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Product Attributes

Introduction

NTC (Negative Temperature Coefficient) thermistors are resistors whose resistance decreases as temperature rises. The change in resistance can be caused either externally by a change in ambient temperature or internally by self-heating resulting from a current flowing through the device. This predictable change in resistance as a function of temperature is the basis for all thermistor applications. NTC (Negative Temperature Coefficient) thermistors are resistors with large negative temperature coefficient. Change in resistance of the NTC thermistors can be brought about either externally by a change in ambient temperature or internally by self-heating resulting from a current flowing through the device. This predictable change in resistance as temperature changes is the basis for all applications of thermistors. NTC thermistors are a type of semiconductor, typically formed by sintering transition metal oxides composed of Mn, Co, Ni, Cu, Fe, etc., into various shapes and sizes. By varying the composition of elements in the semiconductor and the bulk dimensions, resistance values at room temperature can range from 1Ω to 10⁶Ω, with temperature coefficients ranging from -2%/℃ to -6.5%/℃. The semiconducting material of NTC thermistors usually consists of a sintered ceramic fabricated in a variety of shapes and sizes from a mixture of oxides chosen from Mn, Co, Ni, Cu, Fe and etc....By varying the composition and the size of the semi-conducting elements, resistance values between 100 and 10⁶ ohms at room temperature can be achieved with temperature coefficients lying between -2% to -6.5% per ℃。

Applications

• Inrush Current Suppression In electronic circuits containing capacitors, bulb filaments, fluorescent lamp inverters, heaters, and similar components, the zero-power resistance of NTC thermistors suppresses inrush current at the moment of power-on. Once suppression is complete, the thermistor resistance drops to a very low level, allowing normal operating current to flow without affecting circuit operation. If circuits consist of capacitor, bulb filament, heater, or inverter for fluorescent lamp, zero - power resistance of NTC thermistor limits the surge current during initial turn - on, and then its resistance is reduced to a very low level and allows operating current to flow during normal operation.