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Thermistor specs and cross reference

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    Thermistor specs and cross reference

    Hi,

    I'm getting some conflicting information and thought I'd toss it out to all of you for input.
    What I have is a TTC-104 thermistor. This is part of a temp sense circuit that will drive a small 12v fan to cool components mounted to SMPS heat sink.
    The physical diameter of the piece is 5.1mm measured with a caliper.
    Other than what you see in the pic, there is no other writing on the part.

    My research of the TTC-104 says it should read 100 ohms at 25C. Out of circuit measurements have it at approximately 100k. It does change as the temp changes. What I'm wondering, is the 100 ohms at 25C value correct?
    Granted, being mounted to the heat sink it has seen its share of heat during its 12 years of service so maybe the whole issue is that the part has drifted out of spec? If this is the case, what is a suitable replacement for a TTC-104 as I have not been able to cross reference it?
    Thanks for all help and responses.
    Attached Files

    #2
    Re: Thermistor specs and cross reference

    100k according to internet .. ntc thermistor .

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      #3
      Re: Thermistor specs and cross reference

      104 = 100,000 = 100k

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        #4
        Re: Thermistor specs and cross reference

        I agree, 100k. According to the datasheet TTC-005 = 5Ω, TTC-101 = 100Ω etc. On the next page it seems wrong and should likely be (KΩ) TTC-102 = 1Ω? likely should be 1K so TTC-104 should be 100K
        If you look at the TSM1A-104 100 (KΩ) on this page they got it right
        Last edited by R_J; 06-16-2022, 06:06 PM.

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          #5
          Re: Thermistor specs and cross reference

          Thank you All for confirming the details of this part. If anyone has a legible R-T curve for the TTC-104, please post it or send it to me in a PM. All the datasheets I've seen are so out of focus, you can't read them.

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            #6
            Re: Thermistor specs and cross reference

            I think this is the datasheet with curve for only the ttc-104
            Attached Files

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              #7
              Re: Thermistor specs and cross reference

              Wow, this is great. Thank you.

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