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! Note ? Please read rating and ! CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
? This catalog has only typical speci?cations. Therefore, please approve our product speci?cations or transact the approval sheet for product speci?cations before ordering.
! Caution
Continued from the preceding page.
<Design Tool>
C03E.pdf
May.17,2013
· Simsurfing
Simsurfing is a web application to display the
characteristics charts and download the characteristics
data of our products. The frequency characteristics,
temperature characteristics, bias characteristics etc. can
be checked.
(Address: http://www.murata.com/simsurfing/)
· Medium Voltage Ceramic Capacitor Selection Tool
The selection tool "Murata Medium Voltage Capacitors
Selection Tool by Voltage Form" is installed in the above
SimSurfing, where the usability of the preferred medium
voltage ceramic capacitors can be determined according
to the application including automobiles.
5. DC Voltage and AC Voltage Characteristics
1. The capacitance value of a high dielectric constant type
capacitor changes depending on the DC voltage applied.
Please consider the DC voltage characteristics when a
capacitor is selected for use in a DC circuit.
1-1. The capacitance of ceramic capacitors may change
sharply depending on the applied voltage (see
figure).
Please confirm the following in order to secure the
capacitance.
(1) Determine whether the capacitance change
caused by the applied voltage is within the
allowed range.
By using this tool, the preferred products* can be checked
by specifications, such as the power, voltage, and
fundamental frequency of the voltage waveform to be
input into the capacitor.
*Supported Series
Temperature characteristic U2J of GCM/DC250V or more
[DC Voltage Characteristics]
Sample: R Characteristics 0.1μF, Rated Voltage 50VDC
20
0
-20
-40
-60
-80
-100
(2) In the DC voltage characteristics, the rate of
0
10
20 30
DC Voltage (V)
40
50
capacitance change becomes larger as voltage
increases, even if the applied voltage is below
the rated voltage. When a high dielectric constant
type capacitor is used in a circuit that requires a
tight (narrow) capacitance tolerance (e.g., a time
constant circuit), please carefully consider the
voltage characteristics, and confirm the various
characteristics in actual operating conditions in an
actual system.
2. The capacitance values of high dielectric constant type
capacitors changes depending on the AC voltage applied.
Please consider the AC voltage characteristics when
selecting a capacitor to be used in an AC circuit.
[AC Voltage Characteristics]
Sample: X7R Characteristics 10μF, Rated Voltage 6.3VDC
30
20
10
0
-10
-20
-30
-40
-50
-60
0
0.5
1
1.5
2
AC Voltage (Vr.m.s.)
Continued on the following page.
48
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