NTC Thermistor

This is a Negative Temperature Coefficient Resistor whose resistance changes with ambient temperature changes. Thermistors comprise 2 or 4 kinds of metal oxides of iron, nickel, cobalt, manganese, and copper, being shaped and sintered at high temperature (1200C to 1500C).

Critical Technical Parameters of NTC Thermistor

• Rt: Resistance Value at Zero-power. It's a resistance obtained at a fixed temperature based on a testing power that causes resistance to vary within a range that can be ignored in relation to the total testing error.
• R25: Resistance Value at Rated Zero-power. The design resistance of the thermistor usually refers to the resistance value obtained at zero-power at 25C, which is usually indicated on the thermistor.
• Max. steady state current (Imax): The maximum allowable continuous current passing through the thermistor at 25C.
• Dissipation Coefficient (): It's the ratio of the changes in thermistor dissipation power, in a pre-set ambient temperature, to the changes in temperature. The formula is as below: = P / T. It changes in response when the ambient temperature changes within the ranges of the working temperature.

Applications

Conversion power supply, switch power, UPS power, various electric heaters, electronic energy-saving lamps, electronic ballasts, etc. All kinds of power circuit protection of electronic equipment, filament protection of CRT, bulb, and other lighting lamps.