TL1431-Q1 (ACTIVE)

Automotive Catalog Precision Adjustable (Programmable) Shunt Reference

Automotive Catalog Precision Adjustable (Programmable) Shunt Reference - TL1431-Q1


The TL1431 is a precision programmable reference with specified thermal stability over the automotive temperature range. The output voltage can be set to any value between VI(ref) (approximately 2.5 V) and 36 V with two external resistors (see Figure 16). 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 TL1431Q is characterized for operation over the full automotive temperature range of –40°C to 125°C.


  • Qualified for Automotive Applications
  • 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-Q1 TL1431 TL1431-EP 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   
Automotive    Catalog    HiRel Enhanced Product    Space   
-40 to 125    -40 to 125
0 to 70   
-40 to 125
-55 to 125   
-55 to 125   
450    450    450    450   
100    150    100    100   

Other qualified versions of TL1431-Q1

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
Space TL1431-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application