RESISTANCE - TEMPERATURE TABLES
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NTC (Negative Temperature Coefficient) is the negative percent resistance change per degree C. To determine the resistance tolerance of a precision thermistor at any temperature point, multiply the temperature tolerance time the NTC. As an example, a Curve A thermistor with a temperature tolerance of +1℃ over the temperature range 0℃ to 70℃ would have the following resistance tolerance: 0℃=+5.1%; 25℃=+4.4%; 70℃=+3.4% RT/R25 Ratio is the resistance at temperature divided |
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by the resistance at 25℃. To determine the resistance at other temperature points, multiply the coefficient by the R25 value. Ratio TOL(Tolerance) is the resistance tolerance at a temperature point due to slope variance from the nominal R-T Curve. This tolerance applies to thermistors point-matched to a single temperature point. The ratio tolerance is added to the percent resistance tolerance at the point-matched temperature. |
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CURVE A |
CURVE B |
CURVE C |
CURVE D |
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B 25/85 |
3975K |
3942K |
3695K |
4262K |
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Temp℃ |
Typical R25=1K to 100K RT/R25
RATIO RATIO
TOL NTC |
Typical R25=10K to
100K RT/R25
RATIO RATIO TOL NTC |
Typical R25=5K to 20K RT/R25
RATIO RATIO TOL NTC |
Typical R25=25K to
100K RT/R25
RATIO RATIO TOL NTC |
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-50 |
67.13 |
3.5 |
7.1 |
56.39 |
3.5 |
6.7 |
44.13 |
3.5 |
6.3 |
82.36 |
3.5 |
7.4 |
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-45 |
47.26 |
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6.9 |
40.56 |
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6.5 |
32.36 |
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6.1 |
57.30 |
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7.1 |
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-40 |
33.69 |
3.0 |
6.7 |
29.48 |
3.0 |
6.3 |
23.97 |
3.0 |
5.9 |
40.34 |
3.0 |
6.9 |
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-35 |
24.29 |
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6.4 |
21.64 |
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6.1 |
17.92 |
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5.3 |
28.72 |
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6.7 |
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-30 |
17.71 |
2.4 |
6.2 |
16.03 |
2.4 |
5.9 |
13.52 |
2.4 |
5.6 |
20.67 |
2.4 |
6.5 |
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-25 |
13.05 |
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6.0 |
11.99 |
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5.7 |
10.29 |
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5.4 |
15.02 |
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6.3 |
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-20 |
9.711 |
1.9 |
5.8 |
9.040 |
1.9 |
5.6 |
7.891 |
1.9 |
5.2 |
11.03 |
1.9 |
6.1 |
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-15 |
7.297 |
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5.6 |
6.875 |
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5.4 |
6.102 |
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5.1 |
8.174 |
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5.9 |
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-10 |
5.534 |
1.4 |
5.4 |
5.270 |
1.4 |
5.2 |
4.754 |
1.4 |
4.9 |
6.113 |
1.4 |
5.7 |
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-5 |
4.234 |
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5.3 |
4.071 |
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5.1 |
3.731 |
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4.8 |
4.611 |
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5.6 |
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0 |
3.266 |
1.0 |
5.1 |
3.168 |
1.0 |
4.9 |
2.949 |
1.0 |
4.6 |
3.507 |
1.0 |
5.4 |
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5 |
2.540 |
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5.0 |
2.483 |
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4.8 |
2.346 |
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4.5 |
2.689 |
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5.2 |
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10 |
1.991 |
0.5 |
4.8 |
1.959 |
0.5 |
4.7 |
1.879 |
0.5 |
4.4 |
2.077 |
0.5 |
5.1 |
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15 |
1.572 |
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4.7 |
1.556 |
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4.5 |
1.514 |
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4.3 |
1.617 |
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4.9 |
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20 |
1.249 |
0.1 |
4.5 |
1.244 |
0.1 |
4.4 |
1.227 |
0.1 |
4.1 |
1.267 |
0.1 |
4.8 |
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25 |
1.000 |
0.0 |
4.4 |
1.000 |
0.0 |
4.3 |
1.000 |
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