NTC thermistors for
inrush current limiting
Leaded and coated disks
Series/Type: B57238S0***M0**
Date: May 2013
EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.Inrush current limiters B57238S0***M0**
ICLs S238
Applications Dimensional drawing
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 for line applications
Kinked leads of tinned copper wire
Wide resistance range
Manufacturer's logo, NTC and resistance value
stamped on
UL approval (E69802)
Dimensions in mm
Approx. weight 3 g
Options
Resistance tolerance <20% and alternative lead
configurations available on request
Delivery mode
Bulk (standard) or with cardboard tape on 500-mm reel
General technical data
Climatic category (IEC 60068-1) 55/170/21
Max. power (at 25 C) P 3.9 W
max
Resistance tolerance R /R 20 %
R R
Rated temperature T 25 C
R
Dissipation factor (in air) approx. 20 mW/K
th
Thermal cooling time constant (in air) approx. 80 s
c
Heat capacity C approx. 1600 mJ/K
th
Electrical specification and ordering codes
1) 1)
R
R I C C min Ordering code
25 max test test
(@ I , 25 C)
(0...65 C) 230 V AC 110 V AC max
A F F
2.5 8.4 700 2800 0.054 B57238S0259M0**
3 7.4 700 2800 0.068 B57238S0309M0**
4.7 6.6 700 2800 0.090 B57238S0479M0**
5 6.4 700 2800 0.097 B57238S0509M0**
7 6.0 700 2800 0.113 B57238S0709M0**
8 5.5 700 2800 0.131 B57238S0809M0**
** = Delivery mode
00 = Bulk
51 = Reel packing
1) For details on the capacitance C please refer toApplication note, chapter 1.6.
test
Please read Cautions and warnings and Page 2 of 20
Important notes at the end of this document.