MIL-C-39018/10B
Reverse voltage aging: In accordance with MIL-PRF-39018.
Marking: In accordance with MIL-PRF-39018.
Part or Identifying Number (PIN): M39018/10: (dash number from table I).
APPLICATION NOTES:
1. Ripple current. Capacitors shall withstand the rms ripple currents at 20 kHz 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.
Under no conditions of temperature or frequency, regardless of the multipliers given below, should the rms ripple
current be in excess of 30 amperes on terminal "A" capacitors, or in excess of 50 amperes on terminal "B"
capacitors.
TABLE II. Factors for determining ripple currents at various temperatures.
Temperature (in degrees Celsius)
≤45°
65°
85°
105°
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 should be in accordance with MIL-HDBK-1131.
It is recommended that capacitors stored more than 3 years be checked at room temperature for leakage current
in accordance with the applicable requirement before use.
4. Torque. The minimum and maximum torque applied to the steel screw /aluminum insert shall be as follows:
Min
Max
With a minimum of 3 engaged threads - - - - - - - - - - - - - - - - - - -
12 inch/lbs
18 inch/lbs
With a minimum of 6 engaged threads - - - - - - - - - - - - - - - - - - -
20 inch/lbs
25 inch/lbs
Referenced documents. In addition to MIL-PRF-39018, this document references the following:
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