Enhanced Product Precision Adjustable (Programmable) Shunt Reference

Enhanced Product Precision Adjustable (Programmable) Shunt Reference - TL1431-EP


The TL1431-EP device is a precision-programmable reference with specified thermal stability over the military temperature range. The output voltage can be set to any value from VI(ref) (approximately 2.5 V) to 36 V with two external resistors (see ). 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.


  • 0.4% Initial Voltage Tolerance
  • 0.2-Ω Typical Output Impedance
  • Fast Turnon: 500 ns
  • Sink Current Capability: 1 to 100 mA
  • Low Reference Current (REF)
  • Adjustable Output Voltage: VI(ref) to 36 V
  • Supports Defense, Aerospace, and Medical Applications
    • Controlled Baseline
    • One Assembly and Test Site
    • One Fabrication Site
    • Available in Military (–55°C to 125°C)
      Temperature Range
    • Extended Product Life Cycle
    • Extended Product-Change Notification
    • Product Traceability

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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)
Iz for Regulation (Min) (uA)
Temp Coeff (Typ) (ppm/ degree C)
TL1431-EP TL1431 TL1431-Q1 TL1431-SP
2.5        2.475   
36        36   
  N/A    N/A     
0.4    0.4    0.4    0.4   
114    114    114    114   
HiRel Enhanced Product    Catalog    Automotive    Space   
-40 to 125
-55 to 125   
-40 to 125
0 to 70   
-40 to 125    -55 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-EP

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