Texas Instruments TL431A – High-Precision Adjustable Shunt Voltage Reference
The TL431A from IC Manufacturer is a versatile programmable shunt voltage reference designed for precision power regulation and feedback control. With a typical reference voltage of 2.495V and ±0.5% initial accuracy, this three-terminal regulator provides stable and accurate voltage reference across a wide range of power supply circuits.
Electrical Specifications and Performance Characteristics
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (Typ) | 2.495 | V |
| Reference Voltage Tolerance | ±0.5 | % |
| Output Voltage Range | Vref to 36 | V |
| Dynamic Impedance | 0.2 | Ω |
| Output Current Range | 1 to 100 | mA |
| Package | TO-92, SOT-23, SOIC-8 | – |
Advantages Over Standard Zener Diodes
Unlike conventional Zener diodes, the TL431A offers a programmable output voltage with significantly better accuracy, temperature stability, and dynamic impedance. This precision reference is ideal for applications requiring tighter voltage regulation and adjustable thresholds.
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Key Features and Use Case Benefits
- Adjustable Output: Provides a configurable voltage reference ideal for variable voltage feedback loops.
- Low Temperature Drift: Maintains stability and performance across wide operating conditions.
- Compact Packaging: Available in TO-92 and SOT-23 formats for flexible integration in space-constrained designs.
- TI Reliability: Developed by Texas Instruments, ensuring long-term reliability and design confidence.
Typical Applications
- Isolated power supply feedback control
- Switch-mode power supplies (SMPS)
- Over-voltage/under-voltage monitoring
- Voltage reference in ADC/DAC circuits
Frequently Asked Questions (FAQ)
What is the accuracy level of the TL431A?
TL431A offers ±0.5% initial reference voltage tolerance, making it suitable for applications requiring precise voltage regulation.
Can the output voltage be adjusted?
Yes, using two external resistors, the output voltage can be set from 2.495V up to 36V, offering flexibility across different applications.
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How is TL431A better than a Zener diode?
It provides much better voltage accuracy, lower dynamic impedance, and wider adjustability, enhancing overall performance in regulation circuits.
What package options are available?
TL431A is available in TO-92 for through-hole and SOT-23/SOIC-8 for surface-mount designs, suiting a range of layout needs.
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Is the TL431A suitable for industrial applications?
Yes, its wide operating range, stable performance, and TI-grade reliability make it highly applicable for industrial and power system designs.