The V-I characteristics of NTC thermistors are shown in Figure 4.
As the current value is gradually increased, in the small current area, the voltage also gradually increases as the ohmic contact. Self-heating due to current is dissipated from the surface of the thermistor, and the temperature does not rise. However, when the amount of heat generated increases, the temperature of NTC thermistor body rises and the resistance value decreases. In this area, the proportional relationship between current and voltage no longer holds.
Normally, NTC thermistor is used in an area where this self-heating is suppressed as much as possible. As a guideline, it is recommended that the maximum operating current or less be used.
Use in the area beyond the voltage peak can result in a thermal runaway area where heat generation and resistance decrease occur repeatedly. Thermal runaway causes the thermistor to become red hot and may be damaged, so please do not use it.