(ACTIVE) Adjustable Precision Zener Shunt Regulator


Functional diagram

Typical Application

Typical Performance


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.


  • 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


Reference Voltage Adjustable   
VO (V) 2.5   
VO Adj (Min) (V) 2.5   
VO Adj (Max) (V) 36   
Initial Accuracy (Max) (%) 0.5^1^2   
Temp Coeff (Max) (ppm/ degree C) 97   
Rating Catalog   
Operating Temperature Range (C) -40 to 85^0 to 70   
Min Iz for Regulation (uA) 400   
Iout/Iz (Max) (mA) 100   
Package Group TO-92^SOIC^SOT-23   
Approx. Price (US$) 0.18 | 1ku   

Companion Products

Technical Documents

Datasheet (1)

Application notes (1)

Selection guides (1)

Solution guides (2)

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