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Shunt voltage references

TLV431

ACTIVE

1.5% accuracy, low-voltage, adjustable precision shunt regulator

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Data sheet
1.5% accuracy, low-voltage, adjustable precision shunt regulator

TLV431

ACTIVE
Data sheet Order now

Product details

VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1.5 VO adj (Min) (V) 1.24 VO adj (Max) (V) 6 Iz for regulation (Min) (uA) 55 Rating Catalog Temp coeff (Max) (ppm/ degree C) 138 Operating temperature range (C) -40 to 125, -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 15
VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1.5 VO adj (Min) (V) 1.24 VO adj (Max) (V) 6 Iz for regulation (Min) (uA) 55 Rating Catalog Temp coeff (Max) (ppm/ degree C) 138 Operating temperature range (C) -40 to 125, -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 15
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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 TO-92 (LP) 3 19 mm² 5.2 x 3.68
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  • Low-Voltage Operation, VREF = 1.24 V
  • Adjustable Output Voltage, VO = VREF to 6 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical Temperature Drift
    • 4 mV (0°C to 70°C)
    • 6 mV (–40°C to 85°C)
    • 11 mV (–40°C to 125°C)
  • Low Operational Cathode Current, 80 µA Typical
  • 0.25-Ω Typical Output Impedance
  • Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24 V to 18 V) and IK (80 mA)
    • Additional SOT-89 Package
    • Multiple Pinouts for SOT-23-3 and SOT-89 Packages
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters.
  • Low-Voltage Operation, VREF = 1.24 V
  • Adjustable Output Voltage, VO = VREF to 6 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical Temperature Drift
    • 4 mV (0°C to 70°C)
    • 6 mV (–40°C to 85°C)
    • 11 mV (–40°C to 125°C)
  • Low Operational Cathode Current, 80 µA Typical
  • 0.25-Ω Typical Output Impedance
  • Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24 V to 18 V) and IK (80 mA)
    • Additional SOT-89 Package
    • Multiple Pinouts for SOT-23-3 and SOT-89 Packages
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters.
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The TLV431 device is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24 V) and 6 V with two external resistors (see the Parameter Measurement Information section). These devices operate from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLV431 device is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turnon characteristic, making them excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

The TLV431 device is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24 V) and 6 V with two external resistors (see the Parameter Measurement Information section). These devices operate from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLV431 device is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turnon characteristic, making them excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

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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

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Type Title Date
* Data sheet TLV431x Low-Voltage Adjustable Precision Shunt Regulator datasheet (Rev. X) 01 May 2018
Application note Voltage Reference Design Tips For ADC Pairing (Rev. A) 02 Jun 2021
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
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
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note High-side current sources for industrial applications 12 Mar 2019
Application note Window comparator circuit (Rev. A) 06 Feb 2019
White paper Voltage reference selection basics white paper (Rev. A) 23 Oct 2018
Application note Low Cost Bidirectional Current Sensing Using INA181 28 Jul 2017
Technical article Digitally select your reference voltage 27 Apr 2016
Technical article Understanding Voltage References: Using a Shunt Reference as a Comparator 12 May 2015
Application note Designing Overcurrent protection for TPL7407L Peripheral Driver 05 Nov 2014
Application note Low-cost flyback solutions for 10-mW standby power 22 Jan 2014
Technical article Power Tips: How to Regulate a Low-Voltage, Isolated Supply 16 Jan 2014
Application note Supplying TPS61200 With a Single Solar Cell (Rev. B) 06 Sep 2011
Application note Setting the shunt voltage on an adjustable shunt regulator 01 Sep 2011
Application note Implementing a Buck Converter With the TPS23753A 20 Sep 2010
User guide Low Cost Isolated Power Supply for PoE Applications 20 May 2003
User guide 10-Watt Flyback Converter Utilizing the UCC3809 (Rev. B) 14 Sep 2001

Design & development

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

Evaluation board

PSEMTHR24EVM-081 — Mother board for 24-port IEEE 802.3bt ready PSE system

PSEMTHR24EVM-081 is the base board for the TPS23881 and TPS23882 PSE controllers. This board contains 24 2-Pair / 4-Pair ports that can that can be used to send up to 30W/port for IEEE 802.3at applications and up to 90W/port for IEEE 802.3bt applications.

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Simulation model

TLV431 Family Unencrypted PSpice Transient and AC Model (Rev. A)

SLIM005A.ZIP (161 KB) - PSpice Model
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Simulation model

TLV431 Family TINA-TI Transient and AC Spice Model

SLVM088.ZIP (3 KB) - TINA-TI Spice Model
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Simulation model

TLV431 Family TINA-TI Transient Reference Design

SLVM089.TSC (45 KB) - TINA-TI Reference Design
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Simulation model

TLV431 Family TINA-TI AC Reference Design

SLVM090.TSC (80 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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Many TI reference designs include the TLV431

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SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options
SOT-89 (PK) 3 View options
TO-92 (LP) 3 View options

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