TS431I

Adjustable Precision Shunt Regulator

1/13

Version: A07

TO-92

SOT-89

SOT-23

SOP-8

General Description

The TS431I/431AI/431BI 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 0.22Ω. 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 TS431I/431AI/431BI operates as a

shunt regulator, it can be used as either a positive or negative stage reference.

Features

●

Precision Reference Voltage

TS431I – 2.495V±2%

TS431AI – 2.495V±1%

TS431BI – 2.495V±0.5%

●

Equivalent Full Range Temp. Coefficient: 50ppm/ ºC

●

Programmable Output Voltage up to 36V

●

Fast Turn-On Response

●

Sink Current Capability of 1~100mA

●

Low Dynamic Output Impedance: 0.2Ω

●

Low Output Noise

Ordering Information

Part No.

Package

Packing

TS431xIT B0

TO-92

1Kpcs / Bulk

TS431xIT A3

TO-92

2Kpcs / Ammo

TS431xIX RF

SOT-23

3Kpcs / 7” Reel

TS431xIY RM

SOT-89

1Kpcs / 7” Reel

TS431xIS RL

SOP-8

2.5Kpcs / 2.5” Reel

Note: Where xx denotes voltage tolerance

Blank: ±2%

A: ±1%

B: ±0.5%

Application

●

Voltage Monitor

●

Delay Timmer

●

Constant –Current Source/Sink

●

High-Current Shunt Regulator

●

Crow Bar

●

Over-Voltage / Under-Voltage Protection

Block Diagram

Parameter

Symbol

Limit

Unit

Cathode Voltage (Note 1)

Vka

37

V

Continuous Cathode Current Range

Ik

-100 ~ +150

mA

Reference Input Current Range

Iref

-0.05 ~ +10

mA

Power Dissipation

TO-92

SOT-23

SOT-89 / SOP-8

Pd

0.625

0.30

0.50

W

Junction Temperature

Tj

+150

Operating Temperature Range

Toper

-40 ~ +85

Storage Temperature Range

Tstg

-65 ~ +150

Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.

Pin Definition:

1. Reference

2. Cathode

3. Anode

Pin Definition:

1. Cathode

8. Reference

2. Anode

7. Anode

3. Anode

6. Anode

4. N/C

5. N/C

Pin Definition:

1. Reference

2. Anode

3. Cathode