5. DC Voltage and AC Voltage Characteristic

1. The capacitance value of a high dielectric constant type

capacitor changes depending on the DC voltage applied.

Please consider the DC voltage characteristics when a

capacitor is selected for use in a DC circuit.

1-1. The capacitance of ceramic capacitors may change

sharply depending on the applied voltage. (See figure)

Please confirm the following in order to secure the

capacitance.

(1) Determine whether the capacitance change caused

by the applied voltage is within the allowed range .

(2) In the DC voltage characteristics, the rate of

capacitance change becomes larger as voltage

increases, even if the applied voltage is below

the rated voltage. When a high dielectric constant

type capacitor is used in a circuit that requires a

tight (narrow) capacitance tolerance (e.g., a time

constant circuit), please carefully consider the

voltage characteristics, and confirm the various

characteristics in the actual operating conditions

　

of the system.

2. The capacitance values of high dielectric

constant type capacitors changes depending

on the AC voltage applied.

Please consider the AC voltage characteristics

when selecting a capacitor to be used in a

AC circuit.

6. Capacitance Aging

[ Example of Change Over Time (Aging characteristics) ]

1. The high dielectric constant type capacitors

have an Aging characteristic in which the capacitance

value decreases with the passage of time.

When you use a high dielectric constant type

capacitors in a circuit that needs a tight (narrow)

capacitance tolerance (e.g., a time-constant circuit),

please carefully consider the characteristics

of these capacitors, such as their aging, voltage,

and temperature characteristics. In addition,

check capacitors using your actual appliances

at the intended environment and operating conditions.

7.Vibration and Shock

1. Please confirm the kind of vibration and/or shock, its condition, and any generation of resonance.

Please mount the capacitor so as not to generate resonance, and do not allow any impact on the terminals.

2. Mechanical shock due to being dropped may cause damage or

a crack in the dielectric material of the capacitor.

Do not use a dropped capacitor because the quality and reliability

may be deteriorated.

3. When printed circuit boards are piled up or handled, the corner

　of another printed circuit board

should not be allowed to hit the capacitor in order to avoid

a crack or other damage to the capacitor.

Caution

-100

-80

-60

-40

-20

0

20

0

10

20

30

DC Voltage (V)

40

50

[Example of DC Voltage Characteristics]

0.1μF, Rated Voltage 50VDC

0

0.5

1

AC Voltage (Vr.m.s.)

1.5

2

[Example of AC Voltage Characteristics]

10μF, Rated Voltage 6.3VDC

30

20

10

0

-10

-20

-30

-40

-50

-60

Floor

Crack

Mounting printed circuit board

Crack

!

20

10

0

-10

-20

-30

-40

10

100

1000

10000

Time(h)

C0G(5C)

X7R(R7)

X5R(R6)

JEMCGC-2701X

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