# NTC Thermistors NTC __C_ vs Temperature Curves by dfgh4bnmu

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```									NTC (%/°C) vs Temperature Curves
Vishay Dale

NTC Thermistors

NTC (- %/°C) is negative temperature coefficient of                                   RT-R25 Ratio is resistance at temperature T divided by
resistance at temperature (T) expressed in % resistance                               resistance at + 25 °C. To determine the resistance of a NTC
change per °C. Since one NTC resistance change is                                     thermistor at temperatures other than + 25 °C, multiply the
approximately equivalent to + 1 °C temperature change,                                ratio selected from the appropriate curve column above by
NTC is useful in developing curve tracking thermistor
resistance at + 25 °C (e.g., Curve 1, 10 kΩ at + 25 °C,
specifications (e.g., Curve 1, 10 000 Ω ± 4.4 % at + 25 °C;
32 660 Ω ± 5.1 % at 0 °C; 1753 Ω ± 3.4 % at + 70 °C results                           1257 Ω at + 80 °C).
in a ± 1 °C: curve tracking thermistor 0° to 70 °C, 0.5 NTC =                         NOTE: For + 1 °C Ratio Tables, see pages 11 to 16.
± 0.5 °C, etc.).
MAXIMUM TEMPERATURE for thermistors listed is
MT ± % is manufacturing tolerance at temperature. Add to
+ 150 °C; however, continuous operation or cycling above
resistance tolerance specified at + 25 °C, (e.g., Curve 1,
10 kΩ ± 10 % at + 25 °C, 1257 Ω ± 12.1 % at + 80 °C). Not                             + 125 °C (curve tracking above the specified temperature
applicable to curve tracking thermistors.                                             range) may cause thermistors to exceed the originally
specified tolerances.

CURVES

7                                                                                   7
NTC ( - %/°C)
NTC ( - %/°C)

5                                                                                   5

Curve 13
3                                              Curve 1                              3                                           Curve 12
Curve 2                                                                          Curve 7
- 50       0        50      100     150                                             - 50    0        50      100      150

7
7
NTC ( - %/°C)
NTC ( - %/° C)

5
5

3                                           Curve 17
3                                              Curve 4                                                                          Curve 3
Curve 8                                                                          Curve 14
Curve 9                                  - 50    0       50       100      150
- 50      0         50     100       150

NTC                                                    BETA
CURVE NUMBER
at + 25 °C (%/°C)                                        + 25 °C/+ 75 °C
1                                        - 4.40                                                  3964
2                                        - 3.83                                                  3477
3                                        - 3.70                                                  3181
4                                        - 4.68                                                  4247
7                                        - 4.83                                                  4437
8                                        - 4.30                                                  3925
9                                        - 4.03                                                  3679
12                                        - 5.23                                                  4842
13                                        - 6.22                                                  5718
14                                        - 3.10                                                  3022
17                                        - 4.54                                                  4064

www.vishay.com                                      For technical questions, contact: thermistor1@vishay.com                        Document Number: 33002
8                                                                                                                                        Revision: 30-Oct-06

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