NTC热敏电阻的基本特性.pdf

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1、S S T Qingdao Sanyuan Sensor Technology Co.Xtd SST NTC THERMISTOR TEMPERA TURE SENSOR Contents NTC Basic properties of NTC Thermistor STTSTT thermistor type Part number system STT NTCSTT NTC Thermistor BEC BEC Series REB REB Series REP REP Series RET RET Series REF REF Series REU REU Series RGF-2515

2、 RGF-2515 Series AGD AGD Series Resistance-Temperature Table Thermistor Temperature Sensor Sensors for room air conditioner Sensors for refrigerator Sensors for car air conditioner Sensor for gas boiler STTNTCBSTTNTC11 RR 0 exp B*(l/T-1/T 0R:T(KR 0 T0(KB:BT（K=t（C+273.15 B11B22 B T CT 2+DT+EC,D,E BB1

3、33B=（lnRl-lnR2/（l/Tl-l/T2.R1 T1（KR 2 T 2（KB2000-6000KBFB1SB UrSC-UArfl t.V MMMi IB(IEXt.4Ma I 3 8 3.8 4.0 (2)-(1)2400K(23276K(3J3500K-(4)3950K(54550K (3)/2.6 2.8 3 0 UTVUAO IX M IBCIKXMlM.l 0MJD*3.6 3.8 4.0 100 c)50 25 0-20 2.6 28 i i i 30 32 34 1 STT negative temperature coefficient(NTC thermistors

4、 are fine ceramic semiconductors manufactured from high purity and uniform materials to achieve a constnjction of near theoretical density This ensures small size,tight resistance and B value tolerance,and fast response to temperature variations,making for a highly sensitive and precision component.

5、STT thermistors are available in a wide range of types to meet custom demands for high precision,compactness and high reliability Basic properties of NTC Thermistor Resistance-temperature characteristics The resistance and temperature characteristics of a thermistor can be approximated by equation 1

6、 (eq.l R=R 0 exp B(l/T-1/T 0 R:resistance at absolute temperature T(K R 0:resistance at absolute temperature T 0(K B:B constant T(K=t(C+273.15 Actually,the B value for the thermistor is constant depending on its material composition,but equation 1 may yield different results from actual values if ap

7、plied over a wide temperature range.By taking the B constant in equation 1 and calculating it as a function of temperature,as shown in equation 2,the difference with actual value can be minimized.(eq.2 B T=CT 2+DT+E,where C,D,and E are constants B constant B constant is defined as the ratio of the r

8、esistance changes against temperature changes between two optional temperatures and is formulated by the equation 3 as below.(eq.3 B=(InR 1-InR 2/(1/T 1-1/T2 where R 1:resistance value at the absolute temperature T 1(K R 2:resistance value at the absolute temperature T 2(K In general,B constant with

9、in the range of 2000 6000K is used The rate of resistance change by temperature becomes large in propotion to an increase of B constant.The resistance-temperature characteristics for different B values are shown in figure 1.(Fig.l Resistance temperature characteristics a(a1 C(K(aB144 a=1/R*dRdT x 10

10、0=-B/T2 x 100(%/C a,61 C T1,T2,P，55 6=P/(T1-T2(mW/C.P=I2R=IxVo 25C 25C66x(-25tC7O7t xN63.2%T1T2tT88T=(T1-T2 exp(-t/r+T2=(T2-T1 1-exp(-t/x +T1 Resistance temperatiu-e coefficient,a Tlie resistance temperature coefficient(a is defined as the rate of change of the resistance associated with a tempertur

11、e variation of 1 C at any given temperature.The relationsliip between the resistance temperature coefficient(a and the B constant can be obtained by differentiating equation 1 described previously.(eq.4 a=1/R*dR/dT x 100=-B/T2x 100(%/C A negative value signifies that the rated zero power resistance

12、decreases with increasing temperatures.Heat dissipation constant,6 Tlie dissipation constant(6 is necessaiy power for increasing the temperature of the thermistor element by 1 C in state of thermal equilibrium by self heating.The self heating process is subject to the following relationship between

13、the thermistor temperature Tl,ambient temperature T2,and consumed power P(eq.5 d=P/(Tl-T2(mW/C,where P=I2R=I x V The dissipation constants in this catalog were measured in still air at 25 C and in their final form before shipment.The dissipation constant will vaiy according to the shape and dimensio

