ), 50μA (Max.)
  • Low Temperature Deviation: 4.5mV Typical
  • Sink Current Capacity from 50Ω A to 100mA
  • Low Output Noise
  • Wide Operating Range: -40°C to 125°C


  • Charger
  • Voltage Adapter
  • Switching Power Supply
  • Graphic Card
  • Precision Voltage 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) 50
Operating Ambient Temperature Range (°C) -40 to 125
AEC Qualified No
ReferenceVoltage (V) 2.5
Sink Current (mA) 100

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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-2514 2021-03-09 2021-06-09 Additional Wafer Source JKFAB
PCN-2492 2020-11-04 2021-05-04 Device End of Life (EOL)