Fig 4. Infulence of frequency on PTC Thermistor RT charcterisitics.
Ceramic PTC Thermistors Voltage vs. Current characteristic
The properties of electrically loaded PTC thermistors (in self-heated mode) are better described by the I/V characteristic than by the R/T curve (see figure 4). It illustrates the relationship between voltage and current in a thermally steady state in still air at 25C, unless another temperature is specified.