Precision Adjustable (Programmable) Shunt Reference



The TL1431 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 very 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 TL1431 is characterized for operation over the full military temperature range of –55°C to 125°C.


  • QMLV Qualified to 100k Rad RHA,
    SMD 5962R99620
  • 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 Voltage Reference Products

Vin (Min) (V)
Vin (Max) (V)
VO (V)
Initial Accuracy (Max) (%)
Temp Coeff (Max) (ppm/ degree C)
Operating Temperature Range (C)
Package Group
VO Adj (Max) (V)
VO Adj (Min) (V)
Min Iz for Regulation (uA)
Temp Coeff (Typ) (ppm/ degree C)
TL1431-SP TL1431 TL1431-EP TL1431-Q1
2.475      2.5     
36      36     
  N/A      N/A   
0.4    0.4    0.4    0.4   
114    114    114    114   
Space    Catalog    HiRel Enhanced Product    Automotive   
-55 to 125    -40 to 125
0 to 70   
-40 to 125
-55 to 125   
-40 to 125   
36    36    36    36   
2.5    2.5    2.5    2.5   
450    450    450    450   
23    23    23    23   

Other qualified versions of TL1431-SP

Version Part Number Definition
Catalog TL1431 TI's standard catalog product
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