How to select a NTC(Thermistor) ?

Discussion in 'General Electronics Chat' started by sneha.123, Jun 11, 2014.

  1. sneha.123

    Thread Starter New Member

    Jun 11, 2014
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    Hello
    I Have a design that needs to have very low resistance 0.2 ohms at -25 deg.Can i get help on how to select the same.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,734
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    Hello sneha. Welcome.

    I am sorry I haven't yet seen one but may be other members had. Give it some time for others to respond.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Think the lowest ntc is a 2k2 @ 25C, ntcs go higher in resistance with lower temps, what is the design for?
     
  4. sneha.123

    Thread Starter New Member

    Jun 11, 2014
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    It is used to to see when the cooling ability of the system breaks down.By knowing the power the system can withstand the resistance is calculated to 0.2ohms.I need to select the NTC accordingly.
     
  5. #12

    Expert

    Nov 30, 2010
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    I can bid at .7 ohms, but better to post the literature.
     
  6. sneha.123

    Thread Starter New Member

    Jun 11, 2014
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    Thanks for the inputs.I will check if these suit my application.
     
  7. pwdixon

    Member

    Oct 11, 2012
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  8. sneha.123

    Thread Starter New Member

    Jun 11, 2014
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    Yes my application is for temp measurement and not circuit protection.
     
  9. pwdixon

    Member

    Oct 11, 2012
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    Why must the thermistor be such a low value? Normally in most measurement scenarios people want to have a large thermistor value to reduce self heating and save power on the measurement system itself.
     
  10. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Ummm...not always. Driven with a constant current, lower R results in proportionally less power, as P=IR.

    OTH, I am not sure the OP understands what he really needs. 0.2 ohms at -25C to seems quite unusual.
     
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