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The TL431A Programmable Precision Reference is an adjustable precision voltage reference device designed for voltage regulation, feedback, monitoring, and power-supply control circuits. Although sometimes described as a programmable transistor, the TL431A is more accurately classified as a three-terminal programmable shunt voltage reference.
Its adjustable reference voltage allows designers to configure the desired regulation point using external resistors, making it useful in switching power supplies and other precision voltage-control applications.
Programmable precision shunt voltage reference
Adjustable output/reference voltage
Three-terminal device
Suitable for voltage regulation and feedback
High stability for power-supply applications
Compact and easy to integrate
Suitable for through-hole or PCB-based circuits depending on package
Switching power supplies
Voltage regulation
Power-supply feedback circuits
Battery chargers
Over-voltage and under-voltage detection
Voltage monitoring
Precision reference circuits
LED and power-control circuits
DIY and electronic repair projects
The TL431A Programmable Precision Reference is a versatile component for accurate voltage monitoring and regulation, making it suitable for power-supply design, electronics repair, prototyping, and control applications.