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The AZ9431BQ 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 makes 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 AZ9431BQ precision reference is offered in two voltage tolerances: 1.0% respectively.

The AZ9431BQ are available SOT23 and have been qualified to AEC-Q100 Grade 1 and are Automotive-Compliant supporting PPAP documentation.


  • Body Control Module
  • Power Supplies
  • Automotive Interior


  • Wide Programmable Precise Output Voltage from 1.24V to 18V
  • Temperature range -40 to +125°C 
  • Reference Voltage Tolerance at +25°C: 1% AZ9431BQSA-7
  • High Stability under Capacitive Load
  • Low Temperature Deviation: 3mV Typical
  • Low Equivalent Full-range Temperature Coefficient: 20PPM/oC 
  • Low Dynamic Output Resistance: 0.05Ω Typical
  • High Sink Current Capacity from 0.1mA to 100mA
  • Low Output Noise
  • Wide Operating Range of -40 to +125 oC
  • Automotive Compliant
  • Qualified to AEC-Q100 Grade 1 
  • PPAP capable

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
Qualified to AEC-Q10x Yes
ReferenceVoltage (V) 1.24 V
Accuracy (%) 1 %
MaximumInput Voltage (V) 18 V
Sink Current (mA) 100 mA
Minimum Cathode Current for Regulation Typ (µA) 5.5 µA
Maximum Slope Resistance (Ω) 0.15 Ω
Operating Ambient Temperature Range (°C) -40 to 125 °C

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Technical Documents

Recommended Soldering Techniques


Our shunt voltage regulator portfolio includes 2.5V, 1.24V, and 0.6V reference voltage devices covering consumer, computing, industrial, and automotive applications.

It includes industry standard TL431 and TL432 equivalents, as well as footprint compatible, very low minimum (knee) current for latest low standby power isolated power supplies. Additionally, it includes a well enhanced operating voltage range TLV431 (1.24V) equivalents. All of the 2.5V and 1.24V support operating temperatures up to 125°C as standard, therefore reducing the number of variants that need to be qualified and stocked.

Automotive-compliant variants are available which are qualified to AEC-Q100 Grade 1 in IATF 16949 facilities supporting PPAP documentation.

Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Mouser Electronics Inc. 59 9/22/2021 South America, North America, Asia, Europe, Middle East Buy Now
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Product Change Notices

PCN # Issue Date Implementation Date Subject
PCN-2513 2021-03-08 2021-06-08 Additional Wafer Source GFAB - Automotive