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NCP21WB333J03RA Datasheet(PDF) 8 Page - Murata Manufacturing Co., Ltd.

Part # NCP21WB333J03RA
Description  NTC Thermistors
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Manufacturer  MURATA [Murata Manufacturing Co., Ltd.]
Direct Link  http://www.murata.com
Logo MURATA - Murata Manufacturing Co., Ltd.

NCP21WB333J03RA Datasheet(HTML) 8 Page - Murata Manufacturing Co., Ltd.

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R44E.pdf
Dec.17,2012
!Note • Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
6
1. Zero-power Resistance of Thermistor: R
2. B-Constant
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
as (1) formula
B=
Rn (R/R0) / (1/T-1/T0) ............(2)
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.
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).
Resistance vs. Temperature
!Basic Characteristics
!Performance
Thermal Time Constant
Item
Resistance
Condition
Measured by zero-power in specified ambient temperature.
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.
Thermal Dissipation
Constant
Shows necessary electric power that Thermistor's temperature rises 1°C by self heating.
It is calculated by next formula (mW/°C).
B-Constant
Calculated between two specified ambient temperatures by next formula.
T and T0 is absolute temperature (K).
Rn (R/R0)
B =
1/T
Y1/T0
P
C =
T
YT0
102
101
–20
Temperature (°C)
0
20406080
120
100
10–2
10–1
1
B=3450
B=3900
B=4100
Basic Characteristics
T1
T0
Time
63.2%
X
Please inquire about test conditions and ratings.


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