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B57234S0709M

Inrush Current Limiter

EPCOS AG 

Product division: NTC

Product name: Inrush Current Limiter

Data sheet

Product type:S234/xxx/M

Ordering code:B57234S0xxxM000

Maximum continuous current Imax :

The Imax 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 / Imax) :

I / Imax

1

Percent of Imax

=

100



1



−

TA − 65° C

Tmax − 65° C







-25 0

65

170

Ta

Fig. 1. - Maximum current derating (I / Imax )

TA = ambient temperature ( TA > 65°C )

Tmax = 170°C

Maximum switchable capacity (CT) :

The maximum switchable capacity (CT) 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.

RNTC = k * In

0.3 * I max < I ≤ I max

RNTC

k, n

I

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

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