What is the correct circuit symbol for a thermistor?

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Discussion Overview

The discussion revolves around the correct circuit symbol for a thermistor, exploring various representations and their acceptability. Participants share their experiences and preferences regarding the symbols used in circuit diagrams.

Discussion Character

  • Debate/contested, Technical explanation

Main Points Raised

  • Some participants note variations in the circuit symbol for thermistors, questioning whether there is a fixed or universally accepted version.
  • One participant expresses familiarity with a version of the symbol that has a horizontal line at the bottom left rising to the top right, while another mentions a version that rises to the top left.
  • A participant indicates a preference for a symbol resembling a resistor with an arrow through it, associating it with thermistors, and cites Vishay's use of this symbol.
  • Another participant mentions the practice of enclosing the thermistor symbol in a circle and annotating it with the resistance at a specific temperature.
  • One participant corrects a previous statement regarding the orientation of the line in the symbol.
  • There is a mention of confusion regarding the symbol for metal-oxide varistors (MOVs) and its distinction from thermistors.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a single correct symbol for thermistors, indicating multiple competing views on the matter.

Contextual Notes

Participants express uncertainty regarding the standardization of symbols and the potential for different interpretations based on personal or regional practices.

Who May Find This Useful

Individuals interested in circuit design, electrical engineering, or those studying electronics may find this discussion relevant.

xunxine
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I came across a few variations of the circuit symbol for thermistor. I've attached one below.
I'm more used to the version with horizontal line at bottom left and rise to the top right. Is there any fixed or correct version? Or are all equally correct? i.e. the orientation of the line doesn't matter?
 

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xunxine said:
I came across a few variations of the circuit symbol for thermistor. I've attached one below.
I'm more used to the version with horizontal line at bottom left and rise to the top left. Is there any fixed or correct version? Or are all equally correct? i.e. the orientation of the line doesn't matter?

I use that symbol for MOVs (metal-oxide varistors for surge clamping). I prefer more of a resistor symbol with an arrow through it for a thermistor.

Vishay seems to use that symbol for their thermistors, though.
 
Seems like we always drew a circle around it and made a note of the resistance @ temp.
 
Corrected above: I'm more used to the version with horizontal line at bottom left and rise to the top right.

For the diagram of resistor with an arrow through it, i learned it as a variable resistor or rheostat.
I didn't know there's a symbol for MOVs.
 

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