NTSA0XR502EE1B0 Datasheet, PDF (8/47 Pages) Murata Manufacturing Co., Ltd. – NTC Thermistors for Temp. Sensor and Compensation Chip Type

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Feb.21,2011
Basic Characteristics
!Basic Characteristics
1. Zero-power Resistance of Thermistor: R
R=R0 expB (1/T-1/T0) ..............(1)
R: Resistance in ambient temperature T (K)
(K: absolute temperature)
R0: Resistance in ambient temperature T0 (K)
B: B-Constant of Thermistor
2. B-Constant
as (1) formula
B=Rn (R/R0) / (1/T-1/T0)
............(2)
Resistance vs. Temperature
10²
10¹
1
3. Thermal Dissipation Constant
When electric power P (mW) is spent in ambient
temperature T1 and thermistor temperature rises T2,
there is a formula as follows
P=C (T2-T1) ..................(3)
C: Thermal dissipation constant (mW/°C)
Thermal dissipation constant is varied with dimensions,
measurement conditions, etc.
10^−1
B=3450
B=3900
B=4100
10^−2
−20 0
20 40 60 80 100 120
Temperature (˚C)
4. Thermal Time Constant
Period in which Thermistor's temperature will change
63.2% of its temperature difference from ambient
temperature T0 (°C) to T1 (°C).
Thermal Time Constant
T1
X
63.2%
T0
Time
!Performance
Item
Resistance
B-Constant
Thermal Dissipation
Constant
Condition
Measured by zero-power in specified ambient temperature.
Calculated between two specified ambient temperatures by next formula.
T and T0 is absolute temperature (K).
B
=
Rn (R/R0)
1/TY1/T0
Shows necessary electric power that Thermistor's temperature rises 1˚C by self heating.
It is calculated by next formula (mW/˚C).
C=
P
TYT0
Rated Electric Power
Shows the required electric power that causes Thermistor's temperature to rise to a specified temperature by self heating,
at ambient temperature of 25 °C.
Permissive Operating Current
It is possible to keep Thermistor's temperature rising max. 1˚C.
Please inquire about test conditions and ratings.
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