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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

constant voltage from its output to obtain convenient Centi-

grade scaling. The LM35 does not require any external

calibration or trimming to provide typical accuracies of

⁄

˚C

at room temperature and

⁄

˚C over a full −55 to +150˚C

temperature range. Low cost is assured by trimming and

calibration at the wafer level. The LM35’s low output imped-

ance, 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 improved accuracy). The LM35 series is available pack-

aged in 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 avail-

able 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

⁄

˚C typical

n Low impedance output, 0.1 Ω for 1 mA load

Typical Applications

DS005516-3

FIGURE 1. Basic Centigrade Temperature Sensor

(+2˚C to +150˚C)

DS005516-4

Choose R

=−V

/50 µA

OUT

=+1,500 mV at +150˚C

= +250 mV at +25˚C

= −550 mV at −55˚C

FIGURE 2. Full-Range Centigrade Temperature Sensor

November 2000

LM35 Precision Centigrade Temperature Sensors

1 2 3 4 5 6 ... 12 13

Inhaltsverzeichnis

Seite 1 - Typical Applications

LM35Precision Centigrade Temperature SensorsGeneral DescriptionThe LM35 series are precision integrated-circuit temperaturesensors, whose output volta

Seite 2 - Connection Diagrams

Block DiagramDS005516-23LM35www.national.com 10

Seite 3 - Electrical Characteristics

Physical Dimensions inches (millimeters) unless otherwise notedTO-46 Metal Can Package (H)Order Number LM35H, LM35AH, LM35CH,LM35CAH, or LM35DHNS Pack

Seite 4

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)Power Package TO-220 (T)Order Number LM35DTNS Package Number TA03FLM35www.n

Seite 5 - Figure 2

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)LIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITIC

Seite 6 - Applications

Connection DiagramsTO-46Metal Can Package*DS005516-1*Case is connected to negative pin (GND)Order Number LM35H, LM35AH, LM35CH, LM35CAH orLM35DHSee NS

Seite 7

Absolute Maximum Ratings (Note 10)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribu

Seite 8 - DS005516-14

Electrical Characteristics(Notes 1, 6)LM35 LM35C, LM35DParameter Conditions Tested Design Tested Design UnitsTypical Limit Limit Typical Limit Limit (

Seite 9

Typical Performance CharacteristicsThermal ResistanceJunction to AirDS005516-25Thermal Time ConstantDS005516-26Thermal Responsein Still AirDS005516-27

Seite 10 - Block Diagram

Typical Performance Characteristics (Continued)ApplicationsThe LM35 can be applied easily in the same way as otherintegrated-circuit temperature senso

Seite 11

Typical ApplicationsCAPACITIVE LOADSLike most micropower circuits, the LM35 has a limited abilityto drive heavy capacitive loads. The LM35 by itself i

Seite 12 - NS Package Number TA03F

Typical Applications (Continued)DS005516-10FIGURE 10. Fahrenheit ThermometerDS005516-11FIGURE 11. Centigrade Thermometer (Analog Meter)DS005516-12FIGU

Seite 13 - NS Package Number Z03A

Typical Applications (Continued)DS005516-16*=1% or 2% film resistorTrim RBfor VB=3.075VTrim RCfor VC=1.955VTrim RAfor VA=0.075V + 100mV/˚C x TambientE

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Rainbow-electronics LM35 Bedienungsanleitung

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