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LM431

Programmable Shunt Regulator

Fairchild Semiconductor 

www.fairchildsemi.com

LM431SA/LM431SB/LM431SC

Programmable Shunt Regulator

Features

• Programmable Output Voltage to 36 Volts

• Low Dynamic Output Impedance 0.20 Typical

• Sink Current Capability of 1.0 to 100mA

• Equivalent Full-Range Temperature Coefficient of

50ppm/°C Typical

• Temperature Compensated for Operation Over Full Rated

Operating Temperature Range

• Low Output Noise Voltage

• Fast Turn-on Response

Description

The LM431SA/LM431SB/LM431SC are three terminal

output adjustable regulators with thermal stability over

operating temperature range. The output voltage can be set

any value between VREF (approximately 2.5 volts) and 36

volts with two external resistors. These devices have a

typical dynamic output impedance of 0.2Ω Active output

circuit provides a sharp turn-on characteristic, making these

devices excellent replacement for Zener Diodes in many

applications.

SOT-89

1

1. Ref 2. Anode 3. Cathode

SOT-23F

3

12

1. Cathode 2. Ref 3. Anode

Internal Block Diagram

©2002 Fairchild Semiconductor Corporation

Rev. 1.0.3

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