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Tl431 package _tl431 main parameters
Tl431 is a controllable precision voltage regulator that allows users to set the output voltage between 2.5V and 36V using just two resistors. This device is widely used as an alternative to Zener diodes in various applications such as digital voltmeters, op-amp circuits, adjustable power supplies, and switching power supplies. With a typical dynamic impedance of 0.2Ω, it offers excellent stability and performance.
The Tl431 is manufactured by Texas Instruments and is known as a three-terminal adjustable shunt reference source with strong thermal stability. It can be easily configured for different voltage levels, making it a flexible component in many electronic designs. The package types include TO-92, SOT-89, and SOT-23, which are similar in size to common transistors like the 9013. Some versions also come in dual-inline packages, offering more flexibility depending on the application.
In terms of key parameters, the Tl431 features a programmable output voltage range from 2.5V to 36V, with a reference voltage accuracy of ±0.4% (typical at 25°C). Its low dynamic output impedance of 0.22Ω ensures stable performance even under varying load conditions. The temperature coefficient is typically 50 ppm/°C, meaning the output voltage remains highly stable across a wide operating temperature range.
Additionally, the Tl431 supports an output current range of 1mA to 100mA, making it suitable for both low-power and moderate-load applications. It also has a maximum input voltage rating of 37V and a maximum operating current of 150mA. The internal reference voltage is fixed at 2.5V, but this can be adjusted externally using external resistors. The device is available in multiple package styles, including TO-92, PDIP-8, Micro-8, SOIC-8, and SOT-23, allowing for easy integration into different circuit designs.
With its combination of affordability, reliability, and versatility, the Tl431 has become a popular choice among engineers and hobbyists alike. Whether you're working on a simple power supply or a complex analog circuit, the Tl431 provides a solid foundation for precise voltage regulation.