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
                                 TEMP. DEG. CENTIGRADE                                                            TEMP. DEG. CENTIGRADE




                                                                                                       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
                                                                                                                  TEMP. DEG. CENTIGRADE
                                TEMP. DEG. CENTIGRADE


                                                                             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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