Information

HDC Series - High Voltage Ceramic Disc Capacitors
Holy Stone
-42 -
(1) Operating Voltage:
W
hen DC-rated capacitors are to be used in AC or ripple current circuits, 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 applied to the circuit, starting or stopping may generate an irregular voltage for a transit
period because of resonance or switching. Be sure to use a capacitor with a rated voltage range that
includes these irregular voltages.
(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 similar current, it may self-generate heat due to dielectric loss. The
frequency of the applied sine wave voltage should be less than 100kHz. The applied voltage load should
be such that the capacitor's self-generated heat is within 20
C at an atmosphere temperature of 25 C. When
measuring, use a thermocouple of small thermal capacity-K of ø0.1mm in conditions where the capacitor is
not affected by radiant heat from other components or surrounding ambient fluctuations.
Excessive heat may lead to deterioration of the capacitor's characteristics and reliability. (Never attempt to
perform measurement with the cooling fan running. Otherwise, accurate measurement cannot be ensured.)
(3) 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.
(4) Operating and storage environment
The insulating coating of capacitors does not form a perfect seal; therefore, do not use or store capacitors
in a corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt or the like are
present, and avoid exposure to moisture. Before cleaning, bonding or molding this product, verify that these
processes do not affect product quality by testing the performance of a cleaned, bonded or molded product
in the intended equipment. Store the capacitors where the temperature and relative humidity do not
exceed –10 to 40 degrees centigrade and 15 to 85 %.
Use capacitors within 6 months.
(5) Vibration and impact
Do not expose a capacitor or its leads to excessive shock or vibration during use.
 Caution