Top

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
open-in-new Find other Shunt voltage references

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.

open-in-new Find other Shunt voltage references
Download
Similar products you might be interested in
open-in-new Compare products
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) Offers lower Iref & II(dev) for better performance
TLVH431 ACTIVE 1.5% low-voltage wide-operating current adjustable precision shunt regulator 1.24-V adjustable voltage reference up to 18 V
Similar but not functionally equivalent to the compared device:
LM4040 ACTIVE Fixed voltage, 45-µA, precision micropower shunt voltage reference Offers fixed voltage options with lower IQ & higher accuracy as low as 0.1%

Technical documentation

= Featured
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
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
More literature 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
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 (...)

Reference designs

REFERENCE DESIGNS Download
10kW 3-Phase 3-Level Grid Tie Inverter Reference Design for Solar String Inverter
TIDA-01606 — This verified reference design provides an overview on how to implement a three-level three-phase SiC based DC:AC grid-tie inverter stage.Higher switching frequency of 50KHz reduces the size of magnetics for the filter design and enables higher power density. The use of SiC MOSFETs with switching (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Three-level, three-phase SiC AC-to-DC converter reference design
TIDA-010039 This reference design provides an overview on how to implement a three-level, three-phase, SiC-based AC/DC converter with bi-directional functionality. A high switching frequency of 50 kHz reduces the size of magnetics for the filter design and as a result a higher power density. SiC MOSFETs with (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated 53V/400mA Output Flyback Solution Reference Design Featuring the LM3481
PMP10723 — PMP10723 is an isolated output flyback solution that accepts an input voltage of 9 VIN to 16 VIN and provides a 53-V/400-mA output. With secondary control, it can achieve great load regulation performance. Also it can fan out to cover other isolated high-voltage applications just by changing the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
400V Input, 50W Output Multiple-Output Bias Supply Reference Design
PMP20396 — PMP20396 is a multiple-output isolated bias supply reference design. With 100V or above input voltage, this design can provide maximum 2W output power. With 300V or above input voltage, this design can provide maximum 50W output power. Four different outputs are provided in this design - 5V/500mA (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
97% efficiency, 125W, Wide input Synchronous 4-Switch Buck-Boost Battery Charger Reference Design
PMP10594 — PMP10594 is a synchronous 4-switch buck-boost converter reference design which utilizes the LM5175 controller for battery charger applications. The output voltage set point can be adjusted by a PWM signal over the range of 7.1V to 9.2V. I2C programming allows independent control of the average (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Multiport Isolated Output Flyback Solution Reference Design Featuring the LM3481
PMP10725 — PMP10725 is an isolated flyback solution which accepts an input voltage of 15 to 36VIN and provides multiport output to the load. This reference design compares primary and secondary control solutions. With primary control, it can achieve higher efficiency with lower BOM cost, but the regulation (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Flyback Reference Design with High Line AC Input and 5V, 12V Dual-Output
PMP20001 — The PMP11405 reference design uses the UCC28740 constant current (CC), constant voltage (CV) flyback controller for a 5V/1A, 12V/0.9A bias supply with high line AC input (185VAC to 260VAC input). With safety isolated, Over 80% efficiency is achieved at full load and less than 400mW power consumption (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inverting Buck-Boost Reference Design Featuring LMR16020 DC/DC Buck Converter
PMP15012 — The PMP15012 reference design is a DC/DC buck-boost solution which accepts an input voltage of 18V to 36V and provides negative 15V/200mA output to the load. This reference design adds an external UVLO circuit to narrow the UVLO hysteresis because a buck-boost converter is difficult to shut down (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Eff 2Stage Univ Input Pwr Supply Using Trans Mode PFC/LLC Resonant Conv Reference Design
PMP8920 — Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8920 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. In addition, synchronous (...)
REFERENCE DESIGNS Download
4.5V to 24V Wide Input, Negative 5V/2A Output Non-synchronous Converter Reference Design
PMP10680 The PMP10680 reference design is a non-sync buck converter with buck-boost configuration. The PMP10680 accepts an input voltage of 4.5 to 24Vin and provides a negative 5V output capable of supplying continuous 2A of current to the load. With negative output and the self-positive input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
250W Single Stage LLC-SRC Converter Reference Design
PMP9739 The PMP9739 is a single stage LLC series resonant converter (SRC), producing up to a 250W output using UCC25600 resonant controller. With the use of single stage LLC-SRC, the converter efficiency goes up to 89% at 250W full output power.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
100-240VAC Input, 60W, 2-string, PWM Dimmable LED Driver Reference Design
PMP6024 PMP6024 is an offline, LED driver circuit consisting of an isolated, power-factor corrected, constant output voltage flyback converter followed by two DC/DC buck LED current controllers.  It is suitable for indoor or outdoor area lighting applications of 3500-5000 lumens (depending upon LED (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Eff 2Stage Univ Input Power Supply-Transition Mode PFC LLC Resonant Conv Reference Design
PMP8911 — Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8911 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. Low EMI is expected with (...)
REFERENCE DESIGNS Download
High Efficiency Synchronous Flyback with 36-72Vin to 5Vout@2A Reference Design
PMP8917 — PMP8917 has been designed as a competitive open-frame alternative for the communications market with 36-72Vin to 5V/2A. The product is supplied in the industry standard footprint of 2.0 x 1.0 x 0.394 inches. PMP8917 has a basic insulation system from input to output making it suitable for a wide (...)

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

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Voltage Reference Use Cases

Beyond the scope of signal chain conditioning, see other voltage reference use cases in this informative video.

Posted: 07-Jan-2018
Duration: 05:53

Related videos