LM431 2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator | TI.com

LM431 (ACTIVE)

2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator

 

Recommended alternative parts

  • TL431LI  -  Offers lower Iref & II(dev) for better performance
  • TLVH431  -  1.24-V adjustable voltage reference up to 18 V
  • LM4040  -  Offers fixed voltage options with lower IQ & higher accuracy as low as 0.1%

Description

The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5 V (VREF) up to 36 V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turnon characteristics this device is an excellent replacement for many Zener diode applications.

The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.

Features

  • Average Temperature Coefficient 50 ppm/°C
  • Temperature Compensated for Operation Over
    the Full Temperature Range
  • Programmable Output Voltage
  • Fast Turnon Response
  • Low-Output Noise
  • Low-Dynamic Output Impedance
  • Available in Space-Saving SOIC-8, SOT-23, and
    TO-92 Packages

View more

Parametrics Compare all products in Shunt voltage references

 
Reference voltage
VO (V)
VO adj (Min) (V)
VO adj (Max) (V)
Initial accuracy (Max) (%)
Temp Coeff (Max) (ppm/ degree C)
Rating
Operating temperature range (C)
Iz for regulation (Min) (uA)
Iout/Iz (Max) (mA)
Package Group
Iref (uA)
I I(dev) (uA)
LM431 LMV431 TL431LI
Adjustable     Adjustable     Adjustable    
2.5     1.24     2.495    
2.5     1.24     2.495    
36     30     36    
0.5
1
2    
1.5     0.5
1    
97     129
138    
63    
Catalog     Catalog     Catalog    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
400     80     400    
100     15     15    
SOIC | 8
SOT-23 | 3
TO-92 | 3    
SOT-23 | 5
TO-92 | 3    
SOT-23 | 3    
4     0.5     0.8    
1.2     0.4     0.4    

Design tool

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WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM431

  Min   Max Range
Vin  V 2.5 to 37.0V
Vout  V 2.5 to 36V
Iout  A ≤ 0.1A
Ambient Temp  °C -40 to 85°C