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C066G102J1C0G5CM Datasheet(PDF) 5 Page - Kemet Corporation

Part # C066G102J1C0G5CM
Description  CERAMIC MOLDED/AXIAL & RADIAL - MIL-PRF-20
Download  23 Pages
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Manufacturer  KEMET [Kemet Corporation]
Direct Link  http://www.kemet.com
Logo KEMET - Kemet Corporation

C066G102J1C0G5CM Datasheet(HTML) 5 Page - Kemet Corporation

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© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
3
and dissipa-
e. The max-
e
defines a “box”
es and
Within this
upon the spe-
KEMET capaci-
temperature.
-
Effect of Temperature: Both capacitance
tion factor are affected by variations in temperatur
imum capacitance change with temperature is defined by th
temperature characteristic. However, this only
bounded by the upper and lower operating temperatur
the minimum and maximum capacitance values.
“box”, the variation with temperature depends
cific dielectric formulation. Typical curves for
tors are shown in Figures 3 and 4. These figures also include
the typical change in dissipation factor for KEMET capacitors.
Insulation resistance decreases with
Typically, the insulation resistance at maximum rated temper
ature is 10% of the 25ºC value.
EFFECT OF APPLIED VOLTAGE
1
2
3
4
+10
+5
0
-5
-10
0.1
1
10
100
AC or DC Volts Applied
Typical Effects of 1000 Hz AC and DC Voltage Level on
Capacitance and Dissipation Factor - X7R
Note: C0G Dielectric capacitance and dissipation factor are
stable with voltage.
Figure 6.
DC
AC
AC
DC
Effect of Voltage: Class I ceramic capacitors are not
affected by variations in applied AC or DC voltages. For Class
II and III ceramic capacitors, variations in voltage affect only
the capacitance and dissipation factor. The application of DC
voltage higher than 5 vdc reduces both the capacitance and
dissipation factor. The application of AC voltages up to 10-20
Vac tends to increase both capacitance and dissipation factor
At higher AC voltages, both capacitance and dissipation factor
begin to decrease.
Typical curves showing the effect of applied AC and DC
voltage are shown in Figure 6 for KEMET X7R capacitors.
APPLICATION NOTES FOR MULTILAYER CERAMIC CAPACITORS
Effect of Frequency: Frequency affects both capaci-
tance and dissipation factor. Typical curves for KEMET multi-
layer ceramic capacitors are shown in Figures 8 and 9.
The variation of impedance with frequency is an impor-
tant consideration in the application of multilayer ceramic
capacitors. Total impedance of the capacitor is the vector of the
capacitive reactance, the inductive reactance, and the ESR, as
illustrated in Figure 2. As frequency increases, the capacitive
reactance decreases. However, the series inductance (L)
shown in Figure 1 produces inductive reactance, which
increases with frequency. At some frequency, the impedance
ceases to be capacitive and becomes inductive. This point, at
the bottom of the V-shaped impedance versus frequency
curves, is the self-resonant frequency. At the self-resonant fre-
quency, the reactance is zero, and the impedance consists of
the ESR only.
Typical impedance versus frequency curves for KEMET
multilayer ceramic capacitors are shown in Figures 10 and 11.
These curves apply to KEMET capacitors in chip form, without
leads. Lead configuration and lead length have a significant
impact on the series inductance. The lead inductance is
approximately 10nH/inch, which is large compared to the
inductance of the chip. The effect of this additional inductance
is a decrease in the self-resonant frequency, and an increase
in impedance in the inductive region above the self-resonant
frequency.
Effect of Time: The capacitance of Class II and III
dielectrics change with time as well as with temperature, volt-
age and frequency. This change with time is known as “aging.”
It is caused by gradual realignment of the crystalline structure
of the ceramic dielectric material as it is cooled below its Curie
temperature, which produces a loss of capacitance with time.
The aging process is predictable and follows a logarithmic
decay. Typical aging rates for C0G and X7R dielectrics are as
follows:
C0G
None
X7R
2.0% per decade of time
Typical aging curves for X7R dielectrics is shown in
Figure 12.
The aging process is reversible. If the capacitor is heat-
ed to a temperature above its Curie point for some period of
time, de-aging will occur and the capacitor will regain the
capacitance lost during the aging process. The amount of de-
aging depends on both the elevated temperature and the
length of time at that temperature. Exposure to 150ºC for one-
half hour or 125ºC for two hours is usually sufficient to return
the capacitor to its initial value.
Because the capacitance changes rapidly immediately
after de-aging, capacitance measurements are usually delayed
for at least 10 hours after the de-aging process, which is often
referred to as the “last heat.” In addition, manufacturers utilize


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