Thermistor's main parameters

The main parameters of power thermistor are: steady-state current, R25 resistance, energy dissipation coefficient, B value, etc.

1. Steady-state current: Refers to the large continuous current value that the thermostor is allowed to apply to the thermostor at an ambient temperature of 25 ° C. This value must be higher than the thermistor operating current in the actual circuit.

2. R25 resistance: refers to the designed resistance of the thermostor, that is, the zero-power resistance at 25 ° C (usually the accuracy of the resistance is about 20%). This value can represent the thermostat's current limiting ability at the moment of startup.

3. B value: is the thermal coefficient, which is the ratio of the difference between the natural logarithm of the zero-power resistance value at two temperatures and the difference between the inverse of the two temperatures (see the thermistor temperature characteristic formula). The larger the B value, the smaller the residual resistance and the smaller the operating temperature rise.

4. Energy dissipation coefficient: It refers to the ratio of the power dissipation change of the device itself to the corresponding temperature change at the specified ambient temperature.

5. Thermal response time: refers to the time value of 63.2% of the time it takes to start and end thermistor surface temperature when the temperature suddenly changes under zero power conditions In general, the larger the product of the thermal response time and the energy dissipation coefficient, the larger the thermal capacity of the themistor, and the stronger the ability to stop inrush current.

There are 12 detailed parameters of thermistor. This article introduces its main parameters. If you have technical questions, please contact us and try our best to solve them.