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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
