Datasheet

1) For details on the capacitance C
test
as well as on the parameters k and n refer to "Application Notes", chapters 2.6 and 2.7.
Applications
Switch-mode power supplies
Soft-start motors, e.g. in vacuum cleaners
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
Dimensional drawing
Dimensions in mm
Approx. weight 2 g
General technical data
Climatic category (IEC 60068-1) 55/170/21
Max. power (at 25 °C) P
max
3.1 W
Resistance tolerance ∆R
R
/R
R
±20 %
Rated temperature T
R
25 °C
B value tolerance ∆B/B ±3 %
Dissipation factor (in air) δ
th
approx. 17 mW/K
Thermal cooling time constant (in air) τ
c
approx. 90 s
Heat capacity C
th
approx. 1530 mJ/K
Electrical specification and ordering codes
R
25
Ω
I
max
(0...25 °C)
A
No. of
R/T char-
acteristic
B
25/100
K
C
test
1)
230 V
µF
C
test
1)
110 V
µF
Param.
for R(I)
1)
k
Param.
for R(I)
1)
n
Ordering code
1
9.0 1201 2700 700 2800 0.622 1.27 B57237S0109M000
2.2 7.0 1202 2800 700 2800 0.806 1.30 B57237S0229M000
2.5 6.5 1202 2800 700 2800 0.843 1.30 B57237S0259M000
4.7 5.1 1203 2900 700 2800 1.03 1.32 B57237S0479M000
5
5.0 1203 2900 700 2800 1.05 1.32 B57237S0509M000
7
4.2 1302 3000 700 2800 1.16 1.33 B57237S0709M000
10
3.7 1308 3060 700 2800 1.29 1.34 B57237S0100M000
15
3.0 1302 3000 700 2800 1.49 1.33 B57237S0150M000
22
2.8 1304 3300 700 2800 1.57 1.37 B57237S0220M000
33
2.5 1304 3300 900 3600 1.78 1.37 B57237S0330M000
Inrush current limiters B57237
ICLs S237
Page 2 of 6Please read Important notes and
Cautions and warnings at the end of this document.