Product details


VO (V) 2.5 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 Rating Automotive VO adj (Min) (V) 2.5 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 80 Temp coeff (Max) (ppm/ degree C) 66 Operating temperature range (C) -40 to 125 Iout/Iz (Max) (mA) 15 open-in-new Find other Shunt voltage references

Package | Pins | Size

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 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Reference voltage tolerance at 25°C
    • 0.5% (B grade)
    • 1% (A grade)
  • Minimum typical output voltage: 2.5 V
  • Adjustable output voltage: Vref to 36 V
  • Operation from −40°C to +125°C
  • 27 mV maximum temperature drift
  • 0.3-Ω typical output impedance
  • Sink-current capability
    • Imin = 0.08 mA (max)
    • IKA = 15 mA (max)
  • Reference input current IREF: 0.4 µA (max)
  • Deviation of reference input current over temperature, II(dev): 0.3 µA (max)

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The ATL43xLI-Q1 is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. Its output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V with two external resistors. The device has a typical output impedance of 0.3 Ω. Its active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. This device is a pin-to-pin alternative to the TL431LI-Q1 and TL432LI-Q1, with lower minimum operating current to help reduce system power consumption. The ATL432LI-Q1 has exactly the same functionality and electrical specifications as the ATL431LI-Q1, but has a different pinout for the DBZ package.

The ATL431LI-Q1 is offered in two grades, with initial tolerances (at 25°C) of 0.5%, and 1%, for the B and A grade, respectively. The ATL43xLI-Q1 is characterized for operation from –40°C to +125°C, and its low output drift versus temperature ensures good stability over the entire temperature range.

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Technical documentation

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Type Title Date
* Data sheet ATL431LI-Q1 / ATL432LI-Q1 High Bandwidth Low-IQ Programmable Shunt Regulator datasheet (Rev. A) Nov. 14, 2019
Functional safety information ATL43xLI-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Sep. 17, 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application note Implementing Voltage References and Supervisors Into Your Traction Inverter Desi May 22, 2019
Application note Designing with the ATL431LI Nov. 27, 2018

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