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I want to find a temperature sensor able to be used from -80 °C to 20 °C, measuring air temperature, with a potentially low pressure, reaching 1 kPa. Another constraint is that it should be as small as possible (a thermistor or TO-92 is small enough, though). Finally, its accuracy should be around 0.5 - 1 °C.

However, all the sensors I've found (mainly thermistors, and chips like the TI LMT87 or Tsic301) are only said to work in temperature above -50 °C.

What sensor could I use ?

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You could use a platinum RTD like the PPG102A6. This has a temperature range of -200C to 600C with an accuracy of +/-0.15C

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For that temperature range, I would suggest either a type T (Copper-Constantan) thermocouple or a platinum RTD. (100 or 1000 ohms).

Thermocouples are vastly more rugged and usually are much faster response but require signal conditioning (including cold-junction compensation). RTDs are more accurate and (electrically) easier to use.

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