C85E.pdf

Jul.13,2011

When 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 that contains DC bias within

the rated voltage range.

When the voltage is applied to the circuit, starting or

stopping may generate 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.

When using the low-dissipation DEA (SL Char.) /DEC (SL

Char.) /DEH (C, R Char.) /DES (D Char.) series in a high-

frequency and high-voltage circuit, be sure to read the

instructions in item 4.

When DC-rated capacitors are to be used in input circuits

from commercial power source (AC filter), be sure to use

Safety Certified Capacitors because various regulations

on withstand voltage or impulse withstand established for

each type of equipment should be taken into consideration.

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

300kHz. The applied voltage load (*) should be such that

the capacitor's self-generated heat is within 20

°C in an

atmospheric 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.)

*Before using the low-dissipation DEA/DEC (SL Char.)

/DEH/DES series, be sure to read the instructions in

item 4.

Voltage

Positional

Measurement

DC Voltage

DC+AC Voltage

AC Voltage

Pulse Voltage (1)

Pulse Voltage (2)

Vp-p

Vp-p

Vp-p

1. Operating Voltage

<DES/DEH/DEA/DEB/DEC Series>

2. Operating Temperature and Self-generated Heat

When the capacitor is broken, failure may result in a short

circuit. Be sure to provide an appropriate fail-safe

function like a fuse on your product if failure could follow

an electric shock, fire or fume.

3. Fail-Safe

Continued on the following page.

s !Caution (Rating)

High Voltage Ceramic Capacitors !Caution

60

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• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.