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What happens with the resistance in an NTC component?
NTC Thermistors are non-linear resistors, which alter their resistance characteristics with temperature. The resistance of NTC will decrease as the temperature increases. The manner in which the resistance decreases is related to a constant known in the electronics industry as beta, or ß. Beta is measured in °K.
What does thermistor resistance depend on?
A thermistor is a resistance thermometer, or a resistor whose resistance is dependent on temperature. The term is a combination of “thermal” and “resistor”. It is made of metallic oxides, pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass.
What is the function of NTC thermistor?
NTC thermistors are resistors with a negative temperature coefficient, which means that the resistance decreases with increasing temperature. They are primarily used as resistive temperature sensors and current-limiting devices.
Why do thermistors decrease resistance?
Their resistance decreases as the temperature increases. At low temperatures, the resistance of a thermistor is high, and little current can flow through them. At high temperatures, the resistance of a thermistor is low, and more current can flow through them.
The general rule is resistivity increases with increasing temperature in conductors and decreases with increasing temperature in insulators. As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up.
What does a negative temperature resistance NTC thermistor do?
NTC thermistors are resistors with a negative temperature coefficient, which means that the resistance decreases with increasing temperature. They are primarily used as resistive temperature sensors and current-limiting devices.
What does NTC stand for in resistor category?
NTC stands for “Negative Temperature Coefficient. NTC thermistors are resistors with a negative temperature coefficient, which means that the resistance decreases with increasing temperature. They are primarily used as resistive temperature sensors and current-limiting devices.
What is the temperature coefficient of a NTC?
For example, the temperature coefficient of un-doped silicon is −0.075 K -1 at 20 °C. Even if silicon is used as temperature sensor, NTCs are usually constructed with metal oxides, shaped and sintered together, and have even higher temperature coefficients.
Which is better NTC thermistor or platinum alloy RTD?
As can be seen from the figure, the NTC thermistors have a much steeper resistance-temperature slope compared to platinum alloy RTDs, which translates to better temperature sensitivity.