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1、 EXSENSE Electronics Technology Co., Ltd. 愛晟電子科技有限公司 1 NTC熱敏電阻器的主要技術參數 Basic Characteristics of NTC ThermistorNTC: Negative Temperature Coefficient 負溫度係數 Thermistor: Thermally Sensitive Resistor 熱敏電阻 A 非線性的溫度特性 Nonlinear temperature B Y軸為對數座標時，非常接近實際的溫度特性 Close to real temp. while Y axis as log coor
2、dinates NTC特性: NTC的阻值隨溫度升高而迅速減小。 Exhibit a decrease in resistance when temperature rises. NTC熱敏電阻是一種以過渡金屬氧化物為主要原材料經高溫燒結而成的半導體陶瓷元件，它具有非常大的負溫度係數，電阻值隨環境溫度或因通過電流而產生自熱而變化，即在一定的測量功率下，電阻值隨著溫度上升而迅速下降。利用這一特性，可將NTC熱敏電阻通過測量其電阻值來確定相應的溫度，從而達到檢測和控制溫度的目的。 Thermistor is a semiconducting ceramic resistor produced by
3、 sintering the materials at high temperature and made mainly from metal oxide. NTC 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-heatin
4、g resulting from a current flowing through the device. At certain measure power, its resistance reduces rapidly while the temperature getting increases. Taking advantage of this characteristic, it can achieve the detecting and controlling temperature purpose. 1、 零功率電阻值RT Zero-power resistance (RT) 在
5、規定溫度下，採用引起電阻變化相對於總的測量誤差來說可以忽略不計的測量功率測得的電阻值。 The zero-power resistance is the value of a resistance when measured at a specified temperature, under conditions such that the change in resistance due to the internal generation of heat is negligible with respect to the total error of measurement. 2、 零功率
6、電阻R25 Rated zero-power resistance R25指25時測得的零功率電阻值。除非特別指出，它是熱敏電阻器的設計電阻值，也是標稱電阻值。 The rated zero-power resistance is the nominal value at the standard temperature of 25 unless otherwise specified. 3、 B值 B constance in Kelvins (K) B值是負溫度係數熱敏電阻器的熱敏指數，它被定義為兩個溫度下零功率電阻值的自然對數之差與兩個溫度倒數之差的比值。 B constance is
7、an index of the thermal sensitivity expressed by the formula: RT1-溫度為T1時的零功率電阻Resistance in ohms ( ) at temperature T1 RT2-溫度為T2時的零功率電阻值Resistance in ohms ( ) at temperature T2 T1=2731.5k +( T1), T2=2731.5k+ (T2) 除非特別指出，B值是由25（298.15K）和50（323.15K）的零功率電阻值計算而得到的，B值在工作溫度範圍內並不是一個嚴格的常數。 The B constance,
8、unless otherwise specified, is calculated using the zero-power resistance when 25 and 50 in environment temperature. EXSENSE Electronics Technology Co., Ltd. 愛晟電子科技有限公司 2 4、 耗散係數 Dissipation factor() =P/T (mW/) 即：在規定的環境溫度下，熱敏電阻器耗散功率變化率與其相應溫度變化之比。它表示使熱能電阻體升高1溫度所需消耗的功率。在工作溫度範圍內，隨環境溫度變化而有所變化。 Dissipati
9、on factor () is power in milliwatts required to raise thermistor temperature 1, measured with thermistor suspended by its leads in a specified environment. 5、 熱時間常數 Thermal time constance () 在零功率條件下，當溫度發生突變時，熱敏電阻體溫度變化了始末溫度差 的63.2%所需的時間。與熱敏電阻器的熱容量C成正比，與其耗散係數 成反比，即： =C/ Thermal time constance () is th
10、e time required by a thermistor to change 63.2% of the difference between its initial and final temperature, measured with thermistor suspended by its leads in specified environment. 6、 額定功率Pr Power rating 額定功率=耗散係數（最高使用溫度Tmax25） Rated power = heat dissipation factor (maximum operating temperature 2
11、5) 7、 阻溫特性 Resistance/temperature characteristic The resistance law of the relationship between the zero-power resistance of a thermistor and its body temperature follows approximately the formula: 熱敏電阻的阻值隨溫度變化的規律，大體如下： R1：在絕對溫度T1(K)下的阻值 Resistance value at absolute temperature T1 (K) B：B常數 B constance T(K)=T()+273.15 (1) B值相同，阻值不同 (2) 相同阻值，B值不同 The same B constance while the different resistances The same resistance while the different B constances
