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12101C474KAT2A Datasheet(PDF) 90 Page - AVX Corporation

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

12101C474KAT2A Datasheet(HTML) 90 Page - AVX Corporation

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89
In specifying capacitance change with temperature for Class
2 materials, EIA expresses the capacitance change over an
operating temperature range by a 3 symbol code. The first
symbol represents the cold temperature end of the tempera-
ture range, the second represents the upper limit of the
operating temperature range and the third symbol represents
the capacitance change allowed over the operating temper-
ature range. Table 1 provides a detailed explanation of the EIA
system.
Effects of Voltage – Variations in voltage have little effect
on Class 1 dielectric but does affect the capacitance and
dissipation factor of Class 2 dielectrics. The application of DC
voltage reduces both the capacitance and dissipation factor
while the application of an AC voltage within a reasonable
range tends to increase both capacitance and dissipation
|factor readings. If a high enough AC voltage is applied,
eventually it will reduce capacitance just as a DC voltage will.
Figure 2 shows the effects of AC voltage.
Capacitor specifications specify the AC voltage at which to
measure (normally 0.5 or 1 VAC) and application of the wrong
voltage can cause spurious readings. Figure 3 gives the volt-
age coefficient of dissipation factor for various AC voltages at
1 kilohertz. Applications of different frequencies will affect the
percentage changes versus voltages.
Typical effect of the application of DC voltage is shown in
Figure 4. The voltage coefficient is more pronounced for
higher K dielectrics. These figures are shown for room tem-
perature conditions. The combination characteristic known as
voltage temperature limits which shows the effects of rated
voltage over the operating temperature range is shown in
Figure 5 for the military BX characteristic.
General Description
Figure 2
50
40
30
20
10
0
12.5
25
37.5
50
Volts AC at 1.0 KHz
Cap. Change vs. A.C. Volts
X7R
Figure 3
Curve 3 - 25 VDC Rated Capacitor
Curve 2 - 50 VDC Rated Capacitor
Curve 1 - 100 VDC Rated Capacitor
Curve 3
Curve 2
Curve 1
.5
1.0
1.5
2.0
2.5
AC Measurement Volts at 1.0 KHz
10.0
8.0
6.0
4.0
2.0
0
D.F. vs. A.C. Measurement Volts
X7R
EIA CODE
Percent Capacity Change Over Temperature Range
RS198
Temperature Range
X7
-55°C to +125°C
X6
-55°C to +105°C
X5
-55°C to +85°C
Y5
-30°C to +85°C
Z5
+10°C to +85°C
Code
Percent Capacity Change
D
±3.3%
E
±4.7%
F
±7.5%
P
±10%
R
±15%
S
±22%
T
+22%, -33%
U
+22%, - 56%
V
+22%, -82%
MIL CODE
Symbol
Temperature Range
A
-55°C to +85°C
B
-55°C to +125°C
C
-55°C to +150°C
Symbol
Cap. Change
Cap. Change
Zero Volts
Rated Volts
R
+15%, -15%
+15%, -40%
S
+22%, -22%
+22%, -56%
W
+22%, -56%
+22%, -66%
X
+15%, -15%
+15%, -25%
Y
+30%, -70%
+30%, -80%
Z
+20%, -20%
+20%, -30%
Table 1: EIA and MIL Temperature Stable and General
Application Codes
EXAMPLE – A capacitor is desired with the capacitance value at 25°C to
increase no more than 7.5% or decrease no more than 7.5% from
-30°C to +85°C. EIA Code will be Y5F.
Temperature characteristic is specified by combining range and change
symbols, for example BR or AW. Specification slash sheets indicate the
characteristic applicable to a given style of capacitor.


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