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# Thermistor symbol

Posted on 2006-05-29
Medium Priority
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I've seen 2 different (but very similar) drawings for the thermistor.

Here's one:

In this one, the flat line is above the resistor component, but on others, it's below.

I'm guessing which one it is, indicates whether or not it has a PTC or an NTC.

Is the one in the above image a PTC or NTC?

Thanks
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Question by:InteractiveMind

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Accepted Solution

JR2003 earned 200 total points
ID: 16786426
There isn't a difference in the symbol of a PTC and NTC thermistor.
If there were the diagram would do a different thing if you read it upside down.
http://www.iee.org/EduCareers/Schools/symbols.pdf
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LVL 27

Expert Comment

ID: 16787038
There is no symbol which EVERYBODY uses for a thermistor. The one you showed is quite common. Another is the usual resistor symbol enclosed in a circle with a T placed inside.
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Author Comment

ID: 16788310
Cheers
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