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Precision Temperature Sensor
National Semiconductor

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 1Ohm dynamic impedance the device operates over a current range of 400 ?A to 5 mA with virtually no change in performance. When calibrated at 25C the LM135 has typically less than 1C error over a 100C temperature range. Unlike other sensors the LM135 has a linear output. Applications for the LM135 include almost any type of temperature sensing over a -55C to +150C temperature range. The low impedance and linear output make interfacing to readout or control circuitry especially easy. The LM135 operates over a -55C to +150C temperature range while the LM235 operates over a -40C to +125C temperature range. The LM335 operates from -40C to +100C. The LM135/LM235/LM335 are available packaged in hermetic TO-46 transistor packages while the LM335 is also available in plastic TO-92 packages.

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

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