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B57234S0400M000

P1-P3P4-P6P7-P9P10-P10
Product division: NTC Product type:S234/ 40/M
Product name: Inrush Current Limiter Ordering code:B57234S0400M000
Data sheet
ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 1/10
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
• 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.
Product division: NTC Product type:S234/ 40/M
Product name: Inrush Current Limiter Ordering code:B57234S0400M000
Data sheet
ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 2/10
DRAWING :
RATINGS AND CHARACTERISTICS
Lower/upper category temperature T [°C] -55/+170
Resistance tolerance
∆R/R
N
[%]
± 20
Rated temperature T
N
[°C] 25
B value tolerance
∆B/B
[%]
± 3
Max. power at 25°C P
max
[W] 3.6
Dissipation factor (in air)
δ
th
[mW/K] approx. 17
Thermal cooling time constant (in air)
τ
th
[s] approx. 90
Heat capacity C
th
[mJ/K] approx. 1530
Ordering Code
R
25
[Ω]
I
max
[A]
B
25/100
[K]
C
T
at 110
VAC
[µF]
C
T
at 230
VAC
[µF]
Parameter
for R(I)
k
Parameter
for R(I)
n
B57234S0400M000 40 3.4 3450 1600 400 1.82 -1.38
b
LS
th
h
LL
LD
b 15.0max mm
th 7.0 max mm
h 22.0 max mm
LL
32
+ 3
mm
LD
0.8
± 0.05
mm
LS
7.5
± 0.8
mm
Approx. weight : 2.0 [g]
Product division: NTC Product type:S234/ 40/M
Product name: Inrush Current Limiter Ordering code:B57234S0400M000
Data sheet
ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 3/10
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
) :
T
1
a
-25 0 65
170
I / I
max
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
0.3 * I
max
< I ≤ I
max
R
NTC
Resistance value to be determined at current I [Ω]
k, n Fit parameter, see table with ordering codes
I 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)
Percent of I
max
=
100 1
65
65
−
−°
−°
TC
TC
A
max
T
A
= ambient temperature ( T
A
> 65°C )
T
max
= 170°C
P1-P3P4-P6P7-P9P10-P10

B57234S0400M000

Mfr. #:
Buy B57234S0400M000
Manufacturer:
EPCOS / TDK
Description:
Inrush Current Limiters S 234/40/M NTC Thermisto
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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