The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5 V (VREF) up to 36 V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turnon characteristics this device is an excellent replacement for many Zener diode applications.
The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM431 Adjustable Precision Zener Shunt Regulator datasheet (Rev. H) | PDF | HTML | Jan 6, 2016 |
| Application brief | A Simple Constant Voltage Regulation Using the MODE Pin (Rev. A) | PDF | HTML | Feb 15, 2024 | |
| E-book | Tips and tricks for designing with voltage references (Rev. A) | May 7, 2021 | ||
| Selection guide | 431 Device Nomenclature (Rev. B) | Sep 18, 2019 | ||
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | Jun 28, 2019 | ||
| Analog design Journal | Low-cost flyback solutions for 10-mW standby power | Jan 22, 2014 | ||
| Application note | AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) | May 1, 2013 | ||
| Application note | Precision Output Current Limiting Using Average Current Monitor Feature | Jun 21, 2011 | ||
| Application note | TO-92 Packing Options / Ordering Instructions (Rev. A) | Jun 23, 2010 |
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. (...)
This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)
Use our reference design selection tool to review and identify designs that best match your application and parameters.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TO-92 (LP) | 3 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |
| SOT-23 (DBZ) | 3 | Ultra Librarian |
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