LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors

LM135/LM235/LM335, LM135A/LM235A/LM335A
Precision Temperature Sensors

General Description
The LM135 series are precision, easily-calibrated, integrated
circuit temperature sensors. Operating as a 2-terminal zener,
the LM135 has a breakdown voltage directly proportional to
absolute temperature at +10 mV/°K. With less than 1W dynamic
impedance the device operates over a current range
of 400 μA to 5 mA with virtually no change in performance.
When calibrated at 25°C the LM135 has typically less than
1°C error over a 100°C temperature range. Unlike other
sensors the LM135 has a linear output.
Applications for the LM135 include almost any type of temperature
sensing over a −55°C to +150°C temperature
range. The low impedance and linear output make interfacing
to readout or control circuitry especially easy.
The LM135 operates over a −55°C to +150°C temperature
range while the LM235 operates over a −40°C to +125°C

temperature range. The LM335 operates from −40°C to
+100°C. The LM135/LM235/LM335 are available packaged
in hermetic TO-46 transistor packages while the LM335 is
also available in plastic TO-92 packages.

Features

n Directly calibrated in °Kelvin
n 1°C initial accuracy available
n Operates from 400 μA to 5 mA
n Less than 1W dynamic impedance
n Easily calibrated
n Wide operating temperature range
n 200°C overrange
n Low cost

Click here to download LM313 National Semiconductor pdf datasheets 

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