NTC thermistors for
inrush current limiting
Leaded and coated disks
Series/Type: B57238S0***M0**
Date: November 2015
© 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.
Applications
Inrush current limiting, e.g. in switch-mode power
supplies, soft-start motors
Features
Leaded and coated NTC thermistors
Tinned copper wire, kinked
Coating material flame retardant to UL 94 V-0
Component marking includes the manufacturer's
logo, resistance value and date code
Highly stable electrical characteristics
Approvals
UL 1434 (file number E69802)
IEC (certificate number 101QA12)
VDE (certificate number 40038223)
CQC (0900104539)
Options
Resistance tolerance <20% and alternative lead
configurations available on request
Delivery mode
Bulk (standard), cardboard tape on reel or Ammo pack
Dimensional drawing
Dimensions in mm
Approx. weight 3 g
General technical data
Climatic category (IEC 60068-1) 55/170/21
Max. power (at 25 °C) P
max
3.9 W
Resistance tolerance R
R
/R
R
±20 %
Rated temperature T
R
25 °C
Dissipation factor (in air) δ
th
approx. 20 mW/K
Thermal cooling time constant (in air) τ
c
approx. 80 s
Heat capacity C
th
approx. 1600 mJ/K
Inrush current limiters B57238S0***M0**
ICLs S238
Page 2 of 21Please read Cautions and warnings and
Important notes at the end of this document.
1) For details on the capacitance C
test
please refer to "Application notes", chapter 1.6.
Electrical specification and ordering codes
R
25
I
max
(0...65 °C)
A
C
test
1)
230 V AC
µF
C
test
1)
110 V AC
µF
R
min
(@ I
max
, 25 °C)
Ordering code
** = Delivery mode
00 = Bulk
51 = Reel packing
54 = Ammo packing
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 6 700 2800 0.113 B57238S0709M0**
8 5.5 700 2800 0.131 B57238S0809M0**
10 5 700 2800 0.160 B57238S0100M0**
15 4.4 700 2800 0.210 B57238S0150M0**
16 4 700 2800 0.246 B57238S0160M0**
22 4 700 2800 0.257 B57238S0220M0**
25 3.4 700 2800 0.339 B57238S0250M0**
Inrush current limiters B57238S0***M0**
ICLs S238
Page 3 of 21Please read Cautions and warnings and
Important notes at the end of this document.

B57238S0259M000

Mfr. #:
Manufacturer:
EPCOS / TDK
Description:
ICL 2.5 OHM 20% 8.4A 16MM
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union