TL431A adjustable parallel voltage regulator, reference voltage source, TO92 THT
€0.43
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delivery in Poland 1-2 dni InPost
TL431A adjustable shunt regulator and precision voltage reference. The device can operate as an adjustable equivalent of a Zener diode, a voltage reference or an element of a power supply feedback circuit.
Technical specifications
| Model | TL431A |
| Package marking | TL431A |
| Type | Adjustable shunt regulator |
| Package | TO-92 |
| Mounting | Through-hole THT |
| Number of leads | 3 |
| Quantity | 1 piece |
TL431A reference parameters
| Nominal reference voltage VREF | Approx. 2.495 V |
| Reference voltage accuracy class | 1% |
| Adjustable voltage range | Approx. 2.5 V to 36 V |
| Recommended cathode current | 1–100 mA, subject to allowable power dissipation |
| Minimum cathode current required for regulation | Typ. 0.5 mA, max. 1 mA |
| Voltage setting | Using two external resistors |
| Dynamic impedance | Low |
| Output voltage noise | Low level |
Detailed parameters may differ between TL431A versions. The stated voltage and maximum current do not mean that operation at both limit values simultaneously is permitted.
Operating principle
The device compares the voltage at the REF input with its internal reference voltage and adjusts the current flowing between cathode and anode accordingly.
TL431A can be used as an adjustable equivalent of a Zener diode or as part of a power supply feedback circuit.
TL431A requires external current limiting. It is a shunt regulator, not a conventional series regulator with input–ground–output terminals.
Terminals
| REF | Reference input connected to the voltage-setting divider |
| A | Anode |
| K | Cathode |
Before installation, confirm the terminal order for the specific TL431A version. Do not determine the pinout solely from the shape of the TO-92 package.
Applications
- Feedback circuits in switching power supplies, including use with an optocoupler
- Precision voltage references
- Voltage regulation and monitoring circuits
- Threshold circuits and battery voltage monitoring
- Repair of power supplies and electronic equipment
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We also offer regulators and voltage reference ICs with other parameters.
K729/TL(ID167849016)
500 Items
5905427010241
Safety information – GPSR
| Product | Adjustable shunt regulator / voltage reference |
| Model | TL431A |
| Reference voltage | Approx. 2.495 V |
| Adjustment range | Approx. 2.5–36 V |
| Cathode current | 1–100 mA, subject to power dissipation and operating conditions |
| Package | TO-92, THT |
⚠ WARNING
TL431A is a shunt regulator and requires a correctly designed external circuit, including cathode-current limiting. Incorrect wiring or excessive power dissipation may damage the device.
TL431A is a shunt regulator and requires a correctly designed external circuit, including cathode-current limiting. Incorrect wiring or excessive power dissipation may damage the device.
Safe use
| ✓ | Perform installation, removal and wiring changes with power disconnected. |
| ✓ | Confirm the REF, A and K terminal order for the specific version before installation. |
| ✓ | Provide suitable external cathode-current limiting. |
| ✓ | Take allowable power dissipation and device heating into account. |
| ✓ | After installation, check for short circuits and solder bridges. |
Current limiting
⚠ EXTERNAL CURRENT LIMITING IS REQUIRED
TL431A is a shunt regulator. It must not be connected directly to a voltage source without suitable current limiting. Cathode current and power dissipation must remain within the permitted operating conditions.
TL431A is a shunt regulator. It must not be connected directly to a voltage source without suitable current limiting. Cathode current and power dissipation must remain within the permitted operating conditions.
Limit values
A voltage range up to approximately 36 V and current up to 100 mA do not imply simultaneous operation at both limit values.
Power dissipation, device temperature and the operating conditions of the particular TL431A version must be considered.
Power dissipation, device temperature and the operating conditions of the particular TL431A version must be considered.
Minimum regulation current
An adequate minimum cathode current is required for correct regulation. The stated values are typically 0.5 mA and a maximum of 1 mA. Too little current may prevent proper regulation.
Voltage setting
The operating voltage is set by an external resistor divider connected to the REF input. Resistor values must be selected for the required voltage and operating conditions.
Terminals
| REF | Reference input |
| A | Anode |
| K | Cathode |
Do not determine the terminal order solely from the TO-92 package appearance. Confirm the pinout of the specific TL431A version before installation.
Installation and soldering
Avoid excessive or prolonged heating of the leads and package. Do not bend the leads directly at the package or subject them to excessive mechanical stress.
Storage
Store in a dry and clean place. Protect against moisture, contamination, electrostatic discharge, mechanical damage and deformation of the leads.
Important information
TL431A is an adjustable shunt regulator and voltage reference, not a conventional series voltage regulator.
The device requires external current limiting and correctly selected voltage-setting components.
Parameters may differ between TL431A versions, so applications requiring precise characteristics should refer to the documentation for the specific device.
Before first power-up, verify the pinout, current limiting, external component values and absence of short circuits.
| Manufacturer (Private Label) (EU) 2023/988 (GPSR) | |
|---|---|
| Name: | Superelektronika sp. z o.o. |
| Address: | ul. gen. K. Sosnkowskiego 26/83 05-300 Mińsk Mazowiecki, Poland |
| E-mail: | sklep@superelektronika.pl |
| Responsible Person (EU) 2023/988 (GPSR) | |
| Name: | Superelektronika sp. z o.o. |
| Address: | ul. gen. K. Sosnkowskiego 26/83 05-300 Mińsk Mazowiecki, Poland |
| E-mail: | sklep@superelektronika.pl |
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