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.
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|Local Sensor Accuracy (Max) (+/- C)|
|Temp Range for Listed Accuracy (C)|
|Sensor Gain (mV/Deg C)|
|Output Impedance (Ohm)|
|Supply Voltage (Min) (V)|
|Supply Voltage (Max) (V)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
|25||20 to 40||20 to 40|
|10||-5.5 to 13.6||-5.5 to 13.6|
|Selectable gain setting||Selectable gain setting|
|-40 to 100||-50 to 150||-50 to 150|
| 3TO |
|0.37 | 1ku||0.53 | 1ku|
|Sample & Buy||Sample & Buy||Sample & Buy|