PTC thermistors
Nonlinear temperature-dependent resistance for thermal protection using semiconductor ceramics

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E2080 V2 Article

PTC thermistors
Nonlinear temperature-dependent resistance for thermal protection using semiconductor ceramics

Authors : Alain BEAUGER , Alain LAGRANGE

Review date: October 14, 2026 | Lire en français

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3. PTC thermistors

3.1 Conductivity origin

PTC thermistors are ferroelectric, semiconducting ceramics. They exhibit an "anomaly" in the variation of their resistance at the Curie temperature TC of the material corresponding to the ferro-para-electric transition temperature. Above this temperature (see figure 2), resistance rises sharply (in the order of 10 to 100% / °C), then reaches a maximum before decreasing. In other words, the thermistor changes from a conductive to an insulating state within a few tens...

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