The
LM35 series are precision integrated-circuit temperature devices with
an output voltage linearly-proportional to the Centigrade temperature.
The LM35 device has an advantage over linear temperature sensors
calibrated in Kelvin, as the user is not required to subtract a large
constant voltage from the output to obtain convenient Centigrade
scaling. The LM35 device 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°C to 150°C temperature range. Lower cost is assured
by trimming and calibration at the wafer level. The low-output
impedance, linear output, and precise inherent calibration of the LM35
device makes interfacing to readout or control circuitry especially
easy. The device is used with single power supplies, or with plus and
minus supplies. As the LM35 device draws only 60 µA from the supply, it
has very low self-heating of less than 0.1°C in still air. The LM35
device is rated to operate over a −55°C to 150°C temperature range,
while the LM35C device is rated for a −40°C to 110°C range (−10° with
improved accuracy). The LM35-series devices are available packaged in
hermetic TO transistor packages, while the LM35C, LM35CA, and LM35D
devices are available in the plastic TO-92 transistor package. The LM35D
device is available in an 8-lead surface-mount small-outline package
and a plastic TO-220 package.
