91930 Datasheet, PDF (2/6 Pages) EPCOS – NTC thermistors for inrush current limiting

Inrush current limiters
ICLs
B57237
S237
Applications
Switch-mode power supplies
Soft-start motors, e.g. in vacuum cleaners
Dimensional drawing
Features
Useable in series connections up to 265 V_rms
Coated thermistor disk
Kinked leads of tinned copper wire
Wide resistance range
UL approval (E69802)
Options
Resistance tolerance <20% and alternative
lead configurations available on request
Delivery mode
Bulk (standard),
cardboard tape, reeled or in Ammo pack
General technical data
Dimensions in mm
Approx. weight 2 g
Climatic category
Max. power
Resistance tolerance
Rated temperature
B value tolerance
Dissipation factor
Thermal cooling time constant
Heat capacity
(IEC 60068-1)
(at 25 °C)
(in air)
(in air)
P_max
∆R_R/R_R
T_R
∆B/B
δ_th
τ_c
C_th
55/170/21
3.1
±20
25
±3
approx. 17
approx. 90
approx. 1530
W
%
°C
%
mW/K
s
mJ/K
Electrical specification and ordering codes
R₂₅ I_max
No. of
B_25/100
(0...25 °C) R/T char-
ΩA
acteristic K
1 9.0
1201 2700
2.2 7.0
1202 2800
2.5 6.5
1202 2800
4.7 5.1
1203 2900
5 5.0
1203 2900
7 4.2
1302 3000
10 3.7
1308 3060
15 3.0
1302 3000
22 2.8
1304 3300
33 2.5
1304 3300
C 1)
test
230 V
µF
700
700
700
700
700
700
700
700
700
900
C 1)
test
110 V
µF
2800
2800
2800
2800
2800
2800
2800
2800
2800
3600
Param.
for R(I)¹⁾
k
0.622
0.806
0.843
1.03
1.05
1.16
1.29
1.49
1.57
1.78
Param.
for R(I)¹⁾
n
1.27
1.30
1.30
1.32
1.32
1.33
1.34
1.33
1.37
1.37
Ordering code
B57237S0109M000
B57237S0229M000
B57237S0259M000
B57237S0479M000
B57237S0509M000
B57237S0709M000
B57237S0100M000
B57237S0150M000
B57237S0220M000
B57237S0330M000
1) For details on the capacitance Ctest as well as on the parameters k and n refer to "Application Notes", chapters 2.6 and 2.7.
Please read Important notes and
Cautions and warnings at the end of this document.
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