LM135_08 Datasheet, PDF (1/16 Pages) STMicroelectronics – Precision temperature sensors

December 17, 2008
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 dy-
namic 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 tem-
perature 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 tem-
perature range. The LM335 operates from −40°C to 100°C.
The LM135/LM235/LM335 are available packaged in hermet-
ic TO-46 transistor packages while the LM335 is also avail-
able in plastic TO-92 packages.
Features
■ ^{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
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