Technical Data

Adjustable Precision Shunt Regulator

Data Sheet N1595 Rev. -

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SMC431

TL431

TL431A

Description:

The SMC431, TL431A and TL431 are 3-terminal adjustable precision shunt regulators with guaranteed

temperature stability over the applicable extended commercial temperature range. The output voltage

may be set at any level greater than 2.495V (VREF) up to 30V merely by selecting two external resistors

that act as a voltage divider network. These devices have a typical output impedance of 0.08Ω. Active

output circuitry provides a very sharp turn-on characteristic, making these devices excellent improved

replacements for zener diodes in many applications. The precise ±0.5% reference voltage tolerance of

the SMC431 makes it possible in many applications to avoid the use of a variable resistor,

consequently saving cost and eliminating drift and reliability problems associated with it.

Features:

•

Precision Reference Voltage.

SMC431 : 2.495V ±0.5%

TL431A : 2.495V ±1.0%

TL431 : 2.495V ±1.6%

•

Sink Current Capability: 200mA.

•

Minimum Cathode Current for Regulation: 250μA.

•

Equivalent Full-Range Temperature Coefficient: 50 ppm/℃.

•

Fast Turn-On Response.

•

Low Dynamic Output Impedance: 0.08Ω.

•

Adjustable Output Voltage.

•

Low Output Noise.

•

Space Saving Packages: SOT-23

Applications:

•

Linear Regulators.

•

Adjustable Supplies.

•

Switching Power Supplies.

•

Battery Operated Computers.

•

Instrumentation.

•

Computer Disk Drivers.

Typical application circuit: