Classification of thermistors Identification of thermistors

　　1. Rated zero-power resistance R25 zero-power resistance means that when the PTC thermistor value is measured at a certain temperature, the power consumption added to the PTC thermistor is extremely low, so low that the PTC thermistor caused by its power consumption The resistance change of the resistor is negligible. The rated zero-power resistance refers to the zero-power resistance value measured at an ambient temperature of 25°C.

　　2. Curie temperature Tc For the application of PTC thermistor, the temperature at which the resistance value begins to rise steeply is important, and we define it as the Curie temperature. The resistance of the PTC thermistor corresponding to the Curie temperature RTc=2*Rmin.

　　3. Temperature Coefficient The temperature coefficient of αPTC thermistor is defined as the relative change of resistance caused by temperature change. The larger the temperature coefficient, the more sensitive the PTC thermistor is to temperature changes. α=(lgR2-lgR1)/lge(T2-T1)

　　4. Rated voltage VN The rated voltage is the power supply voltage below the working voltage Vmax. Usually Vmax=VN+15%

　　5. Breakdown voltage VD The breakdown voltage refers to the voltage withstand capability of the PTC thermistor. PTC thermistors will fail at breakdown above the breakdown voltage.

　　6. Surface temperature Tsurf The surface temperature Tsurf refers to the temperature of the surface of the PTC thermistor when the PTC thermistor is in a state of thermal equilibrium with the surrounding environment for a long time at a specified voltage.

　　7. The operating current Ik is the current flowing through the PTC thermistor, which is enough to make the self-heating temperature rise of the PTC thermistor exceed the Curie temperature. Such a current is called the operating current. The value of the operating current is called the operating current.

　　8. The non-operating current INk flows through the current of the PTC thermistor, which is not enough to make the self-heating temperature rise of the PTC thermistor exceed the Curie temperature. Such a current is called the non-operating current. The value of the dead current is called dead current.

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