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linear thermistors

Varaprasad Rayudu
Prodigy 150 points

Does any part# of linear thermistors exhibits NTC behaviour ?

Please help me to find the formulas used in the "Thermistor Design Tool" for sensitivity, Power handling and R/div.,etc .

Does these parts available for space level screening as per MIL-PRF-321921?

  • 0
    TI__Genius 9380 points

    all of our linear thermistors have a positive temperature coefficient. The normal way to design in one of our thermistors is with an Rbias resistor on top of a voltage divider. However is you reverse the divider circuit and place the thermistor on top and the Rbias resistor on bottom, the output will be a linear negative temperature coefficient. you can also reverse an NTC and get a positive temperature coefficient response.

      

    Most of the formulas are basic ohms law type of formulas. Sensitivity is just measuring the delta resistance between 1C temperature steps.

    Power is P=V*I, the current is determined by determining the resistance of the thermistor, then add that to the Rbias resistance for a total series resistance. Then I=V/R. Divider resistance is Vdiv=Vcc - (Rbias * I).

    At this time we do not have a space certified thermistor.