Information

 Caution (Rating)
SDC Series - Safety Disc Capacitors
Holy Stone
-46 -
(1) Operating Voltage
Be sure to maintain the Vp-p value of the applied voltage or the Vo-p which contains a DC bias
within the rated voltage range.
When the voltage is started to apply to the circuit or it is stopped applying, the irregular voltage
may be generated for a transit period because of resonance or switching. Be sure to use a capacitor
within rated voltage containing this irregular voltage.
(2) Operating Temperature and Self-generated Heat
Keep the surface temperature of a capacitor below the upper limit of its rated operating
temperature range. Be sure to take into account the heat generated by the capacitor itself. When the
capacitor is used in a high-frequency current, pulse current or the like, it may have the
self-generated heat due to dielectric-loss.
Applied voltage should be the load such as self-generated heat is within 20
on the condition of
atmosphere temperature 25 . When measuring, use a thermocouple of small thermal capacity-K
of 0.1mm and be in the condition where capacitor is not affected by radiant heat of other
components and wind of surroundings. Excessive heat my lead to deterioration of the capacitor’s
characteristics and reliability.
(3) Test condition for withstanding Voltage
I. Test Equipment
Test equipment for AC withstanding voltage shall be used with the performance of the wave
similar to 50/60 Hz sine waves.
If a distorted sine wave or over load exceeding the specified voltage value is applied, a
failure may be caused.
II. Voltage Applied Method
When the withstand voltage is applied, the capacitor’s leads or terminals shall be firmly
connected to the output of the withstand voltage test equipment, and then the voltage shall
be raised from near zero to the test voltage.
If the test voltage is applied directly to capacitor, the test voltage should be applied at the *zero cross
point. At the end of the test time, the test voltage shall be reduced to near zero, and then capacitor's
lead or terminal shall be taken off the output of the withstand voltage test equipment.
If the test voltage is not applied from the near zero voltage point and applied directly to
capacitor, a surge voltage may arise, and cause the capacitor to fail.
* ZERO CROSS is the point where voltage sine wave
pass 0V.- See the right figure.
(4) Fail-Safe
It should be assumed that if the capacitor fails, it will fail in short circuit mode. Be sure to provide an
appropriate fail-safe function, like a fuse in your circuit, if failure would cause an electric shock, fire or
fumes.