MIL-PRF-28861D
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of material is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system command. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting
the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Filters described herein are intended for use in the reduction of broadband radio frequency
interference. Filters covered by this specification are unique due to the necessity to operate satisfactorily in high
reliability military systems under separate or a combination of demanding environmental conditions including high
frequency vibration, high levels of shock, moisture and humidity, and temperature extremes.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification, the applicable specification sheet and the complete PIN (see 3.1).
b. Packaging requirements (see 5.1).
c. Whether copies of x-ray films or real time x-ray digital images and photographs of destructive physical
analysis (DPA) samples are required (class S filters only).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are,
at the time of award of contract, qualified for inclusion in the Qualified Products List (QPL) whether or not such
products have actually been so listed by that date. The attention of the contractors is called to these requirements,
and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government
tested for qualification in order that they may be eligible to be awarded contracts or purchase orders for the products
covered by this specification. Information pertaining to qualification of products may be obtained from DLA Land and
Maritime, ATTN: VQP, P.O. Box 3990, Columbus, OH 43218-3990 or by email at vqp.chief@dla.milail.
6.4 Application data.
6.4.1 Configuration. Best attenuation in the stop-band can be achieved if an inductor faces a low impedance and
if a capacitor faces a high impedance; however, since these are rarely perfectly suited to the application, it may be
necessary to reverse this rule or to sacrifice attenuation in order to eliminate resonance. In cases where the
impedance will vary considerably, filters with one or two additional stages may be used to ensure adequate
attenuation under all possible conditions. The attenuation of filters manufactured with inductors and ceramic
capacitors is affected by temperature, current, and voltage; so, these factors must be considered when the filter is
designed into the system.
6.4.2 Case. Two types of cases are used for filters covered by this specification; hermetically sealed and
non-hermetically sealed. The hermetically sealed filters are enclosed in metallic cases with glass seals, or
equivalent, in order to meet the requirements of the seal test. Non-hermetically sealed filters are enclosed in metallic
cases with potted end seals.
6.4.3 Soldering. When soldering ceramic capacitors and glass seals, heat should be applied in such a way that it
causes an even radial distribution over the surface. Methods such as preheat, slow heating, and limiting the
maximum temperature should be employed to minimize the occurrence of thermally induced cracks, crazing,
chipping, or other physical damage. The same precautions used in heating should be applied in cooling down the
device.
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