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 6/10
Soldering of Components
Process Conditions Remarks
Soldering Dip soldering : 260°C max, 4 sec max,
6mm min from thermistor body
Iron soldering : 360°C max, 2 sec max,
6 mm min from thermistor body
Low resistance drift
* Electrical cycling Test
Each cycle has to start with parts cooled down to room temperature. It has to cover the portion
of the R/T curve between room temperature and the resistance of the components as
stabilized at the maximum continous current I
max
(that is the minimum operating resistance).
One cycle lasts 7 minutes.
** Maximum switchable capacity test
The capacitor (C
T
) is discharged across a series fixed resistor and the thermistor, shown in
Figure 2. The charge voltage is chosen so that the voltage applied to the thermistor at the
beginning of discharge is 170/345 [V], corresponding to (110/230V+∆V)*1.41.
The capacitor is discharged across a series fixed resistor and the thermistor 1 000 times at
ambient temperature of between 15°C and 35°C. Each cycle has to start with thermistors
cooled down to ambient temperature.
Fig. 2. - Maximum switchable capacity measuring circuit
TAPING AND PACKING :
Packing codes :
The last two digits of the complete ordering code state the packing mode :
Packing Code
Number of
Pieces
Bulk packing Bulk 00 500
Reel packing Tape 51 1000
AMMO packing Tape 54 750
L
C
T
V
NTC
S
R
NTC
L
T
NTC
S
NTC
V
V ... Load voltage
C ... Test capacitance
R ... Fixed resistance
V ... Voltage drop across the NTC
V = 170/345 V
(corresponds (110/230 V + dV) x 1.41)
R = 1 Ohm
