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| 型号： | CCCR05Cxxx |
| 厂商： | AVX Corporation |
| 英文描述： | Multiayer Ceramic Leaded Capacitors |
| 中文描述： | Multiayer引线陶瓷电容器 |
| 文件页数： | 70/71页 |
| 文件大小： | 1096K |
| 代理商： | CCCR05CXXX |
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7
Impedance vs. Frequency
Effect of Capacitance – AVX SpinGuards
Impedance vs. Frequency
Effect of Dielectric – AVX DIPGuards
Impedance vs. Frequency
Effect of Lead Length – Military CKR05 .01mF
Typical Curve of Aging Rate
X7R Dielectric
Effects of Mechanical Stress – High “K” dielectric ceramic
capacitors exhibit some low level piezoelectric reactions
under mechanical stress. As a general statement, the
piezoelectric output is higher, the higher the dielectric con-
stant of the ceramic. It is desirable to investigate this effect
before using high “K” dielectrics as coupling capacitors in
extremely low level applications.
Reliability – Historically ceramic capacitors have been one
of the most reliable types of capacitors in use today.
The approximate formula for the reliability of a ceramic
capacitor is:
L
o
=
V
t
X
T
t
Y
L
t
V
o
T
o
where
Lo = operating life
Tt = test temperature and
L t = test life
To = operating temperature in °C
V t = test voltage
Vo = operating voltage X,Y = see text
Historically for ceramic capacitors exponent X has been
considered as 3. The exponent Y for temperature effects
typically tends to run about 8.
The Capacitor
.001mF
.01mF
.1mF
.33mF
1
10
100
1000
Log Frequency, MHz
Log
Impedance,
Ohms
10.00
1.00
0.10
0.01
1
10
100
200
Log Frequency, MHz
Log
Impedance,
Ohms
10.0
1.0
0.1
C0G
(NP0)
.001
F
X7R
.01
F
X7R
.022
F
X7R
.047
F
X7R
0.1
F
Z5U
.22
F
1
10
100
1000
Log Frequency, MHz
Log
Impedance,
Ohms 10.0
1.0
0.1
100.0
.500"
.250"
.062"
0"
1
10
100
1000 10,000 100,000
Hours
Capacitance
Change
Percent
+1.5
0
-1.5
-3.0
-4.5
-6.0
-7.5
Characteristic
Max. Aging Rate %/Decade
C0G (NP0)
X7R
Z5U
Y5V
None
2
3
5
Figure 9
Figure 8
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