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12101C474KAT2A Datasheet(PDF) 93 Page - AVX Corporation

Part # 12101C474KAT2A
Description  AVX Surface Mount Ceramic Capacitor Products
Download  99 Pages
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Manufacturer  AVX [AVX Corporation]
Direct Link  http://www.avx.com
Logo AVX - AVX Corporation

12101C474KAT2A Datasheet(HTML) 93 Page - AVX Corporation

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General Description
In practice the current leads the voltage by some other phase
angle due to the series resistance R
S. The complement of this
angle is called the loss angle and:
Power Factor (P.F.) = Cos
f or Sine
Dissipation Factor (D.F.) = tan
for small values of
the tan and sine are essentially equal
which has led to the common interchangeability of the two
terms in the industry.
Equivalent Series Resistance – The term E.S.R. or
Equivalent Series Resistance combines all losses both
series and parallel in a capacitor at a given frequency so
that the equivalent circuit is reduced to a simple R-C series
Dissipation Factor – The DF/PF of a capacitor tells what
percent of the apparent power input will turn to heat in the
Dissipation Factor =
= (2
π fC) (E.S.R.)
The watts loss are:
Watts loss = (2
π fCV2) (D.F.)
Very low values of dissipation factor are expressed as their
reciprocal for convenience. These are called the “Q” or
Quality factor of capacitors.
Parasitic Inductance – The parasitic inductance of
capacitors is becoming more and more important in the
decoupling of today’s high speed digital systems. The
relationship between the inductance and the ripple voltage
induced on the DC voltage line can be seen from the simple
inductance equation:
V = L di
seen in current microprocessors can be as high as
0.3 A/ns, and up to 10A/ns. At 0.3 A/ns, 100pH of parasitic
inductance can cause a voltage spike of 30mV. While this
does not sound very drastic, with the Vcc for
microprocessors decreasing at the current rate, this can be
a fairly large percentage.
Another important, often overlooked, reason for knowing the
parasitic inductance is the calculation of the resonant
frequency. This can be important for high frequency, by-
pass capacitors, as the resonant point will give the most
signal attenuation. The resonant frequency is calculated
from the simple equation:
fres =
Insulation Resistance – Insulation Resistance is the
resistance measured across the terminals of a capacitor and
consists principally of the parallel resistance RP shown in the
equivalent circuit. As capacitance values and hence the area
of dielectric increases, the I.R. decreases and hence the
product (C x IR or RC) is often specified in ohm farads or
more commonly megohm-microfarads. Leakage current is
determined by dividing the rated voltage by IR (Ohm’s Law).
Dielectric Strength – Dielectric Strength is an expression
of the ability of a material to withstand an electrical stress.
Although dielectric strength is ordinarily expressed in volts, it
is actually dependent on the thickness of the dielectric and
thus is also more generically a function of volts/mil.
Dielectric Absorption – A capacitor does not discharge
instantaneously upon application of a short circuit, but
drains gradually after the capacitance proper has been
discharged. It is common practice to measure the dielectric
absorption by determining the “reappearing voltage” which
appears across a capacitor at some point in time after it has
been fully discharged under short circuit conditions.
Corona – Corona is the ionization of air or other vapors
which causes them to conduct current. It is especially
prevalent in high voltage units but can occur with low voltages
as well where high voltage gradients occur. The energy
discharged degrades the performance of the capacitor and
can in time cause catastrophic failures.
I (Ideal)
I (Actual)

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