July 01,2022

TL431A: Regulators, Pinout, Equivalents

TL431A Description

The TL431A devices are three-terminal adjustable shunt regulators that have been thermally stabilized for use in military, commercial, and automotive applications. With the help of two external resistors, the output voltage can be adjusted to any value between Vref (about 2.5 V) and 36 V. The normal output impedance of these devices is 0.2. These devices are good alternatives to Zener diodes in various applications, including onboard regulation, adjustable power supplies, and switching power supplies, because to active output circuitry's highly sharp turn-on characteristic. The electrical and functional parameters of the TL431 device and the TL431A device are identical, but the pinouts for the DBV, DBZ, and PK packages are different.

TL431A Features

Voltage Adjustment: Vref to 36 V
Operation Between -40 and 125 °
Temperature Drift Typically (TL43xB)
Very Low Noise
Typical Output Impedance: 0.2
1 to 100 mA sink-current capability

TL431A CAD Model

Symbol

symbol

Footprint

footprint

3D Model

TL431A Functional Block Diagram

functional blcok diagram

TL431A Equivalents

Part Number	Description	Manufacturer
TL431BVLPRAGPOWER CIRCUITS	Voltage Reference, Programmable Precision, Shunt Regulator, TO-92 (TO-226) 5.33mm Body Height, 2000-REEL	onsemi
TL431BQLPPOWER CIRCUITS	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, ROHS COMPLIANT, PLASTIC, TO-226, TO-92, 3 PIN	Rochester Electronics LLC
TL431BCLPPOWER CIRCUITS	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495V, PBCY3, TO-92, 3 PIN	Motorola Mobility LLC
TL431BCLPRAGPOWER CIRCUITS	Voltage Reference, Programmable Precision, Shunt Regulator, TO-92 (TO-226) 5.33mm Body Height, 2000-REEL	onsemi
TL431BCLPRPOWER CIRCUITS	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, ROHS COMPLIANT, PLASTIC, TO-226, TO-92, 3 PIN	Rochester Electronics LLC
TL431BCLPE3POWER CIRCUITS	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, ROHS COMPLIANT, PLASTIC, TO-226, TO-92, 3 PIN	Rochester Electronics LLC
TL431BILPRAPOWER CIRCUITS	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PBCY3	Motorola Mobility LLC
TL431BCLPGPOWER CIRCUITS	Three Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3, LEAD FREE, PLASTIC, TO-92, TO-226, 3 PIN	Rochester Electronics LLC
TL431BQLPMPOWER CIRCUITS	Adjustable precision shunt regulator 3-TO-92 -40 to 125	Texas Instruments
TL431BVLPPOWER CIRCUITS	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495V, PBCY3, PLASTIC, TO-92, TO-226, 3 PIN	Rochester Electronics LLC

TL431A Recommended Operating Conditions

			MIN	MAX	UNIT
Vka	Cathode voltage		Vref	36	V
Ika	Cathode current		1	100	mA
		TL43xxC	0	70
Ta	Operating free-air temperature	TL43xxl	-40	85	°C
		TL43xxQ	-40	125

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Supply Chain
- Factory Lead TimeFactory lead time is a period needed by the factory to process a product from the moment when customer places the order till the delivery time.6 Weeks
- Lifecycle StatusLifecycle status indicates the different status of different products for use, including obsolete, next generation, and more.ACTIVE (Last Updated: 3 days ago)

Dimensions
- HeightHeight refers to the extent of the electronic components from base to top.1.75mm
- LengthLength refers to the extent of the electronic components from end to end.4.9mm
- WidthWidth refers to the extent of the electronic components from side to side.3.91mm
- ThicknessThickness is defined as the distance between the opposite sides of electronic components.1.58mm

Physical
- Mounting TypeMounting types explain the different ways that different electronic components are mounted, including surface mount, through-hole mount, panel mount, and more.Surface Mount
- Package / CasePackage/Case refers to the bulk specification of products when they are distributed, stored, or used.8-SOIC (0.154, 3.90mm Width)
- Surface MountSurface mount means that the electronic components are mounted on the surface of objects. YES
- Number of PinsPins are the connections between the internal circuits of the integrated circuit (chip) and the peripheral circuits, and all the pins constitute the interface of this chip.8
- WeightWeight is a measure of the size of an object under gravity. Weight and mass are different, and the unit is Newton. It is a basic attribute of an object.72.603129mg

