Diodes Incorporated

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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.


  • 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.


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

Product Specifications

Product Parameters

Type Shunt regulator
Compliance (Only Automotive supports PPAP) Automotive
AEC Qualified Yes
ReferenceVoltage (V) 2.5 V
Tolerance (%) 1 %
Maximum Input Voltage (V) 20 V
Sink Current (mA) 100 mA
Minimum Cathode Current for Regulation Typ (µA) 400 µA
Typical Temperature Coefficient (ppm/°C) 34 ppm/°C
Maximum Slope Resistance (Ω) 0.5 Ω
Operating Ambient Temperature Range (°C) -40 to 125 °C

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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-2365 2018-10-04 2019-04-04 Device End of Life (EOL) – Automotive Parts