08055C473KAT2A AVX Corporation, 08055C473KAT2A Datasheet - Page 14

• Manufacturer Part Number: 08055C473KAT2A
• Description: CAP CERM .047UF 10% 50V X7R 0805
• Manufacturer: AVX Corporation

Specifications of 08055C473KAT2A

• Capacitance: 0.047µF
• Package / Case: 0805 (2012 Metric)
• Voltage - Rated: 50V
• Tolerance: ±10%
• Temperature Coefficient: X7R
• Mounting Type: Surface Mount, MLCC
• Operating Temperature: -55°C ~ 125°C
• Applications: General Purpose
• Size / Dimension: 0.079" L x 0.049" W (2.00mm x 1.25mm)
• Thickness: 0.94mm Max
• Tolerance (+ Or -): 10%
• Voltage: 50VDC
• Temp Coeff (dielectric): X7R
• Operating Temp Range: -55C to 125C
• Mounting Style: Surface Mount
• Construction: SMT Chip
• Case Style: Ceramic Chip
• Failure Rate: Not Required
• Wire Form: Not Required
• Product Length (mm): 2.01mm
• Product Depth (mm): 1.25mm
• Product Height (mm): 0.94mm
• Product Diameter (mm): Not Requiredmm
• Dielectric Characteristic: X7R
• Capacitance Tolerance: ± 10%
• Voltage Rating: 50VDC
• Capacitor Case Style: 0805
• No. Of Pins: 2
• Capacitor Mounting: SMD
• Rohs Compliant: Yes
• Brand/series: AVX
• Case Size: 0805
• Dielectric Strength: No breakdown or visual defects
• Dissipation Factor: 2.5 %
• Dissipation Factor, Test Condition: (Max.)
• Insulation Resistance: 100000 Megohms
• Length: 0.079 in. ± 0.008 in.
• Material, Element: Ceramic
• Temperature, Operating, Maximum: 125 °C
• Temperature, Operating, Minimum: -55 °C
• Termination: SMT
• Voltage, Rating: 50 VDC
• Width: 0.049 in. ± 0.008 in.
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Ratings: -
• Lead Spacing: -
• Lead Free Status / Rohs Status: RoHS Compliant part
• Other names: 478-1391-2

General Description
In practice the current leads the voltage by some other
phase angle due to the series resistance R
ment of this angle is called the loss angle and:
for small values of
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
connection.
Dissipation Factor – The DF/PF of a capacitor tells what
percent of the apparent power input will turn to heat in the
capacitor.
The watts loss are:
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 capac-
itors is becoming more and more important in the decou-
pling 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:
Dissipation Factor =
Watts loss = (2 π fCV
Loss
Angle
Power Factor (P.F.) = Cos
Dissipation Factor (D.F.) = tan
I (Ideal)
V = L di
E.S.R.
IR
I (Actual)
the tan and sine are essentially equal
f
s
dt
2
E.S.R.
) (D.F.)
X
C
Phase
Angle
= (2 π fC) (E.S.R.)
f
or Sine
C
S
. The comple-
V
The
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 microproces-
sors 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:
Insulation Resistance – Insulation Resistance is the
resistance measured across the terminals of a capacitor
and consists principally of the parallel resistance R
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
faradsor 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 dis-
charged. 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.
dt
di
seen in current microprocessors can be as high as
f
res
=
2
1
LC
P
shown
69