NCP21XM472J03RA Murata, NCP21XM472J03RA Datasheet - Page 8

• Manufacturer Part Number: NCP21XM472J03RA
• Description: Thermistors - NTC 4.7K OHM 5%
• Manufacturer: Murata
• Series: NCPr
• Type: NTCr

Specifications of NCP21XM472J03RA

• Resistance: 4.7 KOhms
• Tolerance: 5 %
• Termination Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 125 C
• Current Rating: 0.65 mA
• Dimensions: 1.25 mm W x 2 mm L
• Power Rating: 200 mW
• Package / Case: 0805
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

!Note
• This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our
• This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
sales representatives or product engineers before ordering.
!Note
!Basic Characteristics
1. Zero-power Resistance of Thermistor: R
2. B-Constant
3. Thermal Dissipation Constant
4. Thermal Time Constant
!Performance
Please inquire about test conditions and ratings.
6
Resistance
B-Constant
Thermal Dissipation
Constant
Rated Electric Power
Permissive Operating Current
R=R
R: Resistance in ambient temperature T (K)
(K: absolute temperature)
R
B: B-Constant of Thermistor
as (1) formula
B=Rn (R/R
When electric power P (mW) is spent in ambient
temperature T
there is a formula as follows
P=C (T
C: Thermal dissipation constant (mW/ C)
Thermal dissipation constant is varied with dimensions,
measurement conditions, etc.
Period in which Thermistor's temperature will change
63.2% of its temperature difference from ambient
temperature T
0
• 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 because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
: Resistance in ambient temperature T
0
expB (1/T-1/T
2
-T
Item
1
) ..................(3)
0
) / (1/T-1/T
1
0
and thermistor temperature rises T
( C) to T
0
) ..............(1)
0
)
1
( C).
Measured by zero-power in specified ambient temperature.
Calculated between two specified ambient temperatures by next formula.
T and T
Shows necessary electric power that Thermistor's temperature rises 1˚C by self heating.
It is calculated by next formula (mW/˚C).
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.
It is possible to keep Thermistor's temperature rising max. 1˚C.
............(2)
B =
C =
0
Rn (R/R
1/TY1/T
is absolute temperature (K).
TYT
P
0
0
0
0
)
(K)
2
,
Resistance vs. Temperature
Thermal Time Constant
Condition
T
T
1
0
10
10
10
10
1
2
1
1
2
20
X
0
20
Temperature (˚C)
Basic Characteristics
Time
40
60
63.2%
80
100
120
B=3450
B=3900
B=4100
R44E.pdf
11.2.21