14、n of thermistor and its mounting and environmental condition Power rating The power rating is the maximum power for a continuous load at the rated temperature In this catalog,the value is calculated from the following equation 6 using a rated temperature of 25 C (eq.6 Rated power=heat dissipation co

15、nstant x(maximum allowable working temperature 25 Maximum opeiating power The maximum operating power is the power level for the maximum permissible temperature rise through self heating when using a thermistor for temperature compensation or as a temperature sensor.The maximum operating power,when

16、t is the permissible temperature rise,can be calculated using equation 7(eq.7 Maximum operating power=t x heat dissipation constant Theniial time constant,T The thermal time constant is defined as the time for the temperature a thermistor,with no load applied,changes to 63.2%of the difference betwee

17、n its initial and final temperatures,during a sudden change in the surrounding temperature When the surrounding temperature of the thermistor changes from T1 to T2,the relation between the elapsed time t and the thermistor temperature T can then be expressed by equation 8.(eq.8 T=(T1-T2 exp(-t/T+T2=

18、(T2-T1 1-exp(-1/T +T1 Tt=T,JjllJ(T-T1/(T2-T1=0.63263.2%t121 50C25C34.2CSTT QISt.DAft S4TIA IK lOIXXa 2vs BCEchipAg Ag-Pd-40C-100C lk Q-200k Q AGD Axial glass Ni&Pb/Sn CP wire-40C-300C lk Q-l MQ REB Radial epoxy Pb/Sn Cu-Ni 40C-110C lk Q-200k Q.REP Radial epoxy PVC Cu wire-40C-100C lk Q-200k Q RET Ra

19、dial epoxy Ni,Ni-Fe -40C-110C lk d-200k Q REF Radial epoxy Ni Fe-Ni-40C-110C lkQ-1 MQ REU Radial epoxy Ni-Fe-40C-l 10C lk Q-l MQ RGF Radial glass NiFe-Ni-40 C-300 C lkQ-1 MQ Tlie constant iis called the themial time constant.If t=T,(T-T 1/(T2-T 1=0.632.In other words,the thermal time constant is the

20、 elapsed time it takes for the temperature of the thermistor changes by 63.2%of its initial temperature.The relationship between the changes of the thermistor temperature versus the elapsed time is shown in table 1 and figure 2.(Table 1 Thermal time constant table(Fig.2 Thermal time constant(time vs

21、.temperature Measuring conditions for thermal time constant in this catalog are as follows:A lermistor in its final form before shipment is moved from 50C to 25 C in a still air environment,and the time is measured until the temperature of the thermistor reaches 32.4C Please note,the thermal time co

22、nstant will vary according to size,environmental and packaging conditions STT thermistor type Series Type Termination Operating temp range Resistance range BCE Rectangular chip Ag Ag-Pd-40C100 C lk Q-200k GAGD Axial leaded glass Ni&solder plated CP wire-40C-300C lk Q-l MQ REB Radial leaded epoxy Sol

23、der plated Cu-Ni alloy-40C 110cClk Q200k QREP Radial leaded epoxy PVC coated Cu wire-40C-100C lk Q-200k GRET Radial leaded epoxy Teflon coated Ni,Ni-Fe alloy-40C-l 10C lk 2-200k QREF Radial leaded epoxy Ni plated Fe-Ni alloy-40C110Clk d-l MQ REU Radial leaded epoxy Polyurethane coated Ni-Fe alloy-40

24、C-l 10Clk Q1 MQ RGF Radial leaded glass Ni plated Fe-Ni alloy-40 C-300 C lkQ-1 MQ T(T-T 1/(T 2-T 1 T 2T 3T 4T 5T 6T 7T 63.2%86.5%95.0%98.2%99.4%99.8%99.9%t(T-T 1/(T 2-T 1 T 2T 3T 4T 5T 6T 7T 63.2%86.5%95.0%98.2%99.4%99.8%99.9%STRGF103H3JGE3015 Q 0500 50Q 101 100Q 202 2000Q（2kH 303 30000Q（30k2 404 40

25、0000Q（400m F1 G+2 H3 J 5 K+10 BBB（K3 3000 4 4000 B（KB（KA 1-50 B 51-100 C 101-150 D 151-200 E 201-250 F 251-300 G 301-350 H 351-400 I 401-450 J 451-500 K 501-550 L 551-600 M 601-650 N 651-700 O 701-750 P 751-800 Q 801-850 R 851-900 S 901-950 T 951-000 B（K 3J 3451-3500 4B 4051-4100 BF1 G2 H3 X-20C Y-1

