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MIL-PRF-28861 Filters And Capacitors, Radio Frequency/Electromagnetic Interference Suppression, General Specification ForThis specification covers the general requirements for low-pass filter and capacitors used to suppress radio frequency/electromagnetic interference. Filters furnished to the requirements of this specification contain shunting ceramic discoidal capacitors and series inductors \(FSC 5915\). Capacitors furnished to the requirements of this specification contain shunting ceramic discoidal capacitors \(FSC 5910\). For the purposes of this specification, feed-through capacitor types \(C circuit configuration\) are referred to herein as a filter. Passband power may be alternating current \(ac\) or direct current \(dc\) and the filters used primarily in the reduction of broadband radio frequency interference. This specification provides for two levels of product assurance requirements. Filters covered by this specification are capable of operation over the temperature range of -55 degrees C to +125 degrees C.

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MIL-PRF-28861D
TABLE VI. Group A inspection.
Inspection
Class
Requirement
Test method
Sampling
paragraph
paragraph
procedure
B
S
Subgroup 1
Thermal shock and voltage
conditioning
X
X
Dielectric withstanding voltage
X
X
Insulation resistance (at +25°C)
X
X
100%
Capacitance to ground and
inspection
dissipation factor
X
X
Insertion loss (at +25°C)
X
X
DC resistance 1/ 2/
X
X
DC voltage drop 1/ 2/
X
X
Radiographic inspection
X
X
Seal (when applicable)
X
X
Subgroup 2
Visual and mechanical inspection
X
X
Table VII
Subgroup 3
Solderability
X
X
1/ DC resistance measurement not applicable to specification sheets MIL-PRF-28861/1 through
MIL-PRF-28861/5. DC voltage drop shall be measured for specification sheets MIL-PRF-28861/1
through MIL-PRF-28861/5 parts on a 100 percent basis.
2/ Either dc voltage drop or dc resistance shall be measured for specification sheets MIL-PRF-28861/6 and
MIL-PRF-28861/12 parts on a sample basis using table VII.
TABLE VII. Sampling plan.
Lot size
Sample size
2 to 13
100%
14 to 50
13
51 to 90
13
91 to 150
13
151 to 280
20
281 to 500
29
501 to 1200
34
1201 to 3200
42
3201 to 10000
50
4.5.6 Group B inspection. Group B inspection shall consist of the inspections specified in table VIII in the order
shown. For class B filters, the group B inspection shall be made on sample units selected at random from inspection
lots which have passed group A inspection. For class S filters, the group B inspection shall be performed on sample
units selected at random from the inspection lot that has passed group A inspection.
4.5.6.1 Sampling plan.
4.5.6.1.1 Class B filters.
4.5.6.1.1.1 Quarterly. Every quarter, 25 sample units of each style shall be subjected to the tests of group I.
Twenty samples shall be representative of production in the period. The remaining five samples shall be that PIN
highest on the qualification hierarchy which was produced during the period.
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