SNIS160D – MAY 1999 – REVISED MARCH 2013
LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors
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FEATURES
Directly Calibrated in °Kelvin
1°C Initial Accuracy Available
Operates from 400
μA
to 5 mA
Less than 1Ω Dynamic Impedance
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Easily Calibrated
Wide Operating Temperature Range
200°C Overrange
Low Cost
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 1Ω 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 transistor packages while the LM335 is also available in plastic TO-92 packages.
Schematic Diagram
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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