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Shunt voltage references

TL431

ACTIVE

Adjustable precision shunt regulator

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Data sheet

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ATL431LI ACTIVE Low-IQ programmable shunt regulator offered in an ultra-small DQN package Pin-to-pin functionality which offers improved stability boundaries, lower regulation current and also available in smaller packages.
TL431LI ACTIVE Adjustable precision shunt regulator with optimized reference current (pin layout: KRA) Pin-to-pin option with improved stability boundaries and lower reference input current to optimize voltage output accuracy.
Adjustable precision shunt regulator

TL431

ACTIVE
Data sheet Order now

Product details

VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1, 2 VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Rating Catalog Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125, -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 100
VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1, 2 VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Rating Catalog Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125, -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 100
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PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 3.91 x 4.9 SOP (PS) 8 48 mm² 6.2 x 7.8 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 SOT-89 (PK) 3 18 mm² 4.5 x 4.095 SOT-SC70 (DCK) 6 4 mm² 2 x 2.1 TO-92 (LP) 3 19 mm² 5.2 x 3.68 TSSOP (PW) 8 19 mm² 3 x 6.4
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  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
    • 2% (Standard Grade)
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to 125°C
  • Typical Temperature Drift (TL43xB)
    • 6 mV (C Temp)
    • 14 mV (I Temp, Q Temp)
  • Low Output Noise
  • 0.2-Ω Typical Output Impedance
  • Sink-Current Capability: 1 mA to 100 mA
  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
    • 2% (Standard Grade)
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to 125°C
  • Typical Temperature Drift (TL43xB)
    • 6 mV (C Temp)
    • 14 mV (I Temp, Q Temp)
  • Low Output Noise
  • 0.2-Ω Typical Output Impedance
  • Sink-Current Capability: 1 mA to 100 mA
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The TL431LI / TL432LI are pin-to-pin alternatives to TL431 / TL432. TL43xLI offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.

The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.

The TL431LI / TL432LI are pin-to-pin alternatives to TL431 / TL432. TL43xLI offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.

The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet TL431 / TL432 Precision Programmable Reference datasheet (Rev. P) 14 Nov 2018
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Analog design journal High-power, low-cost, discrete linear pre-regulator for automotive rear lights 21 Dec 2020
Technical article Overcoming common design challenges in an UV sterilization box system 27 Jul 2020
Technical article How modern voltage references help shrink small designs 01 Jun 2020
Application note Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) 11 Dec 2019
Selection guide 431 Device Nomenclature (Rev. B) 18 Sep 2019
Application note Designing With the Improved TL431LI (Rev. A) 28 Jun 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
White paper Voltage reference selection basics white paper (Rev. A) 23 Oct 2018
Application note TL431 Pin FMEA 12 Jan 2018
Application note Low Cost Bidirectional Current Sensing Using INA181 28 Jul 2017
Technical article Differences between PSR and SSR in bias power-supply design 08 Apr 2016
Technical article The great compromise: voltage references 07 Dec 2015
Application note Designing Overcurrent protection for TPL7407L Peripheral Driver 05 Nov 2014
Analog design journal Low-cost flyback solutions for 10-mW standby power 22 Jan 2014
Application note Understanding stability boundary conditions charts in TL431, TL432 Data sheet (Rev. A) 16 Jan 2014
Application note Lead-Acid Charger and LED Driver using TPS5402 (Rev. A) 13 Jun 2013
User guide 200-VA HF Inverter Design Based on UCD8220 and MSP430G2330 for Automotive Apps 07 Mar 2013
Application note Compensation Design with TL431 for UCC28600 16 Jan 2013
Application note Setting the shunt voltage on an adjustable shunt regulator 01 Sep 2011
User guide A 90-W High-Efficiency, LLC Series-Resonant Converter 03 Nov 2010
Analog design journal Q1 2009 Issue Analog Applications Journal 11 Mar 2009
Analog design journal Using a portable-power boost converter in an isolated flyback application 11 Mar 2009
Application note Designing Switching Voltage Regulators With the TL494 (Rev. E) 26 Jul 2005

Design & development

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

Evaluation board

ATL431EVM-001 — ATL431 adjustable shunt regulator evaluation module

The ATL431EVM-001 evaluation module (EVM) features the functionality and adjustability of the ATL431 by letting you program the cathode voltage with various resistor values. You can also set the cathode current using the various resistors in series with the supply (...)

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Simulation model

SPICE Model of TL431

SLOJ174.ZIP (0 KB) - Spice Model
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Simulation model

TL431 Family Unencrypted PSpice Transient and AC Model (Rev. B)

SLVM071B.ZIP (130 KB) - PSpice Model
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Simulation model

TL431x, TL432x TINA-TI Transient & AC Spice Model

SLVM163.ZIP (4 KB) - TINA-TI Spice Model
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Simulation model

TL431x, TL432x TINA-TI Transient Reference Design

SLVM164.TSC (82 KB) - TINA-TI Reference Design
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Simulation model

TL431x, TL432x TINA-TI AC Reference Design

SLVM165.TSC (65 KB) - TINA-TI Reference Design
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Calculation tool

TL431CALC — TL431 component calculator

The TL431CALC spreadsheet calculates all component parameters for any desired output voltage for the TL43x, TLV43x and TL1431. The spreadsheet includes limits for each device. Resistor values are calculated to the nearest 1% value.
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Calculation tool

TL431 Design Calculator

SLVC093.ZIP (58 KB)
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Many TI reference designs include the TL431

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PDIP (P) 8 View options
SC70 (DCK) 6 View options
SO (PS) 8 View options
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options
SOT-89 (PK) 3 View options
TO-92 (LP) 3 View options
TSSOP (PW) 8 View options

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