LM35A Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Precision Centigrade Temperature Sensors

December 1994
LM35 LM35A LM35C LM35CA LM35D
Precision Centigrade Temperature Sensors
General Description
The LM35 series are precision integrated-circuit tempera-
ture 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 Centi-
grade scaling The LM35 does not require any external cali-
bration or trimming to provide typical accuracies of g C
at room temperature and g C over a full b55 to a150 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 mA 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 b55 to a150 C temperature
range while the LM35C is rated for a b40 to a110 C
range (b10 with improved accuracy) The LM35 series is
available packaged 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
available in an 8-lead surface mount small outline package
and a plastic TO-202 package
Features
Y _{Calibrated directly in Celsius (Centigrade)}
Y _Linear a _{10 0 mV C scale factor}
Y _{0 5 C accuracy guaranteeable (at} a_{25 C)}
Y _{Rated for full} b_{55 to} a_{150 C range}
Y _{Suitable for remote applications}
Y _{Low cost due to wafer-level trimming}
Y _{Operates from 4 to 30 volts}
Y _{Less than 60 mA current drain}
Y _{Low self-heating 0 08 C in still air}
Y _{Nonlinearity only} g _{C typical}
Y _{Low impedance output 0 1 X for 1 mA load}
Connection Diagrams
TO-46
Metal Can Package
TO-92
Plastic Package
SO-8
Small Outline Molded Package
TL H 5516–1
Case is connected to negative pin (GND)
Order Number LM35H LM35AH
LM35CH LM35CAH or LM35DH
See NS Package Number H03H
TO-202
Plastic Package
TL H 5516 – 2
Order Number LM35CZ
LM35CAZ or LM35DZ
See NS Package Number Z03A
Typical Applications
TL H 5516 – 21
Top View
N C e No Connection
Order Number LM35DM
See NS Package Number M08A
TL H 5516 – 3
FIGURE 1 Basic Centigrade
Temperature
Sensor (a2 C to a150 C)
TL H 5516–24
Order Number LM35DP
See NS Package Number P03A
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 5516
TL H 5516 – 4
Choose R₁ e bV_S 50 mA
V_OUTe a1 500 mV at a150 C
e a250 mV at a25 C
eb550 mV at b55 C
FIGURE 2 Full-Range Centigrade
Temperature Sensor
RRD-B30M75 Printed in U S A