The ATL431 and ATL432 are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and industrial temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5V) and 36V, with two external resistors. These devices have a typical output impedance of 0.05Ω. 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 ATL43x has > 20x improvement cathode current range over its TL43x predecessor. It also is stable with a wider range of load capacitance types and values.
ATL431 and ATL432 are the exact same parts but with different pinouts and order numbers. The ATL43x is offered in two grades, with initial tolerances (at 25°C) of 0.5%, 1%, for the B and A grade, respectively. In addition, low output drift vs temperature ensures consistent voltage regulation over the entire temperature range.
The ATL43xxI devices are characterized for operation from –40°C to +85°C, and the ATL43xxQ devices are characterized for operation from –40°C to +125°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | ATL43x 2.5V Low Iq Adjustable Precision Shunt Regulator datasheet (Rev. E) | PDF | HTML | Dec 4, 2024 |
| Application note | Precision Current Sources and Sinks Using Voltage References (Rev. A) | PDF | HTML | Apr 15, 2026 | |
| E-book | Tips and tricks for designing with voltage references (Rev. A) | May 7, 2021 | ||
| Application note | Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) | Dec 11, 2019 | ||
| Selection guide | 431 Device Nomenclature (Rev. B) | Sep 18, 2019 | ||
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | Jun 28, 2019 | ||
| Technical article | Designing for isolated DC/DC converter shunt safety | PDF | HTML | Aug 29, 2015 |
For additional terms or required resources, click any title below to view the detail page where available.
The ATL431EVM-001 evaluation module (EVM) features the functionality and adjustability of the ATL431 by letting you program the cathode voltage with various resistor values. You can also set the cathode current using the various resistors in series with the supply. (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBZ) | 3 | Ultra Librarian |
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