Datasheet

Reliability data
Test Standard Test conditions ∆R
25
/R
25
(typical)
Remarks
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
T: 170 °C
t: 1000 h
< 10% No visible
damage
Storage in damp
heat, steady state
IEC
60068-2-78
Temperature of air: 40 °C
Relative humidity of air: 93%
Duration: 21 days
< 5% No visible
damage
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature: 55 °C
Upper test temperature: 170 °C
Number of cycles: 10
< 10% No visible
damage
Endurance I = I
max
t: 1000 h
< 10% No visible
damage
Cyclic
endurance
I = I
max
, 1000 cycles
On-time = 1 min
Cooling time = 6 min
< 10% No visible
damage
Transient
load
Capacitance = C
test
Number of cycles: 1000
< 5% No visible
damage
Note
The self-heating of a thermistor during operation depends on the load applied and the
applicable dissipation factor.
When loaded with maximum allowable current/power and the specified dissipation factor is
taken as a basis, the NTC thermistor may reach a mean temperature of up to 250 °C.
The heat developed during operation will also be dissipated through the lead wires. So the
contact areas, too, may become quite hot at maximum load.
When mounting NTC thermistors you have to ensure that there is an adequate distance
between the thermistor and all parts which are sensitive to heat or combustible.
Inrush current limiters B57237
ICLs S237
Page 3 of 15Please read Cautions and warnings and
Important notes at the end of this document.