LM35

+V

S

R1

V

OUT

LM35

(4 V to 20 V)

OUTPUT

0 mV + 10.0 mV/°C

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SNIS159D – AUGUST 1999 – REVISED OCTOBER 2013

LM35 Precision Centigrade Temperature Sensors

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FEATURES

DESCRIPTION

The LM35 series are precision integrated-circuit

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•

Calibrated Directly in ° Celsius (Centigrade)

temperature sensors, with an output voltage linearly

•

Linear + 10 mV/°C Scale Factor

proportional to the Centigrade temperature. Thus the

•

0.5°C Ensured Accuracy (at +25°C)

LM35 has an advantage over linear temperature

sensors calibrated in ° Kelvin, as the user is not

•

Rated for Full

−55°C to +150°C Range

required to subtract a large constant voltage from the

•

Suitable for Remote Applications

output to obtain convenient Centigrade scaling. The

•

Low Cost Due to Wafer-Level Trimming

LM35 does not require any external calibration or

trimming to provide typical accuracies of ±¼°C at

•

Operates from 4 to 30 V

room temperature and ±¾°C over a full

−55°C to

•

Less than 60-

μA Current Drain

+150°C temperature range. Low cost is assured by

•

Low Self-Heating, 0.08°C in Still Air

trimming and calibration at the wafer level. The low

output impedance, linear output, and precise inherent

•

Nonlinearity Only ±¼°C Typical

calibration of the LM35 make interfacing to readout or

•

Low Impedance Output, 0.1

Ω for 1 mA Load

control circuitry especially easy. The device is used

with single power supplies, or with plus and minus

supplies. As the LM35 draws only 60

μA from the

supply, it has very low self-heating of less than 0.1°C

in still air. The LM35 is rated to operate over a

−55°C

to +150°C temperature range, while the LM35C is

rated for a

−40°C to +110°C range (−10° with

improved accuracy). The LM35 series is available

packaged in hermetic TO 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.

Figure 1. Basic Centigrade Temperature Sensor

(+2°C to +150°C)

Figure 2. Full-Range Centigrade Temperature

Sensor

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.