What is NTC thermistor PTC thermistor.PVC magnifier bookmark

　　NTC:

　　NTC is the abbreviation of NegativeTemperatureCoefficient, which means negative temperature coefficient. It generally refers to semiconductor materials or components with a large negative temperature coefficient. The so-called NTC thermistor is a negative temperature coefficient thermistor.

　　In order to avoid the surge current generated at the moment of power-on in the electronic circuit, a power NTC thermistor is connected in series in the power supply circuit, which can effectively suppress the surge current during power-on, and after the suppression of surge current is completed , due to the continuous action of the current through it, the resistance value of the power NTC thermistor will drop to a very small level due to the rise in temperature, the power it consumes can be ignored, and it will not affect the normal working current, so , The use of a power NTC thermistor in the power circuit is the most simple and effective measure to suppress the surge during startup and to ensure that electronic equipment is not damaged.

　　PTC:

　　PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient, which generally refers to semiconductor materials or components with a large positive temperature coefficient. Usually the PTC we refer to refers to the positive temperature coefficient thermistor, referred to as the PTC thermistor. PTC thermistor is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain temperature (Curie temperature), its resistance value increases in steps with the increase of temperature.

　　When the circuit is working normally, the temperature of the thermistor is close to the room temperature and the resistance is very small, and the series connection in the circuit will not hinder the flow of current. When the temperature exceeds the switch temperature, the resistance will suddenly increase sharply, and the current in the loop will quickly decrease to a safe value. After the thermistor operates, the current in the circuit has been greatly reduced. Due to the good designability of the polymer ptc thermistor, its sensitivity to temperature can be adjusted by changing its own switching temperature (ts). At the same time, it has two functions of over-temperature protection and over-current protection.

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