Part Number: TL431AIDBZR

Manufacturer: Nexperia USA Inc.

Description: IC VREF SHUNT ADJ 1% TO236AB

Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

Technical Specifications of TL431AIDBZR

Datasheet  TL431AIDBZR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Reference
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Reference Type Shunt
Output Type Adjustable
Voltage – Output (Min/Fixed) 2.495V
Voltage – Output (Max) 36V
Current – Output 100mA
Tolerance ±1%
Temperature Coefficient
Noise – 0.1Hz to 10Hz
Noise – 10Hz to 10kHz
Voltage – Input
Current – Supply
Current – Cathode 700μA
Operating Temperature -40°C ~ 85°C (TA)
Mounting Type Surface Mount
Package / Case TO-236-3, SC-59, SOT-23-3
Supplier Device Package SOT-23-3

TL431AIDBZR Description

The TL431LI and TL432LI can be used instead of the TL431 and TL432 pin-for-pin. With TL43xLI, you can get a more accurate system because it is more stable, has less temperature drift (VI(dev), and uses less reference current (Iref). Both the TL431 and TL432 are adjustable shunt controllers with three ends. Their thermal stability is defined over the temperature ranges where they can be used in cars, businesses, and the military. Using two external resistors, the output voltage can be set to any value between Vref (about 2.5 V) and 36 V.  The term for this set of values is “adjustable range.”

The output resistance of these devices is usually 0.2 ohms. Because the active output circuitry gives a very sharp turn-on feature, In many cases, like power supplies that can be changed, these devices can be used instead of Zener diodes,  onboard regulation, and switching power supplies. The TL432 device and the TL431 device are the same in terms of how they work and how they are wired. The only change is that the pinout for the DBZ, DBV, and PK packages differs on the TL432 device.

At 25 degrees Celsius, the TL431 and TL432 devices have starting tolerances of 0.5%, 1%, and 2% for the B, A, and standard grades, respectively. Both of these tools come in three different types. Also, a small change in output as a function of temperature helps make sure the device is stable over its whole temperature range. The TL43xxC devices are designed to work at temperatures between 0°C and 70°C, the TL43xxI devices are designed to work at temperatures between –40°C and 85°C, and the TL43xxQ devices are designed to work at temperatures between –40°C and 125°C.

Detailed Description

This standard part has been used in many ways, from sending power to sending signals. It has shown that it can be used in many different situations. This is because its main parts are a reliable voltage reference and an opamp, both very important building blocks for analog circuits. Because of this reason, it has this trait. The TL43xx must be used with its main parts to work as an amplifier,  single voltage reference, error voltage clamp, or comparator with an integrated reference.

Because the TL43xx can be used and adjusted to cathode voltages from 2.5V to 36V, this component is great for use in various end equipment in industries like automotive, telecommunications, and computers. For this part to work as an error amplifier or a shunt regulator, an input current of at least 1 mA (Imin(max)) must be sent to its cathode pin. In this case, feedback from the Cathode and Ref pins can be used to make a voltage exactly the same as the internal reference voltage. Depending on your standard voltage, you can get starting tolerances of 0.5%, 1%, or 2% at 25 degrees Celsius.

After the TL431 or TL432, the letters B (0.5%), A (1.0%), and a blank space (2.0%) show the different reference options. The TL431 and TL432 work similarly, but their pinouts are set up differently. The TL43xxC devices are designed to work at temperatures between 0°C and 70°C, the TL43xxI devices are designed to work at temperatures between –40°C and 85°C, and the TL43xxQ devices are designed to work at temperatures between –40°C and 125°C.

TL431AIDBZR Feature Description

TL43xx has an internal reference and an amplifier that sends out a sink current based on the difference between the reference and virtual internal pins. The current in the sink is made by the internal Darlington pair, as shown in the diagram above. A Darlington pair is used so that this gadget can sink up to 100 mA of current. When run with enough voltage headroom ( 2.5 V) and cathode current (IKA), TL431 pushes the reference pin to 2.5 V.

When feedback from the Cathode and Reference pins is applied, TL43xx acts like a Zener diode, regulating a fixed voltage based on how much current goes into the cathode. This happens because the internal compressor and reference are now in the right places to work. For this device to be in the right linear region and give TL43xx enough gain, it needs the same current as in the feedback case above. This is true for open loop, servo, and error amplification.

Working Principle

By comparing the voltage on the reference pin (pin 3) to a voltage reference that is included in the chip, the TL431AIDBZR operates. The device conducts, allowing current to flow through the load if the voltage at the reference pin exceeds the internal reference voltage. The device stops functioning, and the load current stops flowing if the voltage at the reference pin is lower than the internal reference voltage. By altering the voltage divider network between the reference pin and ground, the output voltage can be changed to any value.

TL431AIDBZR Device Functional Modes

Closed Loop

This device works in closed loop when the cathode or output voltage or current of TL43xx is sent back to the reference or input pin in any manner. The bulk of TL43xx applications employs it in this way to control a fixed voltage or current. This device can act as an error amplifier thanks to the feedback by computing a portion of the output voltage and changing it to preserve the intended regulation. This is performed using resistive or direct feedback to relate the output voltage back to the reference pin in a way that makes it equal to the internal reference voltage.

Layout Guidelines

Positioning bypass capacitors as close as possible to the component is best. The width of current-carrying traces must be appropriate for the amount of current they carry, which will be minimal in the case of the TL43xx.


The TL431AIDBZR is a flexible and trustworthy voltage reference IC that may be included in various electrical circuits. You can use this device efficiently in your circuit designs by comprehending its pin arrangement, operating principle, electrical characteristics, applications, and design advice.

Don’t wait any longer to incorporate the TL431AIDBZR in your circuit design if you want to get the most out of it. To order the device and learn more about it, get in touch with ICRFQ right away. You can depend on ICRFQ to always provide the best components on schedule.

4.8/5 - (397 votes)
Kevin Chen