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TL431A

ADJUSTABLE PRECISION SHUNT REGULATOR

Diodes Incorporated. 

TL431/TL432

ADJUSTABLE PRECISION SHUNT REGULATOR

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: VREF to 36V

• All devices are:

• Totally Lead-Free & Fully RoHS compliant

(Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device

(Note 3)

Pin Assignments

TL431

(Top View)

CATHODE 1

3 ANODE

REF 2

SOT23

(Top View)

NC

Leave floating or

connect to pin 5

2

5 ANODE

CATHODE 3

4 REF

SOT25

(Top View)

CATHODE 1

ANODE 2

ANODE 3

NC 4

8 REF

7 ANODE

6 ANODE

5 NC

SO-8

SO-8 is a future product

Applications

• Opto-Coupler Linearisers

• Shunt Regulators

• Improved Zener

• Variable Reference

TL432

(Top View)

REF 1

CATHODE 2

3 ANODE

SOT23

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen and Antimony free,

"Green" and Lead-Free.

3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

TL431

*SO-8 is a future package

Document number: DS35044 Rev. 6 - 2

1 of 14

www.diodes.com

April 2012

© Diodes Incorporated

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