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TL431CD Programmable Voltage Reference: Pinout, Features, and Datasheet

Q: 1.What is TL431 used for?

The TL431 is a "programmable precision reference" and is commonly used in switching power supplies, where it provides feedback indicating if the output voltage is too high or too low. By using a special circuit called a bandgap, the TL431 provides a stable voltage reference across a wide temperature range.

Q: 2.What is TL431 transistor?

The TL431 is a regulator diode whose output voltage can be programmed by changing the value of resistors connected to it. It acts almost like a Zener diode except for that the voltage rating of this IC is programmable. It is commonly used to provide negative or positive voltage references.

Q: 3.How is TL431 measured?

The multimeter range is set to Rxlk, the black pen is connected to A pole, and the red pen is connected to K pole. At this time, the forward resistance of the Zener diode is measured. To measure the reverse resistance elbow, the range should be set to Rxlk.

Q: 4.What are the TL431 pin functions?

TL431 is a three-terminal adjustable shunt reference voltage source with good thermal stability. Its output voltage can be arbitrarily set to any value in the range from Vref (2.5V) to 36V with two resistors. The typical dynamic impedance of this device is 0.2Ω. It can be used to replace Zener diodes in many applications, such as digital voltmeters, operational amplifier circuits, adjustable voltage power supplies, switching power supplies, and so on.

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Published: 15 May 2021 | Last Updated: 15 May 2021

1527

TL431CD

STMicroelectronics

0°C~70°C TA Adjustable PMIC TL431 1 Channel 8-SOIC (0.154, 3.90mm Width)

Purchase Guide

0°C~70°C TA Adjustable PMIC TL431 1 Channel 8-SOIC (0.154, 3.90mm Width)

TL431CD is an automotive adjustable voltage reference. This article mainly introduces pinout, specifications, features, and other detailed information about STMicroelectronics TL431CD.

The TL431 programmable precision voltage reference IC - see how it works, look at some simulation models and finally simulate some circuits using LTspice.

Electronics Tutorial - The TL431

Catalog

TL431CD Description

The TL431 are adjustable shunt voltage references with guaranteed temperature stability over the entire operating temperature range. The device temperature range is extended for the automotive version from -40 °C up to +125 °C. The output voltage can be set to any value between 2.5 and 36 V with two external resistors. The TL431 operates with a wide current range from 1 to 100 mA with a typical dynamic impedance of 0.22 Ω.

TL431CD Pin connections

pin connections.jpg

TL431CD CAD model

PCB Symbol - Texas Instruments TL431CD.png

PCB Symbol - Texas Instruments TL431CD

PCB Footprint - Texas Instruments TL431CD

3D Model - Texas Instruments TL431CD

TL431CD Features

AEC-Q100 qualified
Adjustable output voltage: 2.5 to 36 V
Sink current capability: 1 to 100 mA
Typical output impedance: 0.22 Ω
1% and 2% voltage precision
Automotive temp. range -40 °C to +125 °C

TL431CD Block diagram

TL431 block diagram.png

SpecificationS

TL431CD Alternatives

Part Number	Description	Manufacturer
TL431ILP	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, PBCY3, TO-92, 3 PIN	Calogic Inc
TL431CLP	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, ROHS COMPLIANT, PLASTIC, TO-226, TO-92, 3 PIN	Rochester Electronics LLC
TL431ACLPRA	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PBCY3	Motorola Mobility LLC
TL431ILPR	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, ROHS COMPLIANT, PLASTIC, TO-226, TO-92, 3 PIN	Rochester Electronics LLC
TL431ACDR2	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PDSO8, PLASTIC, SOP-8	ON Semiconductor
TL431ILPRP	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PBCY3, PLASTIC, TO-92, TO-226, 3 PIN	ON Semiconductor
TL431AILPRAG	Voltage Reference, Programmable Precision, Shunt Regulator, TO-92 (TO-226) 5.33mm Body Height, 2000-REEL	ON Semiconductor
TL431AIDR	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PDSO8, GREEN, PLASTIC, MS-012AA, SOIC-8	Rochester Electronics LLC
ATL432LIBQDBZR	High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) 3-SOT-23 -40 to 125	Texas Instruments
TL431ACLPRE	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PBCY3	Motorola Mobility LLC

TL431CD Applications

Power supply
Industrial
Automotive
Switch mode Power supplies
Isolated Power supply circuits
Voltage comparators
Current Regulation circuits

TL431CD Package

SO-8 package outline.png

SO-8 package outline

SO-8 package mechanical data

TL431CD Manufacturer

STMicroelectronics is a global independent semiconductor company and is a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivaled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio, and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology, and its products play a key role in enabling today's convergence trends.

Datasheet PDF

Download datasheets and manufacturer documentation for STMicroelectronics TL431CD.

Datasheets :
TL431 Datasheet

Trend Analysis

Frequently Asked Questions

1.What is TL431 used for?

The TL431 is a "programmable precision reference" and is commonly used in switching power supplies, where it provides feedback indicating if the output voltage is too high or too low. By using a special circuit called a bandgap, the TL431 provides a stable voltage reference across a wide temperature range.

2.What is TL431 transistor?

The TL431 is a regulator diode whose output voltage can be programmed by changing the value of resistors connected to it. It acts almost like a Zener diode except for that the voltage rating of this IC is programmable. It is commonly used to provide negative or positive voltage references.

3.How is TL431 measured?

The multimeter range is set to Rxlk, the black pen is connected to A pole, and the red pen is connected to K pole. At this time, the forward resistance of the Zener diode is measured. To measure the reverse resistance elbow, the range should be set to Rxlk.

4.What are the TL431 pin functions?

TL431 is a three-terminal adjustable shunt reference voltage source with good thermal stability. Its output voltage can be arbitrarily set to any value in the range from Vref (2.5V) to 36V with two resistors. The typical dynamic impedance of this device is 0.2Ω. It can be used to replace Zener diodes in many applications, such as digital voltmeters, operational amplifier circuits, adjustable voltage power supplies, switching power supplies, and so on.

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TL431CD

STMicroelectronics

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