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C052K102K5X5CS Datasheet(PDF) 4 Page - Kemet Corporation

Part # C052K102K5X5CS
Description  MULTILAYER CERAMIC CAPACITORS/AXIAL & RADIAL LEADED
Download  15 Pages
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Manufacturer  KEMET [Kemet Corporation]
Direct Link  http://www.kemet.com
Logo KEMET - Kemet Corporation

C052K102K5X5CS Datasheet(HTML) 4 Page - Kemet Corporation

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Effect of Temperature: Both capacitance and dissipa-
tion factor are affected by variations in temperature. The max-
imum capacitance change with temperature is defined by the
temperature characteristic. However, this only defines a “box”
bounded by the upper and lower operating temperatures and
the minimum and maximum capacitance values. Within this
“box”, the variation with temperature depends upon the spe-
cific dielectric formulation. Typical curves for KEMET capaci-
tors are shown in Figures 3, 4, and 5. These figures also
include the typical change in dissipation factor for KEMET
capacitors.
Insulation resistance decreases with temperature.
Typically, the insulation resistance at maximum rated temper-
ature is 10% of the 25°C value.
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 and
Figure 7 for KEMET Z5U 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, 11, and
12. These curves apply to KEMET capacitors in chip form, with-
out 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, X7R, and Z5U dielectrics
are as follows:
C0G
None
X7R
2.0% per decade of time
Z5U
5.0% per decade of time
Typical aging curves for X7R and Z5U dielectrics are
shown in Figure 13.
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 150°C for one-
half hour or 125°C 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
the aging rates to set factory test limits which will bring the
capacitance within the specified tolerance at some future time,
to allow for customer receipt and use. Typically, the test limits
are adjusted so that the capacitance will be within the specified
tolerance after either 1,000 hours or 100 days, depending on
the manufacturer and the product type.
© KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300
7
APPLICATION NOTES FOR MULTILAYER
CERAMIC CAPACITORS


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