Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SOT23

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SOT25

Back to Inactive Datasheet Archive

TL431 (NRND)

NRND = Not Recommended for New Design

Datasheet

Contact Sales

Description

The TL431 is three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 36 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. Diodes’ TL431 has the same electrical specifications as the industry standard ‘431 and is available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively.

Feature(s)

Temperature range -40 to 125°C

Reference Voltage Tolerance at 25°C

TL431A: 2.495V ± 1.0%.

TL431B: 2.495V ± 0.5%

Low Output Noise

0.2Ω Typical Output Impedance

Sink Current Capability: 1mA to 100mA

Adjustable Output Voltage: V_REF to 36V

SOT23 and SOT25: Available in “Green” Molding Compound (No Br, Sb) and Lead Free Finish/ RoHS Compliant

Application(s)

Opto-Coupler Linearisation

Secondary side regulation

Shunt Regulators

Improved Zener

Variable Reference

Specifications & Technical Documents

Product Parameters

Accuracy (%)	0.5, 1
MaximumInput Voltage (V)	36
Maximum Slope Resistance (Ω)	0.5
Minimum Cathode Current for Regulation Typ (µA)	400
Operating Ambient Temperature Range (°C)	-40 to 125
AEC Qualified	No
ReferenceVoltage (V)	2.495
Sink Current (mA)	100

Technical Documents

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

RoHSFile

Purchase & Availability

Something went wrong with your request. Please try again later. If this problem continues, please contact Diodes support for assistance.

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2512	2021-04-16	2021-07-16	Qualified Additional Assembly & Test (A/T) Site