Dielectric Characteristics
CLASS II DIELECTRICS
Capacitors of this type have a dielectric constant range of 1000-
4000 and also have a nonlinear temperature characteristic that
exhibits a dielectric constant variation of less than 15ꢀ (2R1)
from its room temperature value, over the specified temperature
range. Generally used for bypassing (decoupling), coupling,
filtering, frequency discrimination, DC blocking and voltage transient
suppression with greater volumetric efficiency than Class I units,
while maintaining stability within defined limits.
Capacitance and dissipation factors are affected by:
a) Time (Aging)
b) Voltage (AC or DC)
c) Frequency
CLASS II DIELECTRICS
X5R
X7R (2R1)
X8R
Class II High Temperature
Stable
Stable
Stable
Stable
-
Dielectric
classifications
-
2C1
-
2R1
2X1
-
-
-
-
-
-
IECQ-CECC
EIA
X5R
X7R (2R1)
X8R
-
-
BZ
-
BX
-
-
MIL
-
DLI
BW
P
-
R
-
B, RB
X
B
-
S
N
-
G
-
E, RE
Novacap
Syfer
Ordering code
X
X
X
-
-
-
Voltronics
Rated
temperature range
-55ºC to +85ºC
-55ºC to +125ºC
-55ºC to +150ºC
-55ºC to +160ºC
+15 -40ꢀ
-55ºC to +200ºC
+15 -65ꢀ
-
15ꢀ
-
15ꢀ
15ꢀ
-
15ꢀ
15ꢀ
-
No DC voltage applied
Maximum capacitance
change over
temperature range
Rated DC
voltage applied
+15 -45ꢀ
+15 -25ꢀ
-
>25V ≤0.025
≤25V ≤0.035
Tangent of loss
angle (tan ð)
≤ 0.025 Typical*
≤0.025
≤0.025
-
100GΩ or 1000s (whichever is the least)
5ꢀ, 10ꢀ, 20ꢀ
Time constant (Ri x Cr)
-
Insulation resistance (Ri)
Capacitance tolerance
2.5 times
≤200V
Dielectric strength.
Voltage applied
for 5 seconds.
Rated voltage +250V
>200V to <500V
1.5 times
1.2 times
500V to <1kV
≥1kV
Charging current limited
to 50mA
maximum.
55/85/56
55/125/56
55/150/56
-
-
-
Chip
-
-
55/125/21
55/125/56
-
-
Dipped
Discoidal
Climatic category (IEC)
Aging
characteristic (Typical)
5ꢀ Typical
-
<2ꢀ per time decade
-
QC-32100
-
-
QC-32100
-
Syfer chip
Approvals
* Refer to the MLC Capacitors catalog for details of Dissipation Factor.
5
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