Technical
- Operating TemperatureAn operating temperature is a specified temperature range which ensures the efficient operation of an electric or mechanical device. It varies according to different devices.-40°C~85°C TA
- PackagingPackaging refers to the bulk specification of products when they are distributed, stored, or used.Tube
- ToleranceTolerance is an allowable variation within a certain range. The subtle influence caused by the tolerance can be ignored.±1%
- JESD-609 CodeJESD-609 requires that the surface or terminal finish or material must be marked under space permission, otherwise, alternating marking should be provided. The marking way can be the forma of barcode or 2D.e4
- Pbfree CodePbfree code is used for electrical and electronic devices in which the lead (Pb) level is reduced to a level below 1000ppm (<0.1%). This requirement is conducive to environmental protection.yes
- Part StatusPart status indicates the different status of different products for use. Active
- Moisture Sensitivity Level (MSL)Moisture sensitivity level (MSL) was proposed to provide a classification standard for the packaging of human-sensitive SMD component.1 (Unlimited)
- Number of TerminationsIn electronics, termination refers to the action to end a transmission line, thus preventing the signals from being reflected from the end of the line.8
- ECCN CodeECCN code is used to show the level of export control based on the type and performance of high-tech products and technologies (especially integrated circuits).EAR99
- Temperature CoefficientA temperature coefficient indicates the rate at which the physical properties of a material change relatively with temperature.34 ppm/°C
- Terminal FinishWhen selecting component terminal finishes, avoid choosing lead-containing finishes to ensure that the component molding plastic can withstand the higher temperatures associated with lead-free soldering.Nickel/Palladium/Gold (Ni/Pd/Au)
- Terminal PositionA terminal is the point where a conductor of an electronic component comes to an end. It can also be connected to the external circuits.DUAL
- Terminal FormA terminal is the point where a conductor of an electronic component comes to an end. It can also be connected to the external circuits.GULL WING
- Peak Reflow Temperature (Cel)The highest temperature that all SMD electronic components can withstand during reflow soldering. Unless, the electronic components will be damaged.260
- Number of FunctionsFunction of electronic components means the roles of them play in various applications.1
- Current RatingCurrent rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.100mA
- Base Part NumberBase part number is an identifier of a particular part design or material used in a particular applications.TL431
- Number of OutputsAn output of electronic components is used to reproduce or display the processing results of information which is sent by an input device. 1
- Output VoltageOutput voltage is the maximum voltage output by the electronic component. In other words, the so-called output voltage refers to the voltage value in the direction of the output current of the electronic device.36V
- Output TypeAn output of electronic components is used to reproduce or display the processing results of information which is sent by an input device. Adjustable
- Number of ChannelsA channel is designed to transfer a signal or information from a sender to a receiver.1
- Trim/Adjustable OutputAdjustable output means that the output can be adjusted thhrough certain ways.YES
- Analog IC - Other TypeAnalog integrated circuit mainly refers to an integrated circuit composed of capacitors, resistors, transistors, etc., which are integrated together to process analog signals.THREE TERMINAL VOLTAGE REFERENCE
- Input Voltage (Min)Input voltage for a device or circuit is the voltage that is supplied to or sent by the external world to the device or circuit. It is the voltage that is supplied and applied to the external world by the circuit or device. 2.495V
- Output Current-MaxCurrent is the amount of electricity flowing through any cross section of a conductor. An electric current is formed by the regular directional motion of free charges in conductors under the action of electric field forces.100mA
- Input Voltage (Max)Input voltage for a device or circuit is the voltage that is supplied to or sent by the external world to the device or circuit. It is the voltage that is supplied and applied to the external world by the circuit or device.37V
- Reference VoltageThe reference voltage is the voltage in a circuit that is constant regardless of the power supply and temperature drift, as well as time, and so on. The reference voltage could be used in power supply regulators, analog-to-digital converters, and digital-to-analog converters.2.495V
- Reference TypeIn the type of reference, programmable networks are also known as software-defined networks. They are a type of software-driven network that is controlled by automatic means for central controller nodes. It replaces the conventional embedding-based and rigid control plane using an open model of software.Shunt
- Output Voltage-MaxThe maximum voltage output by a device.36V
- Output Voltage-MinThe voltage emitted by a device, such as a voltage regulator or a generator, is known as the output voltage.2.5V
- Current - CathodeAn external current is applied to the surface of the corroded metal structure, and the protected structure becomes the cathode, so that the electron migration caused by the metal corrosion is inhibited, and the occurrence of corrosion is avoided or weakened.700μA
- Temp Coef of Voltage(Max)92 ppm/°C

Compliance
- Radiation HardeningRadiation hardening is a kind of capability of electronic components to avoid damage or malfunction which is the result of a high degree of ionizing radiation.No
- REACH SVHCSubstances that meet the requirements of Article 57 of REACH are generally considered to be a substance of very high concern (SVHC).No SVHC
- RoHS StatusRoHS is a mandatory standards used to limit the use of harmful components in electrical and electronic equipment, making them conducive to human health and environmental protection.ROHS3 Compliant
- Lead FreeLead-free is a standard that the lead content must be reduced to a level below 1000ppm (<0.1%), which environment-friendly electronic manufacturing complies with.Lead Free

TL431A Applications

• Referencing Voltage and Current Can Be Changed

• Flyback SMPS secondary side regulation

• Replacement of Zeners

• Voltage Observation

• Integrated Reference Comparator

TL431A Package

package

TL431A Manufacturer

Texas Instruments (TI) emerges as a globally recognized semiconductor manufacturer expanded into 35 countries. It has seen a rapid growth. In 1958, TIer firstly introduced the working integrated circuit. And today more than 30,000 TIers worldwide are committed to designing, manufacturing, and selling analog and embedded processing chips. They aspire to solve challenges as well as change the world through their technologies.

Frequently Asked Questions in TL431A

What is TL431A?

The TL431A devices are three-terminal adjustable shunt regulators that have been thermally stabilized for use in military, commercial, and automotive applications. With the help of two external resistors, the output voltage can be adjusted to any value between Vref (about 2.5 V) and 36 V.

What is the normal output impedance of the TL431A devices?

0.2

What are the TL431A devices good alternatives to?

Zener diodes

labelsTL431AIntegrated Circuits (ICs)

Access: 2815

Ashley

Ashley is a talented embedded systems engineer in microcontroller programming and PCB design. She is dedicated to staying up-to-date with the latest trends and technologies in the industry and is always looking for ways to incorporate them into her work.

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