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Shunt voltage references

TLV431

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

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Data sheet

TLV431

ACTIVE
Data sheet Order now

Product details

VO (V) 1.24 Initial accuracy (max) (%) 1.5 VO adj (min) (V) 1.24 VO adj (max) (V) 6 Iz for regulation (min) (µA) 55 Reference voltage (V) adjustable Rating Catalog Temp coeff (max) (ppm/°C) 138 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
VO (V) 1.24 Initial accuracy (max) (%) 1.5 VO adj (min) (V) 1.24 VO adj (max) (V) 6 Iz for regulation (min) (µA) 55 Reference voltage (V) adjustable Rating Catalog Temp coeff (max) (ppm/°C) 138 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 SOT-23 (DBZ) 3 6.9204 mm² 2.92 x 2.37 SOT-89 (PK) 3 18.4275 mm² 4.5 x 4.095 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68
  • Low-voltage operation, VREF = 1.24V
  • Adjustable output voltage, VO = VREF to 6V
  • Reference voltage tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical temperature drift
    • 4mV (0°C to 70°C)
    • 6mV (–40°C to 85°C)
    • 11mV (–40°C to 125°C)
  • Low operational cathode current, 80µA typical
  • 0.25Ω typical output impedance
  • Ultra-small SC-70 package offers 40% smaller footprint than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24V to 18 V) and IK (80mA)
    • 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 = 1.24V
  • Adjustable output voltage, VO = VREF to 6V
  • Reference voltage tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical temperature drift
    • 4mV (0°C to 70°C)
    • 6mV (–40°C to 85°C)
    • 11mV (–40°C to 125°C)
  • Low operational cathode current, 80µA typical
  • 0.25Ω typical output impedance
  • Ultra-small SC-70 package offers 40% smaller footprint than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24V to 18 V) and IK (80mA)
    • 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.

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 (1.24V) and 6V with two external resistors (see the Parameter Measurement Information section). These devices operate from a lower voltage (1.24V) 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 3V to 3.3V switching-mode power supplies. These devices have a typical output impedance of 0.25Ω. 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 (1.24V) and 6V with two external resistors (see the Parameter Measurement Information section). These devices operate from a lower voltage (1.24V) 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 3V to 3.3V switching-mode power supplies. These devices have a typical output impedance of 0.25Ω. 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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Technical documentation

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Type Title Date
* Data sheet TLV431x Low-Voltage Adjustable Precision Shunt Regulator datasheet (Rev. Z) PDF | HTML 12 Jun 2024
Application brief A Simple Constant Voltage Regulation Using the MODE Pin (Rev. A) PDF | HTML 15 Feb 2024
Application note Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML 09 Jan 2024
Technical article Mitigating CMTI on a PSR flyback for SiC-based traction inverter designs PDF | HTML 05 Jan 2024
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
Analog Design Journal High-side current sources for industrial applications 12 Mar 2019
Circuit design Window comparator circuit (Rev. A) PDF | HTML 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 PDF | HTML 27 Apr 2016
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 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.

View Options
Simulation model

TLV431 Family TINA-TI AC Reference Design

SLVM090.TSC (80 KB) - TINA-TI Reference Design
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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 Transient and AC Spice Model

SLVM088.ZIP (3 KB) - TINA-TI Spice Model
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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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Calculation tool

SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
Supported products & hardware

