Document
LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors
May 1999
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 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-46 transistor packages while the LM335 is also available in plastic TO-92 packages.
Features
n n n n n n n n Directly calibrated in ˚Kelvin 1˚C initial accuracy available Operates from 400 µA to 5 mA Less than 1Ω dynamic impedance Easily calibrated Wide operating temperature range 200˚C overrange Low cost
Schematic Diagram
DS005698-1
© 1999 National Semiconductor Corporation
DS005698
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Connection Diagrams
TO-92 Plastic Package SO-8 Surface Mount Package TO-46 Metal Can Package*
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Bottom View Order Number LM335Z or LM335AZ See NS Package Number Z03A
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*Case is connected to negative pin
Order Number LM335M See NS Package Number M08A
Bottom View Order Number LM135H, LM135H-MIL, LM235H, LM335H, LM135AH, LM235AH or LM335AH See NS Package Number H03H
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Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Storage Temperature TO-46 Package TO-92 Package SO-8 Package 15 mA 10 mA −60˚C to +180˚C −60˚C to +150˚C −65˚C to +150˚C
Specified Operating Temp. Range Continuous LM135, LM135A −55˚C to +150˚C LM235, LM235A −40˚C to +125˚C LM335, LM335A −40˚C to +100˚C Lead Temp. (Soldering, 10 seconds) TO-92 Package: TO-46 Package: SO-8 Package: Vapor Phase (60 seconds): Infrared (15 seconds): Intermittent (Note 2) 150˚C to 200˚C 125˚C to 150˚C 100˚C to 125˚C 260˚C 300˚C 300˚C 215˚C 220˚C
Temperature Accuracy (Note 1)
LM135/LM235, LM135A/LM235A Parameter Operating Output Voltage Uncalibrated Temperature Error Uncalibrated Temperature Error Temperature Error with 25˚C Calibration Calibrated Error at Extended Temperatures Non-Linearity IR = 1 mA 0.3 0.5 0.3 1 ˚C TC = TMAX (Intermittent) 2 2 ˚C Conditions TC = 25˚C, IR .