Diodes Incorporated

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ZTL431 (Not Recommended for new design)

NRND = Not Recommended for New Design

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The ZTL431 and ZTL432 are three terminal adjustable shunt regulators offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors.


  • Temperature range ................ -40 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


  • Opto-coupler linearization
  • Linear regulators
  • Improved zener
  • Variable reference

Product Specifications

Product Parameters

Accuracy (%) 0.5, 1
Compliance (Only Automotive supports PPAP) No
MaximumInput Voltage (V) 20
Maximum Slope Resistance (Ω) 0.5
Minimum Cathode Current for Regulation Typ (µA) 400
Operating Ambient Temperature Range (°C) -40 to 125
AEC Qualified No
ReferenceVoltage (V) 2.5
Sink Current (mA) 100

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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-2519 2021-05-20 2021-11-20 Device End of Life (EOL)
PCN-2505 2021-01-26 2021-07-26 Device End of Life (EOL)