PRF18AS471QS2RB Murata, PRF18AS471QS2RB Datasheet - Page 7

• Manufacturer Part Number: PRF18AS471QS2RB
• Manufacturer: Murata

Specifications of PRF18AS471QS2RB

• Lead Free Status / RoHS Status: 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
5. Rated Electric Power
6. Permissive Operating Current
6
Basic Characteristics of NTC Thermistor
Measured by zero-power in specified ambient
temperatures.
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 Termistor's temperature will change
63.2% of its temperature difference from ambient
temperature T
Shows necessary electric power that Thermistor's
temperature rises 100˚C by self heating in ambient
temperature 25˚C.
It is possible to keep Thermistor's temperature rising max.
1˚C.
0
: Resistance in ambient temperature T
• 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.
0
expB (1/T-1/T
2
-T
1
) ..................(3)
0
) / (1/T-1/T
1
0
and thermistor temperature rises T
( C) to T
0
) ..............(1)
0
)
1
( C).
............(2)
0
(K)
2
,
Resistance vs. Temperature
Thermal Time Constant
T
T
1
0
10
10
10
10
1
2
1
1
2
20
X
0
20
Temperature (˚C)
Time
40
60
63.2%
80
100
120
B=3450
B=3900
B=4100
R03E.pdf
07.3.21