LM35CA National Semiconductor, LM35CA Datasheet

LM35CA

Manufacturer Part Number

LM35CA

Description

Precision Centigrade Temperature Sensors

Manufacturer

National Semiconductor

Datasheet

1.LM35CA.pdf (13 pages)

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LM35

Precision Centigrade Temperature Sensors

General Description

The LM35 series are precision integrated-circuit temperature

sensors, whose output voltage is linearly proportional to the

Celsius (Centigrade) temperature. The LM35 thus has an

advantage over linear temperature sensors calibrated in

˚ Kelvin, as the user is not required to subtract a large con-

stant voltage from its output to obtain convenient Centigrade

scaling. The LM35 does not require any external calibration

or trimming to provide typical accuracies of

temperature and

ture range. Low cost is assured by trimming and calibration

at the wafer level. The LM35’s low output impedance, linear

output, and precise inherent calibration make interfacing to

readout or control circuitry especially easy. It can be used

with single power supplies, or with plus and minus supplies.

As it draws only 60 µA from its supply, it has very low

self-heating, less than 0.1˚C in still air. The LM35 is rated to

operate over a −55˚ to +150˚C temperature range, while the

LM35C is rated for a −40˚ to +110˚C range (−10˚ with im-

proved accuracy). The LM35 series is available packaged in

Typical Applications

TRI-STATE

FIGURE 1. Basic Centigrade Temperature Sensor

is a registered trademark of National Semiconductor Corporation.

⁄

˚C over a full −55 to +150˚C tempera-

(+2˚C to +150˚C)

DS005516-3

DS005516

⁄

˚C at room

hermetic TO-46 transistor packages, while the LM35C,

LM35CA, and LM35D are also available in the plastic TO-92

transistor package. The LM35D is also available in an 8-lead

surface mount small outline package and a plastic TO-220

package.

Features

n Calibrated directly in ˚ Celsius (Centigrade)

n Linear + 10.0 mV/˚C scale factor

n 0.5˚C accuracy guaranteeable (at +25˚C)

n Rated for full −55˚ to +150˚C range

n Suitable for remote applications

n Low cost due to wafer-level trimming

n Operates from 4 to 30 volts

n Less than 60 µA current drain

n Low self-heating, 0.08˚C in still air

n Nonlinearity only

n Low impedance output, 0.1

FIGURE 2. Full-Range Centigrade Temperature Sensor

Choose R

OUT

= +1,500 mV at +150˚C

= +250 mV at +25˚C

= −550 mV at −55˚C

= −V

⁄

˚C typical

/50 µA

DS005516-4

for 1 mA load

www.national.com

July 1999

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