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Glossary of NTC Thermistor
1.Rt --- Zero Power Resistance Value
The resistance value measured at a fixed temperature by adopting sufficiently low power consumption.
2. R25 --- Rated Zero-power Resistance Value
The resistance value measured at
3. B Value
B value is a constant, determined by the ceramic material and represents the slope of the R/T curve,expressed in the following equation
In this formula: | RT1 is the Zero-power resistance at temperature T1; |
| RT2 is the Zero-power resistance at temperature T2. |
| Unless otherwise specified, B value is determined from measurements made at |
4. Zero-power Resistance-to-Temperature Coefficient
The temperature coefficient of resistance is defined as the relative change in resistance referred to the change in temperature.
In the formula: | аT-zero power resistance-temperature coefficient at temperature T |
| RT- zero power resistance at temperature T |
| T-temperature (expressed in K) |
| B-B Value |
5. Dissipation factor δ
The dissipation factor δ is defined as the ratio of the change in power dissipation and the resultant change in the thermistor’s body temperature.δ=ΔP/ΔT. δ changes in response when the ambient temperature changes, within the operating temperature range.
6. Thermal Time Constant τ
Thermal Time Constant is the time required by a thermistor to change 63% of the difference between its initial and final temperature. τ= C/δ
7、Maximum Stable Current
Maximum successive current can be applied in NTC thermistor in the ambient temperature of
8、Resistance-Temperature Characteristics
The dependence of the zero power resistance on its body temperature.