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The ZTL431AQ, ZTL431BQ, ZTL432AQ, and ZTL432BQ are three terminal adjustable shunt regulators that offer excellent temperature stability and output current handling capability up to 100mA. The output voltage can be set to any chosen voltage between 2.5V and 20V by the selection of two external divider resistors. The ZTL432AQ, ZTL432BQ has the same electrical specifications as the ZTL431AQ, ZTL431BQ but has a different pin out in SOT23 (F-suffix). The ZTL431AQ, ZTL431BQ, ZTL432AQ, and ZTL432BQ are available in two grades with initial tolerances of 1% and 0.5% for the A and B grades respectively. These devices are functionally equivalent to the TL431/TL432 except for maximum operation voltage, and they have an ambient temperature range of -40°C to +125°C as standard.


  • Opto-Coupler Linearization
  • Linear Regulators
  • Improved Zener
  • Variable Reference


  • Temperature Range: -40°C to +125°C
  • Reference Voltage Tolerance at +25°C
  • 0.5%: B Grade
  • 1%: A Grade
  • 0.2Ω Typical Output Impedance
  • Sink Current Capability: 1mA to 100mA
  • Adjustable Output Voltage: VREF to 20V
  • Green Molding in SOT23 and SOT25
  • Totally Lead-Free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device 
  • The ZTL431AQ, ZTL431BQ, ZTL432AQ and ZTL432BQ are suitable for automotive applications requiring specific change control and are AEC-Q100 qualified, have a grade 1 temperature rating, are PPAP capable, and are manufactured in IATF16949:2016 certified facilities.

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
Qualified to AEC-Q10x Yes
ReferenceVoltage (V) 2.5 V
Accuracy (%) 1 %
MaximumInput Voltage (V) 20 V
Sink Current (mA) 100 mA
Minimum Cathode Current for Regulation Typ (µA) 400 µA
Maximum Slope Resistance (Ω) 0.5 Ω
Operating Ambient Temperature Range (°C) -40 to 125 °C

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Technical Documents

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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
Avnet EU 3000 9/19/2021 Germany Buy Now
Mouser Electronics Inc. 69 9/19/2021 South America, North America, Asia, Europe, Middle East Buy Now
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