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) Whether the capacitance change caused by the
applied voltage is within the range allowed or not.
□
DC voltage characteristics
(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 in a
circuit that needs a tight (narrow) capacitance tolerance.
Example: a time constant circuit., please carefully
consider the characteristics of these capacitors, such as
their aging, voltage, and temperature characteristics.
And check capacitors using your actual appliances at the
intended environment and operating conditions.
2. The capacitance values of high dielectric constant type capacitors change depending on the AC voltage applied.
Please consider the AC voltage characteristics when selecting a capacitor to be used in a AC circuit.
□
AC voltage characteristics
6. Capacitance Aging
1. The high dielectric constant type capacitors have the characteristic
in which the capacitance value decreases with passage of time.
When you use a high dielectric constant type capacitors in a circuit that needs a tight (narrow) capacitance
tolerance. Example: a time constant circuit., please carefully consider the characteristics of these capacitors,
such as their aging, voltage, and temperature characteristics.
And check capacitors using your actual appliances at the intended environment and operating conditions.
Caution
-60
-50
-40
-30
-20
-10
0
10
20
30
0.0
0.5
1.0
1.5
2.0
2.5
C
a
p
a
ci
ta
n
ce
C
h
a
n
g
e
(%
)
AC Voltage (Vr.ms.)
-100
-80
-60
-40
-20
0
20
0
2
4
6
8
Cap
a
ci
ta
n
ce
Cha
n
g
e
(%
)
DC Voltage (VDC)
-40
-30
-20
-10
0
10
20
10.0
100.0
1000.0
10000.0
Ca
p
a
c
it
o
r
Ch
a
n
g
e
(
%
)
Time (Hr)
5
C
!
JEMCNC-0012L
11
