| 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 Centigrade scaling.
The LM35 does not require any external calibration or trimming to provide
typical accuracies of ±¼°C at room temperature and ±¾°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 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 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-220 package. |