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## N_06U00224 Datasheet(PDF) 4 Page - AVX Corporation

 Part No. N_06U00224 Description NTC Thermistors Download 38 Pages Scroll/Zoom 100% Maker AVX [AVX Corporation] Homepage http://www.avx.com Logo

 4 page 3NTC ThermistorsGeneral Characteristics2.1.5. Further approximation of R (T) curveThe description of the characteristic R (T) can be improvedby using a greater number of experimental points, and byusing the equation:1 = A + B ( n R) + C ( n R)3TThe parameters A, B and C are determined by solving theset of equations obtained by using the measured resis-tances at three temperatures.The solution of the above equation gives the resistance atany temperature:The precision of this description is typically 0.2°C for therange –50 to +150°C (A, B, C being determined with exper-imental values at –20, +50 and 120°C) or even better if thistemperature range is reduced. The ratios R(T)/R(25°C) foreach of the different materials shown on pages 29 to 33have been calculated using the above method.2.1.6. Resistance tolerance and temperatureprecisionAn important characteristic of a thermistor is the toleranceon the resistance value at a given temperature.This uncertainty on the resistance (DR/R) may be related tothe corresponding uncertainty on the temperature (DT),using the relationship:T = 100 •R•1RExample: consider the thermistor ND06M00152J —• R (25°C) = 1500 ohms• Made from M material• R (T) characteristic shown on page 23 gives:= - 4.4%/°C at 25°C• ToleranceR/R = ±5% is equivalent to:T = 5%/4.4%/°C = ±1.14°C2.1.7. Resistance tolerance at any temperatureAny material used for NTC manufacturing always displays adispersion for the R (T) characteristic.This dispersion depends on the type of material usedand has been especially reduced for our accuracy seriesthermistors.Thus, the tolerance on the resistance ( R2/R2) at a temper-ature T2 is the sum of two contributions as illustrated onFigure 1:– the toleranceR1/R1 at a temperature T1 used as areference.– an additional contribution due to the dispersion onthe characteristic R (T) which may be called“Manufacturing tolerance” (Tf).Figure 1Differentiating the equation R = A exp (B/T), the two contri-butions on the tolerance at T can also be written:R2=R1 +⎪⎪ • BR2R1The T(f) values given with the resistance – temperaturecharacteristics on pages 29 to 33 are based on a computersimulation using this equation and experimental values.2.1.8. Designing the resistance tolerancesUsing the fact that the coefficientdecreases with temper-ature (α = –B/T2), it is generally useful to define the closesttolerance of the thermistor at the maximum value of thetemperature range where an accuracy in °C is required.For example, let us compare the two designs 1 and 2hereafter:Only the Design 2 is able to meet the requirementΔT1°Cfrom 25°C to 100°C.RΩR2525°CTTemperature (°C)Graph with BGraph with B±ΔB}(ΔR)25°C}} (ΔR)25°C+TF} =(ΔR)T1 - 1T1T2TRαDesign 1Design 2(°C)(Ω)(%/°C)R/R(%)T(°C)R/R(%)T(°C)03275-5.23.50.75.01.0251000-4.43.00.74.51.155300-3.73.51.04.01.185109-3.14.11.33.41.110069.4-2.94.51.63.01.0A- 1/TC()A- 1/TC()n R (T) =][ -27213BC3+323272+ 43()- 3+272A- 1/TC()()()+323272+ 43A- 1/TC()BC()()

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