'ntc热敏电阻器系列
ntc热敏电阻的基本电气特性是它们随温度变化而改变电阻。即在一定的测量功率下，电阻值与环境温度或自身温度具有相对应的关系，利用这一特性，将ntc热敏电阻器用在电子线路上通过其电阻值的变化来确定相应温度的变化，以达到测温和控温的目的。我公司生产的热敏电阻因其灵敏度高、性能稳定、价格低廉，能满足任何高精度的电子测温控温要求及电子线路的温度补偿需要。
ntc thermistor is a negative temperature coefficient component which its resistance will be decreased along with the increasing temperature. it is for temperature detection and control of household appliances and so on.
they are made from semiconducting materials that usually consists of a sintered ceramic fabricated in a variety of shapes and sizes from a mixture of oxides chosen from the elements mn, nj, co, cu and fe. by varying the composition and the size of the semiconducting elements, resistance values between 100 and 106ohms at room temperature can be achieved.
the fields of ntc thermistor applications are temperature sensing either for the purpose of temperature measurement, temperature control, thermal alarms or for the compensation of changes in circuit resistance brought about by variations in the ambient temperature.
parameters definiton
zero-power resistance(rt)the zero-power resistance is the direct current resistance value of a thermistor measured at a specified temperature(t)with a power dissipation by the thermistor low enough that any further decrease in power will result in less than0.1 percent change in resistance
material constant(b)the thermal constant of a ntc thermistor is a measure of its resisrance at one temperature compared to its resistance at a different temperature it value may be calculated by the formula shown blow and is expressed in degrees kelvin the reference temperature used in this formula for determining material
b=ln(r1/ r2)/(1/t1-1/t2)
thermal time constantthe thermal time constant is the time required for a thermistor to change63.2 percent of total diference between its initial and final body temperature when subjected to a step function change in ambient temperature under zero-power condition and is normally expressed in second.
thermal dissipation coefficientthe thermal dissipation coefficient is the ratio ,normally expressed in milliwatts per degree c(mw/℃),
at a specified ambient temperature, of a change in power dissipation in a thermistor to the resultant body temperature change
maximum steady-state current(imax)the maximum steady-state current is the rating of the maximum current ,normally expressed in amperes(a), allowable to be conducted by an inrush limiting ntcthermistor for an extended period of time.
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深圳市深思泰电子科技有限公司
张心旺
18926595968
竹坑第三工业区四栋四楼