Precision Adjustable (Programmable) Shunt Reference

Precision Adjustable (Programmable) Shunt Reference - TL1431

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The TL1431 device is a precision programmable reference with specified thermal stability over automotive, commercial, and military temperature ranges. The output voltage can be set to any value between VI(ref) (approximately 2.5 V) and 36 V with two external resistors. This device has a typical output impedance of 0.2 Ω. Active output circuitry provides a sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies.

The TL1431C is characterized for operation over the commercial temperature range of 0°C to 70°C. The TL1431Q is characterized for operation over the full automotive temperature range of –40°C to 125°C. The TL1431M is characterized for operation over the full military temperature range of –55°C to 125°C.


  • 0.4% Initial Voltage Tolerance
  • 0.2-Ω Typical Output Impedance
  • Fast Turnon (500 ns)
  • Sink Current Capability (1 mA to 100 mA)
  • Low Reference Current (REF)
  • Adjustable Output Voltage (VI(ref) to 36 V)

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Parametrics Compare all products in Shunt Voltage Reference

Reference Voltage
VO (V)
VO Adj (Min) (V)
VO Adj (Max) (V)
Initial Accuracy (Max) (%)
Temp Coeff (Max) (ppm/ degree C)
Operating Temperature Range (C)
Iz for Regulation (Min) (uA)
Iout/Iz (Max) (mA)
Package Group
TL1431 TL1431-EP TL1431-Q1 TL1431-SP
Adjustable    Adjustable    Adjustable    Adjustable   
N/A      N/A     
2.5    2.5    2.5    2.5   
36    36    36    36   
0.4    0.4    0.4    0.4   
114    114    114    114   
Catalog    HiRel Enhanced Product    Automotive    Space   
-40 to 125
0 to 70   
-40 to 125
-55 to 125   
-40 to 125    -55 to 125   
450    450    450    450   
150    100    100    100   

Other qualified versions of TL1431

Version Part Number Definition
Enhanced Product TL1431-EP Supports Defense, Aerospace and Medical Applications
Military TL1431M QML certified for Military and Defense Applications
Automotive TL1431-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
Space TL1431-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

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