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Old 06-16-2022, 04:16 PM   #1
connorcc2005
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Default 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.
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File Type: jpg TTC 104.jpg (582.0 KB, 6 views)
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Old 06-16-2022, 05:02 PM   #2
petehall347
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Default Re: Thermistor specs and cross reference

100k according to internet .. ntc thermistor .
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Old 06-16-2022, 05:52 PM   #3
stj
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Default Re: Thermistor specs and cross reference

104 = 100,000 = 100k
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Old 06-16-2022, 05:55 PM   #4
R_J
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Default 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 at 06:06 PM..
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Old 06-21-2022, 07:32 AM   #5
connorcc2005
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Default 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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Old 06-21-2022, 09:20 AM   #6
R_J
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Default Re: Thermistor specs and cross reference

I think this is the datasheet with curve for only the ttc-104
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File Type: pdf 2102011838_TKS-TTC05104JSE507_C2687424.pdf (222.1 KB, 6 views)
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Old 06-21-2022, 04:04 PM   #7
connorcc2005
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Default Re: Thermistor specs and cross reference

Wow, this is great. Thank you.
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