26、0C Z-3C AOC B5C C 10C D20C E25C F 37.5 C G 50C H 75C I 80C J85C K 100C L 110C M 150C N200C O250C P 300C Q 350C R 400C （LxW LxW 1510 1.5xl.0nim 3015 3.0 x1.5mm 4035 4.0 x3.5mm Part number system STRGF1O3H3JGE3O15 Series name Nominal resistance Tlie resistance is expressed in tliiee digit codes and in

27、 units of G Tlie first and second digits are effective numbers and the third digit is number of 0 following the effective number.Code Resistance 500 50Q 101 100Q 202 20000(218 303 30000Q(30kn 404 400000Q(400kn Nominal resistance tolerance Code Tolerance(%F1 G2 H+3 J 5 K+10(4)B constant This code ind

28、icates the value of B constant using a combination of one numeric and one alphabetic character.1st code B constant(K 3 3000 4 4000 2nd code B constant(K 2nd code B constant(K A 0-50 B 51-100 C 101-150 D 151-200 E201-250 F251-300 G 301-350 H 351-400 I 401-450 J 451-500 K 501-550 L 551-600 M 601-650 N

29、 651-700 O 701-750 P 751-800 Q 801-850 R 851-900 S 901-950 T 951-000 Example Code B constant(K 3J 3451-3500 4B 4051-4100 B constant tolerance Code Tolerance(%F+l G+2 H3 Ambient temperature of nominal resistance(sorting temp.Code Temp.Code Temp.Code Temp.X-20C Y-10C Z-3C A0C B5C C 10C D20C E25C F37.5

30、C G50C H75C I80C J85C K 100C L 110C M 150C N200C O250C P 300C Q 35OC R 400C Dimensions(L x W Code Lx W 1510 1.5xl.0mm 3015 3.0 xl.5mm 4035 4.0 x3.5mm BEC S(JIV.DAO MNSrtR IK IIMHBf F.QIM.DAO 1 1%,2%,3%，5%B1%,2%:-40C-+110C BEC Series Featiues Small precision type Possible for small and low cost senso

31、r assembly Applications Temperatiu-e sensor for refiigerator and aii-con Temperature compensation for IR sensor Resistance tolerance:1%,2%,3%,5%B constant tolerance:1%,2%Operating temp range:-40C-+110C（Characteristics Type R25B 25/50 B 25/85 6 Heat dissipation constant TThermal time constant S Power

32、 rating BEC 102*3J*E lk2 3480K 3514K 0.6mW/C 8sec 5mW BEC 102*3J*E lkn 3499K 3540K 0.6mW/C 8sec 5mW BEC 202*3K*E 2kQ 3511K 3553K 0.6mW/C 8sec 5mW BEC 202*3L*E 2kQ 3585K 3627K 0.6mW/C 8sec 5mW BEC 202*3S*E 2kH 3939K 3948K 0.6mW/C 8sec 5mW BEC 302*3I*E 31d2 3447K 3488K 0.6mW/C 8sec 5mW BEC 302*3S*E 3k

33、H 3939K 3948K 0.6mW/C 8sec 5mW BEC 502*3F*E 5kQ 3276K 3323K 0.6mW/C 8sec 5mW BEC 5O2*3J*E 3452K 3490K 0.6mW/C 8sec 5mW BEC 502*3N*E 5kH 3691K 3746K 0.6mW/C 8sec 5mW BEC 502*3S*E 5kH 3934K 3974K 0.6mW/C 8sec 5mW BEC 502*3S*E 3934K 3996K 0.6mW/C 8sec 5mW BEC 103*3H*E 10kH 3379K 3435K 0.6mW/C 8sec 5mW

34、BEC 1O3*3J*E 101d2 3452K 3490K 0.6mW/C 8sec 5mW BEC 103*3L*E 101d2 3582K 3627K 0.6mW/C 8sec 5mW BEC 103*3N*E lOkQ 3691K 3746K 0.6mW/C 8sec 5mW BEC 1O3*3S*E lOkn 3902K 3935K 0.6mW/C 8sec 5mW BEC 1O3*3S*E 10kn 3934K 3974K 0.6mW/C 8sec 5mW BEC 1O3*3S*E lOkQ 3949K 3990K 0.6mW/C 8sec 5mW BEC 153*4A*E 15k

