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Thermistors? #129196
10/04/04 11:41 PM
10/04/04 11:41 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,260
SI,New Zealand
What sort of materials are PTC and NTC Thermistors made from?.
Also is their Temperature/Resistance response a linear thing, or does the resistance rise/fall at a logarithmic rate?
You help would be most appreciated. [Linked Image]

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Re: Thermistors? #129197
10/04/04 11:59 PM
10/04/04 11:59 PM
W
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
Thermistors are made of various semiconductor materials. They are very much _not_ linear.

Take a look at these guys for datasheets, including resistance versus temperature tables.
http://www.vishay.com/thermistors/ptc/
http://www.vishay.com/thermistors/ntc/

-Jon

Re: Thermistors? #129198
10/05/04 07:59 AM
10/05/04 07:59 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Definitely NOT linear, nor would we want them to be in many applications.

The exact curve isn't necessarily purely logarithmic either. Different types can be formulated to have varying characteristics to suit the intended application.

Re: Thermistors? #129199
10/07/04 10:59 AM
10/07/04 10:59 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,260
SI,New Zealand
Thanks for the info, guys.
I was just wondering about these devices, having never had much to do with them in the past.
And I most certainly didn't know that they were made of semi-conductor materials. [Linked Image]


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