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Product details

Parameters

VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1.5 Rating Catalog VO adj (Min) (V) 1.24 VO adj (Max) (V) 6 Iz for regulation (Min) (uA) 55 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 open-in-new Find other Shunt voltage references

Package | Pins | Size

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 open-in-new Find other Shunt voltage references

Features

  • 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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Description

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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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
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Type Title Date
* Datasheet TLV431x Low-Voltage Adjustable Precision Shunt Regulator datasheet (Rev. X) May 01, 2018
Application note Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) Dec. 11, 2019
Application note Voltage Reference Design Tips For ADC Pairing Nov. 05, 2019
Selection guide 431 Device Nomenclature (Rev. B) Sep. 18, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application note High-side current sources for industrial applications Mar. 12, 2019
Application note Window comparator circuit (Rev. A) Feb. 06, 2019
White paper Voltage reference selection basics white paper (Rev. A) Oct. 23, 2018
Application note Low Cost Bidirectional Current Sensing Using INA181 Jul. 28, 2017
E-book Tips and tricks for designing with voltage references May 30, 2017
Technical articles Digitally select your reference voltage Apr. 27, 2016
Technical articles Understanding Voltage References: Using a Shunt Reference as a Comparator May 12, 2015
Application note Designing Overcurrent protection for TPL7407L Peripheral Driver Nov. 05, 2014
Application note Low-cost flyback solutions for 10-mW standby power Jan. 22, 2014
Technical articles Power Tips: How to Regulate a Low-Voltage, Isolated Supply Jan. 16, 2014
Application note Supplying TPS61200 With a Single Solar Cell (Rev. B) Sep. 06, 2011
Application note Setting the shunt voltage on an adjustable shunt regulator Sep. 01, 2011
Application note Implementing a Buck Converter With the TPS23753A Sep. 20, 2010
User guide Low Cost Isolated Power Supply for PoE Applications May 20, 2003
User guide 10-Watt Flyback Converter Utilizing the UCC3809 (Rev. B) Sep. 14, 2001

Design & development

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

Hardware development

EVALUATION BOARD Download
Description

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.

Features
  • 24 port PoE PSE system and expandable to 48 ports
  • Highly flexible system with configurable GUI and host interface
  • Multiport power management
  • IEEE802.3bt compliance
  • Mutiple power supplies
  • Supporting legacy powered devices

Design tools & simulation

SIMULATION MODEL Download
SLIM005A.ZIP (161 KB) - PSpice Model
SIMULATION MODEL Download
SLVM088.ZIP (3 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLVM089.TSC (45 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLVM090.TSC (80 KB) - TINA-TI Reference Design
SIMULATION TOOL 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 TOOL Download
TL431 component calculator
TL431CALC 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.

Reference designs

Many TI reference designs include the TLV431 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

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

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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