35、Q 4019K 4070K 0.6mW/C 8sec 5mW BEC 203*3S*E 20kH 3949K 3990K 0.6mW/C 8sec 5mW BEC 203*4A*E 20kH 4043K 4087K 0.6mW/C 8sec 5mW BEC 233*4D*E 231d2 4177K 4240K 0.6mW/C 8sec 5mW BEC 303*3R*E 301d2 3884K 3942K 0.6mW/C 8sec 5mW BEC 303*4B*E 304093K 4138K 0.6mW/C 8sec 5mW BEC 503*3N*E 50kQ 3694K 3747K 0.6mW

36、/C 8sec 5mW BEC 5O3*3T*E 50k2 3952K 4026K 0.6mW/C 8sec 5mW BEC 503*3T*E 501d2 3996K 4061K 0.6mW/C 8sec 5mW BEC 503*4D*E 50kR l(ll!Vi6l/C Ql CllN(a/(*.Y CYw Resistance tolerance:1%,2%,3%,5%B constant tolerance:1%,2%Operating temp range:-40C +110C（Characteristics Type R25B 25/50 B 25/85 0 Heat dissipa

37、tion constant TThermal time constant Power rating REB 102*3J*E 3480K 3514K 0.7mW/C Msec 55mW REB 102*3J*E lkn 3499K 3540K 0.7mW/C Msec 55mW REB 202*3K*E 3511K 3553K 0.7mW/C 14sec 55mW REB 202*3L*E 2kH 3585K 3627K 0.7mW/C 14sec 55mW REB 202*3S*E 2kH 3939K 3948K 0.7mW/C 14sec 55mW REB 302*3I*E 3kQ 344

38、7K 3488K 0.7mW/C 14sec 55mW REB 302*3S*E 3kQ 3939K 3948K 0.7mW/C 14sec 55mW REB 502*3F*E 5kQ 3276K 3323K 0.7mW/C 14sec 55mW REB 502*3J*E 5kH 3452K 3490K 0.7mW/C Msec 55mW REB 502*3N*E 3691K 3746K 0.7mW/C 14sec 55mW REB 502*3S*E 5k2 3934K 3974K 0.7mW/C 14sec 55mW REB 502*3S*E 5kH 3934K 3996K 0.7mW/C

39、14sec 55mW REB 103*3H*E lOkQ 3379K 3435K 0.7mW/C 14sec 55mW REB 1O3*3J*E 10kH 3452K 3490K 0.7mW/C 14sec 55mW REB 1O3*3L*E lOkQ 3582K 3627K 0.7mW/C 14sec 55mW REB 1O3*3N*E 10m 369IK 3746K 0.7mW/C 14sec 55mW REB 1O3*3S*E lOldl 3902K 3935K 0.7mW/C 14sec55mW REB 1O3*3S*E 101d2 3934K 3974K 0.7mW/C 14sec

40、55mW REB 1O3*3S*E 101d2 3949K 3990K 0.7mW/C 14sec 55mW REB 153*4A*E 151d2 4019K 4070K 0.7mW/C 14sec 55mW REB 203*3S*E 20kn 3949K 3990K 0.7mW/C 14sec 55mW REB 203*4A*E 201d2 4043K 4087K 0.7mW/C 14sec 55mW REB 233*4D*E 23kQ 4177K 4240K 0.7mW/C 14sec 55mW REB 3O3*3R*E 3OkH 3884K 3942K 0.7mW/C 14sec 55m

41、W REB 303*4B*E 3OkH 4093K 4138K 0.7mW/C 14sec 55mW REB 503*3N*E 5OkQ 3694K 3747K 0.7mW./C 14sec 55mW REB 5O3*3T*E 5OkC Thermal time constant Power rating REP 102*3J*E lkQ 3480K 3514K 1.5mW/C 17sec 75mW REP 102*3J*E lld2 3499K 3540K 1.5mW/C 17sec 75mW REP 202*3K*E 3511K 3553K 1.5mW/C 17sec 75mW REP 2

42、02*3L*E 2kH 3585K 3627K 1.5mW/C 17sec 75mW REP 202*3S*E 2kH 3939K 3948K 1.5mW/C 17sec 75mW REP 302*3I*E 3kQ 3447K 3488K 1.5mW/C 17sec 75mW REP 302*3S*E 3kQ 3939K 3948K 1.5mW/C 17sec 75mW REP 502*3F*E 5kQ 3276K 3323K 1.5mW/C 17sec 75mW REP 502*3J*E 5kH 3452K 3490K 1.5mW/C 17sec 75mW REP 502*3N*E 51d2

