TL431/TL432

ADJUSTABLE PRECISION SHUNT REGULATOR

TL431/432

Document number: DS35050 Rev. 2 - 2

1 of 14

www.diodes.com

September 2010

© Diodes Incorporated

Description

The TL431 and TL432 are three terminal adjustable shunt

regulators 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.

Features

• Temperature range -40 to 125ºC

• 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

• SOT23 and SOT25: Available in “Green” Molding

Compound (No Br, Sb) and Lead Free Finish/ RoHS

Compliant (Note 1)

Applications

• Opto-Coupler Linearisers

• Shunt Regulators

• Improved Zener

• Variable Reference

Pin Assignments

TL431

ANODE

1

2

CATHODE

3REF

 

4REF

5ANODE

NC

1

CATHODE

3

NC

2

(Top View )

SOT23

SOT25

(Top View)

TL432

(Top View)

ANODE

1

2

CATHODE

3

REF

SOT23

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.