TL431AID pinout & transistor datasheet | pdf STMicroelectronics

TL431A Pinout Equivalent

The TL431A is an adjustable shunt regulator with three terminals that offers high precision, low noise and a wide operating voltage range to provide a stable reference voltage to the circuit. Because of its powerful features and cheap price, it is a popular choice in circuit design applications such as power supplies, battery chargers and precision linear voltage regulators. The TL431A is widely used by electronics engineers, so it is important to understand its pin functions and replaceable devices.

The main parameters of the TL431A include:

Output voltage range: 2.495~36V;
Reference voltage accuracy: ±1%;
Output current: 100Ma;
Dynamic impedance: 0.22Ω;
Package: mainly includes TO-92 (more common), SOT-23, SOIC;

Pin definition

Alternative product model list:

Picture	Name	Output type	Output voltage	Output current	Precision	Package
	TL431 (0.5%)	Tunable	2.495~36V	100mA	0.5%	TO-92
	TL431CLPRPG	Tunable	2.495~36V	100mA	0.4%	TO-92-2.54mm
	TL431BQLPR	Tunable	2.495~36V	100mA	0.5%	TO-92-3
	LM431BCZX	Tunable	2.495~36V	100mA	1%	TO-92-3
	TL431G-T92-K	Tunable	2.495~36V	100mA	1%	TO-92-3

Application fields and functions:

Voltage Regulation: The TL431A is commonly used in voltage regulation circuits, mainly for linear voltage regulator and switching power supplies.

Battery charging: The TL431A can be used as a battery charging circuit to regulate the charging voltage to prevent overcharging.

Voltage monitoring: The TL431A can be used to monitor the voltage and detect whether the voltage exceeds the set value.