Product details


VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 Rating Automotive VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 TI functional safety category Functional Safety-Capable Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125 Iout/Iz (Max) (mA) 100 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 open-in-new Find other Shunt voltage references


  • Qualified for automotive applications
  • AEC-Q100 test guidance with the following:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
  • Reference voltage tolerance at 25°C:
    • 1% (A Grade)
    • 0.5% (B Grade)
  • Typical temperature drift:
    • 14 mV (Q Temp)
  • Low output noise
  • 0.2-Ω Typical output impedance
  • Sink-current capability: 1 mA to 100 mA
  • Adjustable output voltage: VREF to 36 V

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The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1 offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.

The TL431-Q1 is a three-pin adjustable shunt regulator with specified thermal stability over applicable automotive temperature ranges. The output voltage can be set to any value from VREF (approximately 2.5 V) to 36 V, with two external resistors (see Figure 28). This device has a typical output impedance of 0.2 Ω. Active output circuitry provides a sharp turnon characteristic, making this device an excellent replacement for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies.

The TL432-Q1 has exactly the same functionality and electrical specifications as the TL431-Q1 device, but has a different pinout for the DBZ package.

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Pin-for-pin with same functionality to the compared device.
TL431LI-Q1 ACTIVE Automotive, adjustable, precision shunt regulator with optimized reference current 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
* Data sheet TL431-Q1 / TL432-Q1 Adjustable Precision Shunt Regulator datasheet (Rev. G) May 07, 2020
Application note High-power, low-cost, discrete linear pre-regulator for automotive rear lights Dec. 21, 2020
Application note TL43x-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec. 18, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application note Automotive LED Lighting with Adjustable Shunt References Jul. 17, 2018
Technical article Using dual high-current op amps to drive automotive LED lights Jul. 20, 2015

Design & development

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

Design tools & simulation

SLVM071B.ZIP (130 KB) - PSpice Model
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 (...)
  • 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
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Reference designs

Bidirectional DC/DC Converter Reference Design for 12-V/48-V Automotive Systems
TIDA-01168 — The TIDA-01168 reference design is a four-phase, bidirectional DC-DC converter development platform for 12-V/48-V automotive systems. The system uses two LM5170-Q1 current controllers and a TMS320F28027F microcontroller (MCU) for the power stage control. LM5170-Q1 subsystems use average current (...)
document-generic Schematic document-generic User guide
Automotive Dual Channel SiC MOSFET Gate Driver Reference Design with Two Level Turn-off Protection
TIDA-01605 — This reference design is an automotive qualified isolated gate driver solution for driving Silicon Carbide (SiC) MOSFETs in half bridge configuration. The design includes two push pull bias supplies for the dual channel isolated gate driver respectively and each supply provides +15V and -4V output (...)
document-generic Schematic document-generic User guide
Automotive 40-V to 1-kV input flyback reference design supporting regenerative braking test
TIDA-01505 — This power supply reference design for automotive auxiliary circuits generates a 15-V, 4-A output from a wide input range of 40 V to 1 kV and up to a 1.2-kV transient. The design fits ideally into an 800-V batterydriven hybrid-electric vehicle (HEV) or electric vehicle(EV) traction inverter system (...)
document-generic Schematic document-generic User guide
SiC/IGBT isolated gate driver reference design with thermal diode and sensing FET
TIDA-020030 — This reference design is an IGBT or SiC isolated gate driver power stage driving a IGBT module with advanced protection features. The design consists of a single phase power stage from a traction inverter supporting high level of safety features. The IGBT module has integrated thermal diode for (...)
document-generic Schematic document-generic User guide
11W Automotive LED Lighting Driver Reference Design
PMP20305 — PMP20305 is an LED driver circuit reference design using the LM5022-Q1 boost controller IC and two types of constant-current methods to drive 4 strings of LEDs. Two of the LED strings utilize the TL431 voltage reference as a driver to perform a constant current source, while the other two (...)
document-generic Schematic document-generic User guide
Automotive Daytime Running Light (DRL) LED Driver Reference Design with Linear Thermal Foldback
TIDA-01382 — The TIDA-01382 reference design is a precision pulse width modulation (PWM) dimming solution for daytime running lights (DRL) including thermal foldback without requiring a microcontroller (MCU). The design includes key peripherals like electromagnetic interference (EMI) filtering, electromagnetic (...)
document-generic Schematic document-generic User guide
Precision PWM Dimming LED Driver Reference Design for Automotive Lighting
TIDA-01183 — The TIDA-01183 TI Design details a solution on how to use pulse width modulation (PWM) to dim an automotive headlight or tail light with a precision of better than 2% duty cycle without the necessity of using a micro controller. This allows the design to be very cost competitive. Devices used in (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options

Ordering & quality

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