2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator
Product details
Parameters
Package | Pins | Size
Features
- Average Temperature Coefficient 50 ppm/°C
- Temperature Compensated for Operation Over
the Full Temperature Range - Programmable Output Voltage
- Fast Turnon Response
- Low-Output Noise
- Low-Dynamic Output Impedance
- Available in Space-Saving SOIC-8, SOT-23, and
TO-92 Packages
Description
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.
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Technical documentation
= Top documentation for this product selected by TI
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LM431 Adjustable Precision Zener Shunt Regulator datasheet (Rev. H) | Jan. 06, 2016 |
| Selection guide | 431 Device Nomenclature (Rev. B) | Sep. 18, 2019 | |
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | Jun. 28, 2019 | |
| E-book | Tips and tricks for designing with voltage references | May 30, 2017 | |
| Application note | 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 01, 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 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
ATL431EVM-001
Description
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 (...)
Features
- Adjustable regulated output from 2.5 V to 36 V
- Very-low operating current: IKA(min) = 35 µA (max) and IREF = 150 nA (max)
- Extended cathode current range from 35 µA to 100 mA
- Low output impedance of 0.3 Ω (max)
- Small form factor
- Ease of use
- Multiple gain setting options
- Stability test availability
Design tools & simulation
SNVMAB5A.ZIP (49 KB) - PSpice Model
PSPICE-FOR-TI — 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 (...)
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — 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 (...)
Features
- Case-specific tool to calculate external resistor value associated with shunt voltage reference
- Input fields for: voltage reference, supply voltage, load current and Iq bound values
- Real-time effects of input values on schematic
- Quick indicators notifying user of valid and invalid outputs
- Error messages (...)
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
| SOT-23 (DBZ) | 3 | View options |
| TO-92 (LP) | 3 | View options |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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