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B57238 Datasheet Preview

B57238 Datasheet

Inrush current limiters

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B57238 pdf
NTC thermistors for
inrush current limiting
Leaded and coated disks
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Series/Type:
Date:
B57238
March 2006
© EPCOS AG 2006. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.



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EPCOS

B57238 Datasheet Preview

B57238 Datasheet

Inrush current limiters

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B57238 pdf
Inrush current limiters
ICLs
B57238
S238
Applications
Switch-mode power supplies
Soft-start motors, e.g. in vacuum cleaners
Dimensional drawing
Features
Useable in series connections up to 265 Vrms
Coated thermistor disk for line applications
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 3 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)
Pmax
RR/RR
TR
B/B
δth
τc
Cth
55/170/21
3.9
±20
25
±3
approx. 20
approx. 80
approx. 1600
W
%
°C
%
mW/K
s
mJ/K
Electrical specification and ordering codes
R25 Imax
No. of
B25/100
(0...65 °C) R/T char-
A
acteristic K
2.5 8.4
1202 2800
3 7.4
1203 2900
4.7 6.6
1207 2965
5 6.4
1207 2965
7 6.0
1207 2965
8 5.5
1208 3065
10 5.0
1208 3065
15 4.4
1209 3165
16 4.0
1209 3165
C 1)
test
230 V
µF
700
700
700
700
700
700
700
700
700
C 1)
test
110 V
µF
2800
2800
2800
2800
2800
2800
2800
2800
2800
Param.
for R(I)1)
k
0.984
1.04
1.20
1.23
1.34
1.40
1.50
1.67
1.69
Param.
for R(I)1)
n
1.36
1.36
1.37
1.37
1.38
1.39
1.39
1.40
1.39
Ordering code
B57238S0259M000
B57238S0309M000
B57238S0479M000
B57238S0509M000
B57238S0709M000
B57238S0809M000
B57238S0100M000
B57238S0150M000
B57238S0160M000
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.
Page 2 of 6


Part Number B57238
Description Inrush current limiters
Maker EPCOS
Total Page 6 Pages
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