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Product details

Parameters

VO (V) 2.5 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1, 2 Rating Catalog VO adj (Min) (V) 2.5 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Temp coeff (Max) (ppm/ degree C) 97 Operating temperature range (C) -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 100 open-in-new Find other Shunt voltage references

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Shunt voltage references

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
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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.

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Same functionality and pinout but is not an equivalent to the compared device:
TL431LI ACTIVE Adjustable precision shunt regulator with optimized reference current (pin layout: KRA) TL431LI offers lower 63 ppm/°C temperature drift and higher initial accuracy at 2.4 V0.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet LM431 Adjustable Precision Zener Shunt Regulator datasheet (Rev. H) Jan. 06, 2016
Selection guides 431 Device Nomenclature (Rev. B) Sep. 18, 2019
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
White papers Tips and tricks for designing with voltage references May 30, 2017
Application notes Low-cost flyback solutions for 10-mW standby power Jan. 22, 2014
Application notes AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) May 01, 2013
Application notes Precision Output Current Limiting Using Average Current Monitor Feature Jun. 21, 2011
Application notes TO-92 Packing Options / Ordering Instructions (Rev. A) Jun. 23, 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SNVMAB5A.ZIP (49 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
Shunt voltage reference external resistor quick-start calculator
SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)
Features
  • Case-specific tool to calculate external resistor value associated with shunt voltage reference
  • Input fields for: voltage reference, supply voltage, load current and Iq bound values
  • Real-time effects of input values on schematic
  • Quick indicators notifying user of valid and invalid outputs
  • Error messages (...)
CALCULATION TOOLS Download
SNVC184.ZIP (53 KB)

Reference designs

Many TI reference designs include the LM431 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBZ) 3 View options
TO-92 (LP) 3 View options

Ordering & quality

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