Product division: NTC
Product name: Inrush Current Limiter
Data sheet
Product type:S234/xxx/M
Ordering code:B57234S0xxxM000
APPLICATION :
NTC-thermistor for inrush current limiting in peripheral communication equipment, e.g.
in switch-mode power supplies
FEATURES :
•
•
•
•
•
•
•
•
•
•
•
Black coated thermistor disk
Coating material is flame retardant (UL 94 V-0 approved)
Kinked leads of tinned copper wire
Lead spacing 7.5 mm
Manufacturer’s logo, NTC and resistance value stamped in white
High stability of electrical characteristic
Terminals solderable in accordance with IEC 60068-2-20, test ta, method 1
ICL support to fulfill the requirements according EN 61000 of power circuits
Usable in series connections up to 265 V
rms
UL approval (E 69802)
The component is compliant with ROHS (DIRECTIVE 2002/95/EC OF THE
EUROPEAN PARLIAMENT AND THE COUNCIL of 27 January 2003 on the
restriction of the use of certain hazardous substances in electrical and electronic
equipment
Also available on tape
•
EPCOS AG 2005. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
Purchase orders are subject to the General Conditions for the Supply of Products and Services of the Electrical and
Electronics Industry recommended by the ZVEI (German Electrical and Electronic Manufacturers' Association), unless
otherwise agreed.
ISSUE DATE
11.05.05
ISSUE
b
PUBLISHER
KB S PE
PAGE
1/19
Product division: NTC
Product name: Inrush Current Limiter
Data sheet
Product type:S234/xxx/M
Ordering code:B57234S0xxxM000
DRAWING :
b
th
h
b
th
h
LL
LD
LS
15.0max
7.0 max
22.0 max
+3
32
0.8
±
0.8
7.5
±
0.05
mm
mm
mm
mm
mm
mm
LL
LS
Approx. weight : 2.0 [g]
LD
RATINGS AND CHARACTERISTICS
Lower/upper category temperature
Resistance tolerance
Rated temperature
B value tolerance
Max. power at 25°C
Dissipation factor (in air)
Thermal cooling time constant (in air)
Heat capacity
T
∆R/R
N
T
N
∆B/B
P
max
δ
th
τ
th
C
th
[°C]
[%]
[°C]
[%]
[W]
[mW/K]
[s]
[mJ/K]
-55/+170
±
20
25
±
3
3.6
approx. 17
approx. 90
approx. 1530
R
25
Ordering Code
B57234S0109M000
B57234S0229M000
B57234S0259M000
B57234S0479M000
B57234S0509M000
B57234S0709M000
B57234S0100M000
B57234S0150M000
B57234S0220M000
B57234S0330M000
ISSUE DATE
I
max
[A]
11.5
9.0
8.4
6.6
6.4
6.0
5.0
4.0
4.0
3.3
ISSUE
B
25/100
[K]
2600
2800
2800
2900
2900
3000
3060
3000
3300
3300
b
[Ω]
1.0
2.2
2.5
4.7
5.0
7.0
10
15
22
33
C
T
at 110 C
T
at 230 Parameter Parameter
VAC
VAC
for R(I)
for R(I)
k
n
[µF]
[µF]
2800
700
0.622
-1.27
2800
700
0.806
-1.30
2000
500
0.843
-1.30
2800
700
1.03
-1.32
2800
700
1.05
-1.32
2800
700
1.16
-1.33
2800
700
1.29
-1.34
2800
700
1.49
-1.33
2800
700
1.57
-1.37
3600
900
1.78
-1.37
PUBLISHER
KB S PE
PAGE
2/19
11.05.05
Product division: NTC
Product name: Inrush Current Limiter
Data sheet
Product type:S234/xxx/M
Ordering code:B57234S0xxxM000
Maximum continuous current I
max
:
The I
max
denotes the maximum permissable continuous current (dc or rms values for sine-shaped
ac) in the temperature range 0 to 65°C.
Maximum current derating (I / I
max
) :
I / I
max
Percent of I
max
=
100
1
−
1
T
A
−
65
°
C
T
max
−
65
°
C
T
A
= ambient temperature ( T
A
> 65°C )
T
max
= 170°C
-25
0
65
170
Ta
Fig. 1. - Maximum current derating (I / I
max
)
Maximum switchable capacity (C
T
) :
The maximum switchable capacity (C
T
) is the maximum capacity which may be discharged
across the thermistor. See Fig.2 Maximum switchable capacity measuring circuit.
Dependence of NTC resistance on current :
The resistance effective in the usual current range can be approximated with the fit parameter
k
and
n.
R
NTC
=
k
* I
n
R
NTC
k, n
I
0.3 * I
max
< I
≤
I
max
Resistance value to be determined at current I [Ω]
Fit parameter, see table with ordering codes
Current flowing through the NTC (insert numerical value in A)
The calculated values only serve as an estimate for operation in still air at an ambient temperature
of 25°C.
MARKING :
•
•
•
•
EPCOS – logo
resistance value
NTC
Date code with 4 digits (year and week of production): 0540 (example for week 40 in year 2005)
ISSUE DATE
11.05.05
ISSUE
b
PUBLISHER
KB S PE
PAGE
3/19
Product division: NTC
Product name: Inrush Current Limiter
Data sheet
Product type:S234/xxx/M
Ordering code:B57234S0xxxM000
Resistance - Temperature Curve
100.00
B57234S0109Mxxx
10.00
Resistance [Ohm]
1.00
0.10
0.01
-50.00
-25.00
0.00
25.00
50.00
75.00
100.00
125.00
150.00
175.00
Temperature [°C]
ISSUE DATE
11.05.05
ISSUE
b
PUBLISHER
KB S PE
PAGE
4/19
Product division: NTC
Product name: Inrush Current Limiter
Data sheet
Product type:S234/xxx/M
Ordering code:B57234S0xxxM000
Resistance - Temperature Curve
100.00
B57234S0229Mxxx
10.00
Resistance [Ohm]
1.00
0.10
0.01
-50.00
-25.00
0.00
25.00
50.00
75.00
100.00
125.00
150.00
175.00
Temperature [°C]
ISSUE DATE
11.05.05
ISSUE
b
PUBLISHER
KB S PE
PAGE
5/19
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