MIL-PRF-39018/6D
AC verification:
DCL - See table I.
ĆCap. - Within ±15 percent of initial measured value.
ESR - 200 percent of initial requirement.
Reverse voltage aging: In accordance with MIL-PRF-39018.
Marking: In accordance with MIL-PRF-39018.
Part or Identifying Number: M39018/06-(dash number from table I).
APPLICATION NOTES:
1. Ripple current. Capacitors shall withstand the rms ripple currents at 120 Hz as given in table I.
The maximum ripple current shall apply with the following qualifications:
The sum of the dc voltage plus the peak value of ac voltage must not exceed the working voltage rating of the
unit, or the ac shall never exceed the maximum dc.
The values of dc voltage and ac peak voltage must be such that not more than a 1.5 volt voltage reversal is
experienced.
If capacitors are used to filter circuits at a frequency other than 120 Hz, the rated 120 Hz rms ripple current
should be multiplied by the factor given in the following table.
TABLE II. Factors for determining ripple currents at various frequencies.
Frequency (in hertz)
Rated
voltage
50
60
100
120
400
1,000 to 20 kHz
5 - 50
0.85
0.90
0.99
1.0
1.05
1.10
75 - 150
0.80
0.83
0.95
1.0
1.15
1.20
TABLE III. Factors for determining ripple currents at various temperatures.
Temperature (in degrees Celsius)
25°
45°
65°
85°
105°
2.0
1.7
1.4
1.0
0.3
2. Insulation and grounding. These capacitors have an inherently low indeterminate insulation resistance
between the cathode terminal and the container. The container should be considered at the same potential as
the cathode terminal with respect to ground. Where a potential difference exists between the cathode terminal
and the chassis or other metallic mounting surfaces which are usually ground, the capacitors should be
mounted in such a manner as to insulate the container from such mounting surfaces.
3. Shelf life. Shelf life and reforming procedures shall be in accordance with MIL-HDBK-1131.
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