Precision Adjustable (Programmable) Shunt Reference - TL1431

TL1431 (ACTIVE)

Precision Adjustable (Programmable) Shunt Reference

Recommended alternative parts

  • ATL431  -  30X lower Ik (35uA max), as well as improved stability.
  • TLV431  -  Vout (12V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, Vref=1.24, 2% trim accuracy.
  • TLVH431  -  Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.
  • LM4040A25  -  Similar functionality with lower operating current.

Description

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 (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.

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.

Features

  • 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 Adj (Min) (V)
VO Adj (Max) (V)
Initial Accuracy (Max) (%)
Min Iz for Regulation (uA)
Iout/Iz (Max) (mA)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
TL1431 TL1431-EP TL1431-Q1 TL1431-SP
Adjustable     Adjustable     Adjustable     Adjustable    
2.5     2.5     2.5     2.5    
36     36     36     36    
0.4     0.4     0.4     0.4    
450     450     450     450    
150     100     100     100    
Catalog     HiRel Enhanced Product     Automotive     Space    
0 to 70
-40 to 125    
-40 to 125
-55 to 125    
-40 to 125     -55 to 125    
3TO-92
8SOIC
8TSSOP    
8SOIC     8SOIC     10CFP
8CDIP    
0.09 | 1ku       0.47 | 1ku      

Other qualified versions of TL1431

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

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