What is a negative temperature coefficient thermistor ( NTC )?
The thermistor is a temperature measuring element made of semiconductor material, and the thermal sensitive material is mixed with manganese, nickel, cobalt and other metal oxide powder in a certain proportion at present, the positive temperature coefficient thermistor and the negative temperature coefficient thermistor are widely used.
The resistance of negative temperature coefficient thermistor ( NTC ) decreases with the increase of temperature, which is of high sensitivity, small volume and rapid reaction speed, easy to use. The negative temperature coefficient thermistor ( NTC ) has a variety of packaging forms and can be easily applied to various circuits.
The main parameters of the negative temperature coefficient thermistor ( NTC ) are :
( 1 ) nominal resistance Rt nominal resistance value also known as zero power resistance, resistance at ambient temperature of 25℃. That is, the resistance value on the component.
( 2 ) The rated power thermistor is called the rated power under the specified technical conditions, the allowable consumption power of the long-term continuous load. The normal power rating given is the rated power at + 25℃.
( 3 ) The time constant refers to 63. 2 % of the difference between the temperature of the resistor and the final temperature when the ambient temperature is mutated in the reactive power state the time required is also called thermal inertia.
( 4 ) The dissipation factor is the power consumed by the thermistor when the temperature drops by 1 °C.
( 5 ) the range of voltage regulation refers to the operating voltage range of the voltage stabilizing NTC thermistor.
( 6 ) Resistance temperature coefficient At the condition of zero power, the relative change of resistance value caused by each change in temperature is % / °C.
( 7 ) Measurement of power. It refers to the consumption of resistance at a specified ambient temperature not exceeding 0.1 % of the resistance value caused by the heating of the measuring power supply power. Its purpose is to unify the test standard and the basis for designing the test instrument.
This article is from ALLICDATA ELECTRONICS LIMITED.