Diodes Incorporated

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The AS431H 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 the AS431H an ideal substitute for Zener diodes in applications such as switching power supplies, chargers, and other adjustable regulators.

The output voltage of the AS431H can be set to any value between VREF (2.495V) and the corresponding maximum cathode voltage (36V).

The AS431H precision reference is offered in two voltage tolerances: 0.5% and 1.0%.

This IC is available in two packages: TO92 (Ammo Packing) and SOT23.


  • Programmable Precise Output Voltage from 2.495V to 36V
  • High Stability under Capacitive Load
  • Low Temperature Deviation: 5mV Typical
  • Low Equivalent Full-range Temperature Coefficient with 20PPM/°C Typical
  • Sink Current Capacity from 0.5mA to 100mA
  • Low Output Noise
  • Wide Operating Range of -40 to +125°C
  • Lead-Free Packages, Available in “Green” Molding Compound: SOT23, TO92 (Ammo Packing)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Chargers
  • Voltage adapters
  • Switching power supplies
  • Graphic cards
  • Precision voltage references

Product Specifications

Product Parameters

Type Shunt regulator
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
ReferenceVoltage (V) 2.495 V
Tolerance (%) 0.5, 1 %
Maximum Input Voltage (V) 40 V
Sink Current (mA) 100 mA
Minimum Cathode Current for Regulation Typ (µA) 350 µA
Typical Temperature Coefficient (ppm/°C) 12 ppm/°C
Maximum Slope Resistance (Ω) 0.5 Ω
Operating Ambient Temperature Range (°C) -40 to 125 °C

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Technical Documents

Recommended Soldering Techniques


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