Diodes Incorporated

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The AZ9431Q series are three-terminal adjustable shunt 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 automotive and high-reliability applications requiring an improvement in zener performance. The output voltage can be set to any value between 1.24V and 18V with two external resistors. The AZ9431Q precision reference is offered in 0.5% and 1.0% voltage tolerance. The AZ9431Q are available in SOT23 that are qualified to AEC-Q100 standards for high reliability and are PPAP capable.


  • Wide Programmable Precise Output Voltage from 1.24V to 18V
  • Temperature Range -40°C to +125°C
  • Reference Voltage Tolerance at +25°C
  • 0.5% AZ9431AQSA-7
  • 1% AZ9431BQSA-7
  • High Stability Under Capacitive Load
  • Low Temperature Deviation: 3mV Typical
  • Low Equivalent Full-Range Temperature Coefficient: 20PPM/°C
  • 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
  • Green Molding
  • Totally Lead-Free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device
  • The AZ9431Q series are suitable for automotive applications
    requiring specific change control; these parts are AEC-Q100
    qualified, PPAP capable, and manufactured in IATF 16949
    certified facilities.

Product Specifications

Product Parameters

Type Shunt reference
Compliance (Only Automotive supports PPAP) Automotive
AEC Qualified Yes
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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