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LM45 SOT-23 Precision Centigrade Temperature Sensors

August 2005

LM45

SOT-23 Precision Centigrade Temperature Sensors

General Description

The LM45 series are precision integrated-circuit temperature

sensors, whose output voltage is linearly proportional to the

Celsius (Centigrade) temperature. The LM45 does not re-

quire any external calibration or trimming to provide accura-

cies of

鹵

2藲C at room temperature and

鹵

3藲C over a full 鈭?0 to

+100藲C temperature range. Low cost is assured by trimming

and calibration at the wafer level. The LM45鈥檚 low output

impedance, linear output, and precise inherent calibration

make interfacing to readout or control circuitry especially

easy. It can be used with a single power supply, or with plus

and minus supplies. As it draws only 120 碌A(chǔ) from its supply,

it has very low self-heating, less than 0.2藲C in still air. The

LM45 is rated to operate over a 鈭?0藲 to +100藲C temperature

range.

Applications

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Battery Management

FAX Machines

Printers

Portable Medical Instruments

HVAC

Power Supply Modules

Disk Drives

Computers

Automotive

Features

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Calibrated directly in 藲 Celsius (Centigrade)

Linear + 10.0 mV/藲C scale factor

鹵

3藲C accuracy guaranteed

Rated for full 鈭?0藲 to +100藲C range

Suitable for remote applications

Low cost due to wafer-level trimming

Operates from 4.0V to 10V

Less than 120 碌A(chǔ) current drain

Low self-heating, 0.20藲C in still air

Nonlinearity only

鹵

0.8藲C max over temp

Low impedance output, 20鈩?for 1 mA load

Connection Diagram

SOT-23

01175401

Top View

See NS Package Number mf03a

Order

Number

LM45BIM3

LM45BIM3X

LM45CIM3

LM45CIM3X

Device

Top Mark

T4B

T4B

T4C

T4C

Supplied As

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

漏 2005 National Semiconductor Corporation

DS011754

www.national.com

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