TS431/A/B

1-8

2003/12 rev. B

TS431/431A/431B

Adjustable Precision Shunt Regulator

Sink Current Capability up to 100mA

General Description

The TS431/431A/431B integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC

voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two

external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic

impedance of 0.22

Ω. The characteristics of these references make them excellent replacements for zener diodes in many

applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5volt reference makes it convenient to

obtain a stable reference from 5.0volt logic supplies, and since The TS431/431A/431B operates as a shunt regulator, it

can be used as either a positive or negative stage reference.

This series is offered in 3-pin TO-92, SOT-89, SOT-23 and SOP-8 package.

Standard Application

Features

Precision Reference Voltage

TS431

2.495V±2%

TS431A 2.495V±1%

TS431B 2.495V±0.5%

Equivalent Full Range Temp. Coefficient: 50ppm/

Programmable Output Voltage up to 36V

Fast Turn-On Response

Sink Current Capability of 1.0 to 100 mA

Low Dynamic Output Impedance: 0.22

Ω

Low Output Noise

Block Diagram

Ordering Information

Note: Where x denotes voltage tolerance.

Blank: ±2%

A: ±1%

B: ±0.5%

Part No.

Operating Temp.

(Ambient)

Package

TS431xCT

TO-92

TS431xCY

SOT-89

TS431xCX

SOT-23

TS431xCS

-20 ~ +85

SOP-8

Pin Assignment

Pin No.

TS431/A/BCT

TS431/A/BCY

TS431/A/BCX

TS431/A/BCS

Pin

Description

1

1

1

8

Reference

2

2

3

2,3,6,7

Anode

3

3

2

1

Cathode

4,5

Non connect