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SR217C104GAT Datasheet(PDF) 11 Page - AVX Corporation

Part No. SR217C104GAT
Description  Multilayer CeramicLeaded Capacitors
Download  72 Pages
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Maker  AVX [AVX Corporation]
Homepage  http://www.avx.com
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SR217C104GAT Datasheet(HTML) 11 Page - AVX Corporation

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9
BASIC CAPACITOR FORMULAS
I. Capacitance (farads)
English: C = .224 K A
T
D
Metric: C =
.0884 K A
T
D
II. Energy stored in capacitors (Joules, watt - sec)
E = 12 CV2
III. Linear charge of a capacitor (Amperes)
I = C
dV
dt
IV. Total Impedance of a capacitor (ohms)
Z =
R
2
S +
(XC - XL )2
V. Capacitive Reactance (ohms)
xc =
1
2
π fC
VI. Inductive Reactance (ohms)
xL = 2 π fL
VII. Phase Angles:
Ideal Capacitors: Current leads voltage 90°
Ideal Inductors: Current lags voltage 90°
Ideal Resistors: Current in phase with voltage
VIII. Dissipation Factor (%)
D.F.= tan
(loss angle) = E.S.R. = (2
πfC) (E.S.R.)
Xc
IX. Power Factor (%)
P.F. = Sine
(loss angle) = Cos
f (phase angle)
P.F. = (when less than 10%) = DF
X. Quality Factor (dimensionless)
Q = Cotan
(loss angle) = 1
D.F.
XI. Equivalent Series Resistance (ohms)
E.S.R. = (D.F.) (Xc) = (D.F.) / (2
π fC)
XII. Power Loss (watts)
Power Loss = (2
π fCV2) (D.F.)
XIII. KVA (Kilowatts)
KVA = 2
π fCV2 x 10 -3
XIV. Temperature Characteristic (ppm/°C)
T.C. =
Ct – C25
x 106
C25 (T
t – 25)
XV. Cap Drift (%)
C.D. =
C1 – C2
x 100
C
1
XVI. Reliability of Ceramic Capacitors
L
0 =
V
t
XT
t
Y
L
t
(
V
o )( To )
XVII. Capacitors in Series (current the same)
Any Number:
1
=
1 + 1 --- 1
CT
C1
C2
CN
C1 C2
Two: CT =
C1 + C2
XVIII. Capacitors in Parallel (voltage the same)
CT = C1 + C2 --- + CN
XIX. Aging Rate
A.R. = %D C/decade of time
XX. Decibels
db = 20 log V1
V2
The Capacitor
Pico
X 10-12
Nano
X 10-9
Micro
X 10-6
Milli
X 10-3
Deci
X 10-1
Deca
X 10+1
Kilo
X 10+3
Mega
X 10+6
Giga
X 10+9
Tera
X 10+12
K
= Dielectric Constant
f
= frequency
L
t
= Test life
A
= Area
L
= Inductance
V
t
= Test voltage
T
D
= Dielectric thickness
= Loss angle
V
o
= Operating voltage
V
= Voltage
f
= Phase angle
T
t
= Test temperature
t
= time
X & Y
= exponent effect of voltage and temp.
T
o
= Operating temperature
Rs
= Series Resistance
L
o
= Operating life
METRIC PREFIXES
SYMBOLS


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