The TL431LI / TL432LI are pin-to-pin alternatives to TL431 / TL432. TL43xLI offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.
The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. 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 TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.
Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.
The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | TL431 / TL432 Precision Programmable Reference datasheet (Rev. P) | 14 Nov 2018 |
| E-book | Tips and tricks for designing with voltage references (Rev. A) | 07 May 2021 | |
| Application note | Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) | 11 Dec 2019 | |
| Selection guide | 431 Device Nomenclature (Rev. B) | 18 Sep 2019 | |
| Application note | Designing With the Improved TL431LI (Rev. A) | 28 Jun 2019 | |
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 28 Jun 2019 | |
| Technical article | Designing for isolated DC/DC converter shunt safety | 29 Aug 2015 | |
| Application note | Understanding stability boundary conditions charts in TL431, TL432 Data sheet (Rev. A) | 16 Jan 2014 | |
| Application note | Setting the shunt voltage on an adjustable shunt regulator | 01 Sep 2011 | |
| More literature | SLL Precision Reference Product Clip | 23 Feb 2006 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 5 | View options |
| SOT-23 (DBZ) | 3 | View options |
| SOT-89 (PK) | 3 | View options |
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