Supported products & hardware

Products
Shunt voltage references
ATL431 — 2.5-V low-IQ adjustable precision shunt regulator ATL431LI — Low-IQ programmable shunt regulator offered in an ultra-small DQN package ATL431LI-Q1 — Automotive, high-bandwidth, low-IQ programmable shunt regulator (pinout: KRA) ATL432 — 2.5-V precision programmable shunt regulator ATL432LI — High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) ATL432LI-Q1 — Automotive, high-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) LM4030 — Ultra-high-precision shunt voltage reference LM4040 — Fixed voltage, 45-µA, precision micropower shunt voltage reference LM4040-N — 100-ppm/°C precision micropower shunt voltage reference LM4040-N-Q1 — Automotive, 100-ppm/°C precision micropower shunt voltage reference LM4040C25-EP — Enhanced Product 2.5-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy LM4041-N — Fixed & adjustable, 45-µA, precision micropower shunt voltage reference LM4041-N-Q1 — Automotive, precision micropower shunt voltage reference LM4041A12 — 1.2-V precision micropower shunt voltage reference with 0.1% accuracy LM4041B — Adjustable, precision micropower shunt voltage reference with 0.2% accuracy LM4041B12 — 1.2-V precision micropower shunt voltage reference with 0.2% accuracy LM4041C — Adjustable, precision micropower shunt voltage reference with 0.5% accuracy LM4041C12 — 1.2-V precision micropower shunt voltage reference with 0.5% accuracy LM4041D — Adjustable, precision micropower shunt voltage reference with 1% accuracy LM4041D12 — 1.2-V precision micropower shunt voltage reference with 1% accuracy LM4050-N — 50-ppm/°C precision micropower shunt voltage reference LM4050-N-Q1 — Automotive, 50-ppm/°C precision micropower shunt voltage reference LM4050QML-SP — Radiation-hardened QMLV, 2.5-V or 5-V shunt voltage reference LM4051-N — Fixed & adjustable, precision micropower shunt voltage reference LMV431 — 1.5%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431A — 1%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431B — 0.5%, low-voltage (1.24-V) adjustable precision shunt regulator TL431 — Adjustable precision shunt regulator TL431-Q1 — Automotive adjustable precision shunt regulator (pin layout: KRA) TL431C — 2% adjustable precision shunt regulator TL431LI — Adjustable precision shunt regulator with optimized reference current (pin layout: KRA) TL431LI-Q1 — Automotive, adjustable, precision shunt regulator with optimized reference current TL432 — Adjustable precision shunt regulator (reverse pinout) TL432-Q1 — Automotive adjustable precision shunt regulator (pin layout: RKA) TL432LI — Adjustable precision shunt regulator with optimized reference current (pin layout: RKA) TL432LI-Q1 — Automotive, adjustable, precision shunt regulator with optimized reference current TLA431 — All-capacitor stable precision programmable reference with KRA pin layout TLA432 — All-capacitor stable precision programmable reference with RKA pin layout TLV431 — 1.5% accuracy, low-voltage, adjustable precision shunt regulator TLV431A — 1% accuracy, low-voltage, adjustable precision shunt regulator TLV431A-Q1 — Automotive, low-voltage adjustable precision shunt regulator TLV431B — 0.5% accuracy, low-voltage, adjustable precision shunt regulator TLV431B-Q1 — Automotive, low-voltage adjustable precision shunt regulator TLVH431 — 1.5% low-voltage wide-operating current adjustable precision shunt regulator TLVH431A — 1% low-voltage wide-operating current adjustable precision shunt regulator TLVH431A-Q1 — Automotive, low-voltage adjustable precision shunt regulator TLVH431B — 0.5% low-voltage wide-operating current adjustable precision shunt regulator TLVH431B-EP — Enhanced-plastic 0.5% low-voltage wide-operating-current adjustable precision shunt regulator TLVH431B-Q1 — Automotive, low-voltage adjustable precision shunt regulator (reverse pinout) TLVH432 — 1.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) TLVH432A — 1% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) TLVH432B — 0.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout)
General-purpose op amps
TLV4313 — Quad, 5.5-V, 1-MHz, low quiescent current (65-μA), RRIO operational amplifier TLV4314 — Quad, 5.5-V, 3-MHz, RRIO operational amplifier TLV4314-Q1 — Automotive-grade, quad, 5.5-V, 3-MHz, RRIO operational amplifier TLV4316 — Quad, 5.5-V, 10-MHz, RRIO operational amplifier TLV4316-Q1 — Automotive-grade, quad, 5.5-V, 10-MHz, RRIO operational amplifier TLV4379 — Quad, 5.5-V, 90-kHz, low quiescent current (4-μA), RRIO operational amplifier
Precision op amps (Vos<1mV)
TLV4333 — Quad, 350-kHz, low-noise, RRIO, CMOS operational amplifier for cost-sensitive systems TLV4376 — Quad 5.5-MHz, 100-µV offset, 8-nV/√Hz noise, 815-µA power, precision operational amplifiers TLV4387 — Quad, ultra-high-precision (10 μV) zero-drift (0.01 μV/°C) low-input-bias-current op amp
Launch
Calculation tool

TL431CALC — TL431 Design 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.

Supported products & hardware

Supported products & hardware

Products
Shunt voltage references
TL1431 — Precision adjustable (programmable) shunt reference TL431 — Adjustable precision shunt regulator TL432 — Adjustable precision shunt regulator (reverse pinout) TLV431 — 1.5% accuracy, low-voltage, adjustable precision shunt regulator
Software
Calculation tool
TL431CALC — TL431 component calculator
Download
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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Reference designs

TIDA-050026-23882 — 24-port (PoE 2, 2-pair) power sourcing equipment reference design for multi-port applications ;

This reference design showcases a Type-3, 30W, 2-Pair 24-port Ethernet switch for Power over Ethernet (PoE) applications which can send up to 30W per port for IEEE 802.3bt Type 3 applications and up to 60W per port for non-standard applications. Based on the MSP430F523x family, TI's TPS2388x (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP41017 — 3kW two-phase interleaved half-bridge LLC reference design with GaN and C2000™ MCU

This reference design is a 3-kW, two-phase, interleaved half-bridge inductor-inductor-capacitor (LLC) using the LMG3422 and F280039C devices. This design can achieve 98.1% peak efficiency and 313 W / in³ power density and can be used as the output stage of a common redundant power supply (...)
Test report: PDF
Reference designs

PMP20967 — Adjustable dual-level constant-current load reference design for transient testing

This adjustable dual-level constant-current load reference design helps engineers test a power supply output load transient response with special features and easy operation. The board provides load transient adjustments for low and high level with slew rates as high as 100 A/µs. Timing (...)
Test report: PDF
Reference designs

TIDA-050045 — Type 3 IEEE802.3bt-ready active clamp forward converter PoE powered device reference design

This TI reference design showcases a Type-3, Class 6, 51-W active clamp forward converter for powered devices (PD) through PoE. The TPS23730 PD controller provides detection and classification while also containing a PWM controller. This design takes in a 37-V to 57-V PoE input, and outputs a 5-V (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01456 — Compact, Non-Isolated 3 Phase Inverter Reference Design for 200-480 VAC Industrial Drives

This reference design realizes a 3 phase inverter subsystem for variable frequency AC inverter drives and servo drives. This design is particularly suited for drive architectures in which the microcontroller and inverter ground are non-isolated. The basic isolated gate driver UCC5320S is used for (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00202 — Interface to a HIPERFACE Position Encoder Reference Design

The TIDA-00202 reference design implements an EMC compliant industrial hybrid analog and digital interface to a HIPERFACE position encoder. A 3.3V supply RS485 transceiver with IEC-ESD and IEC-EFT protection is used for the bidirectional parameter channel. For the analog sin/cos signal (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 5 Ultra Librarian
SOT-23 (DBZ) 3 Ultra Librarian
SOT-89 (PK) 3 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

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