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TL431: Adjustable Precision Shunt Regulator — Complete Guide
TL431 guide: 2.5V reference shunt regulator, applications, circuit examples and sourcing.
TL431 guide: 2.5V reference shunt regulator, applications, circuit examples and sourcing.
The TL431 is a three-terminal adjustable shunt regulator that serves as a precision reference in power supplies. This guide covers its use and procurement.
By Vigny (深圳市华芯购电子有限公司) · Published 2026-09-27 · Data verified 2026-09-29 · Sources: manufacturer datasheets & HuaXinGou stock verification
The TL431 regulates its cathode voltage to 2.5V times (1 + R1/R2) between reference and cathode. Output can be set from 2.5V up to 36V with two resistors.
Reference accuracy is typically 0.5%-2% depending on grade, cathode current 1-100mA, and it operates from 2.5V to 36V. Available in TO-92, SOT-23 and SOIC-8.
It is used in switch-mode power supply feedback loops (with optocouplers), linear regulator references, voltage monitoring and battery chargers.
TL431 is produced by TI, onsemi, NXP and many others. Specify package and tolerance grade (e.g., TL431ACLP). HuaXinGou verifies stock and batch on request.
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