Product details

VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Rating Automotive 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
VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Rating Automotive 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
SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37
  • 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
  • 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

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.

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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Technical documentation

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Type Title Date
* Data sheet TL431-Q1 / TL432-Q1 Adjustable Precision Shunt Regulator datasheet (Rev. G) PDF | HTML 07 May 2020
Analog Design Journal High-power, low-cost, discrete linear pre-regulator for automotive rear lights 21 Dec 2020
Functional safety information TL43x-Q1 Functional Safety FIT Rate and Failure Mode Distribution 18 Dec 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note Automotive LED Lighting with Adjustable Shunt References 17 Jul 2018
Technical article Using dual high-current op amps to drive automotive LED lights 20 Jul 2015

Design & development

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

Simulation model

TL431 Family Unencrypted PSpice Transient and AC Model (Rev. B)

SLVM071B.ZIP (130 KB) - PSpice Model
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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PMP20305 — 11W Automotive LED Lighting Driver Reference Design

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 (...)
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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 (...)
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Reference designs

TIDA-01183 — Precision PWM Dimming LED Driver Reference Design for Automotive Lighting

This reference design shows how to use pulse width modulation (PWM) to dim an automotive headlight or tail light with precision of better than 2% duty cycle without the necessity of using a microcontroller. This allows the design to be cost competitive. Devices used in this design are the (...)
Schematic: PDF
Package Pins Download
SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options

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