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Product details

Parameters

VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1, 2 Rating Catalog VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 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 open-in-new Find other Shunt voltage references

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.926 x 1.626 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 open-in-new Find other Shunt voltage references

Features

  • 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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Description

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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Same functionality and pinout but is not an equivalent to the compared device:
TL432LI ACTIVE Adjustable precision shunt regulator with optimized reference current (pin layout: RKA) Pin-to-pin alternative with better stability, lower temperature drift and lower reference current for improved system accuracy.

Technical documentation

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Type Title Date
* Datasheet TL431 / TL432 Precision Programmable Reference datasheet (Rev. P) Nov. 14, 2018
Application notes Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) Dec. 11, 2019
Selection guides 431 Device Nomenclature (Rev. B) Sep. 18, 2019
Application notes Designing With the Improved TL431LI (Rev. A) Jun. 28, 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
Technical articles Designing for isolated DC/DC converter shunt safety Aug. 29, 2015
Application notes Understanding stability boundary conditions charts in TL431, TL432 Data sheet (Rev. A) Jan. 16, 2014
Application notes Setting the shunt voltage on an adjustable shunt regulator Sep. 01, 2011
More literature SLL Precision Reference Product Clip Feb. 23, 2006

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
SLOJ174.ZIP (0 KB) - Spice Model
SIMULATION MODELS Download
SLVM071B.ZIP (130 KB) - PSpice Model
SIMULATION MODELS Download
SLVM163.ZIP (4 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM164.TSC (82 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM165.TSC (65 KB) - TINA-TI Reference Design
CALCULATION TOOLS 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

REFERENCE DESIGNS Download
Variable voltage power converter 5-35-V 300-W peak reference design for automotive audio amplifiers
PMP21697 — This reference design provides a variable output power for audio amplifiers from 5 V to 35 V controllable by a Pulse Width Modulator signal. The output power capability of 75 W RMS and 300 W peak is suitable for high power automotive audio amplifiers. Conversion is 4-switch Buck-Boost for greater (...)
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Reverse Polarity and Overvoltage Protection Reference Design for Automotive Systems
PMP10737 PMP10737 is a reference design that provides protection from reverse polarity (LM74610 Smart Diode Controller) and overvoltage using discrete components.
Input voltage range is between 7V to 35V with OVP at 25V. LM74610 is used for battery reverse protection, which utilizes a charge pump to drive an (...)
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56W Active Clamp for Telecom Apps Reference Design
PMP10202 This reference design provides 28V out of 48V input voltage to supply noise sensitive loads
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CAD/CAE symbols

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

Ordering & quality

Support & training

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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

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