43、 3691K 3746K 1.5mW/C 17sec 75mW REP 502*3S*E 51d2 3934K 3974K 1.5mW/C 17sec 75mW REP 502*3S*E 5kH 3934K 3996K 1.5mW/C 17sec 75mW REP 103*3H*E lOkQ 3379K 3435K 1.5mW/C 17sec 75mW REP 103*3J*E lOkH 3452K 3490K 1.5mW/C 17sec 75mW REP 103*3L*E 10kH 3582K 3627K 1.5mW/C 17sec 75mW REP 103*3N*E 10M2 3691K3

44、746K 1.5mW/C 17sec 75mWREP 103*3S*E 10M2 3902K 3935K 1.5mW/C 17sec 75mW REP 103*3S*E lOkQ 3934K 3974K 1.5mW/C 17sec 75mW REP 103*3S*E lOkQ 3949K 3990K 1.5mW/C 17sec 75mW REP 153*4A*E 15kH 4019K 4070K 1.5mW/C 17sec 75mW REP 203*3S*E 20kn 3949K 3990K 1.5mW/C 17sec 75mW REP 203*4A*E 20kQ 4043K 4087K 1.

45、5mW/C 17sec 75mW REP 233*4D*E 23kQ 4177K 4240K 1.5mW/C 17sec 75mW REP 303*3R*E 30kQ 3884K 3942K 1.5mW/C 17sec 75mW REP 303*4B*E 30kQ 4093K 4138K 1.5mW/C 17sec 75mW REP 503*3N*E 50kH 3694K 3747K 1.5mW/C 17sec 75mW REP 5O3*3T*E 50kQ 3952K 4026K 1.5mW/C 17sec 75mW REP 503*3T*E 50k2 3996K 4061K 1.5mW/C

46、17sec 75mWREP 503*4D*E 50kQ 4153K 4212K 1.5mW/C 17sec 75mW REP 104*4F*E lOOkQ 4254K 4314K 1.5mW/C 17sec 75mW REP 104*4I*E lOOkQ 4427K 4509K 1.5mW/C 17sec 75mW REP 204*4K*E 20OkQ 4546K 4629K 1.5mW/C 17sec 75mW REP 504*4K*E 500kQ 4546K 4629K 1.5mW/C 17sec 75mW RET:1%,2%:-40 C-+125 C RET Series Feature

47、s 6.8f O I V.D A I)M N S r t B I K l l 5 l i n C ：1%,2%,3%，5%B Small precision type Excellent themial cycle endurance Excellent heat resistance Applications Temperatiwe sensor for refiigerator and air-coil Temperature sensor for automobile Resistance tolerance:1%,2%,3%，5%B constant tolerance:1%,2%Op

48、erating temp range:-40C-+125C（Characteristics Type R25B 25/50 B 25/85 8 Heat dissipation constant TThermal time constant Power rating RET 102*3J*E lkQ 3480K 3514K 1.0mW/C lOsec 70mW RET 102*3J*E lld2 3499K 3540K 1.0mW/C lOsec 70mW RET 202*3K*E 21d2 3511K 3553K 1.0mW/C lOsec 70mW RET 202*3L*E 2kn 358

49、5K 3627K 1.0mW/C lOsec 70mW RET 202*3S*E 2kH 3939K 3948K 1.0mW/C lOsec 70mW RET 302*3I*E 3kQ 3447K 3488K 1.OmW/C lOsec 70mW RET 302*3S*E 3kH 3939K 3948K 1.0mW/C lOsec 70mW RET 502*3F*E 5kH 3276K 3323K 1.0mW/C lOsec 70mW RET 502*3J*E 5kH 3452K 3490K 1.OmW/C lOsec 70mW RET 502*3N*E 51d2 3691K 3746K 1.

50、0mW/C lOsec 70mW RET 502*3S*E 5k2 3934K 3974K 1.0mW/C lOsec 70mW RET 502*3S*E 5kH 3934K 3996K 1.0mW/C lOsec 70mW RET 103*3H*E lOkQ 3379K 3435K 1.OmW/C lOsec 70mW RET 1O3*3J*E 10kH 3452K 3490K 1.0mW/C lOsec 70mW RET 103*3L*E lOkQ 3582K 3627K 1.0mW/C lOsec 70mW RET 1O3*3N*E lOkQ 3691K 3746K 1.0inW/C l