MIL-PRF-28750F
2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited
herein (except for related specification sheets), the text of this document takes precedence, unless otherwise noted.
Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of conflict between requirements of this specification and the specification
sheet, the latter shall govern.
3.2 Qualification. SSR's furnished under this specification shall be products which are authorized by the qualifying
activity for listing on the applicable Qualified Products List (QPL) at the time of award of contract (see 4.4 and 6.3).
3.3 Quality system. The manufacturer shall establish and maintain a QPL system for parts covered by this
specification. Requirements for this system are specified in MIL-STD-790. For class II SSR's, the manufacturer's
QPL system shall also address the requirements of appendix A and the qualifying activity for this specification may
use pre-existing certification of the manufacturing facility in accordance with MIL-PRF-38534 as an alternative. The
manufacture shall also establish a component evaluations system as part of the MIL-STD-790 overall system in
accordance with appendix B.
3.3.1 Statistical process control (SPC). As part of the overall MIL-STD-790 QPL system, the manufacturer shall
establish an SPC system that meets the requirements of EIA-557.
3.3.2 Electrostatic discharge (ESD) control program. As part of the overall MIL-STD-790 QPL system, the
manufacturer shall establish and maintain an ESD control system. As a minimum, this plan must address the
identification of ESD sensitive (ESDS) sub-components and end items, facilities, training, design protection, handling
procedures, marking, cleaning, preservation, packaging, and verification.
3.4 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material
shall be used which will enable the SSR's to meet the performance requirements of this specification. Materials used
shall be self-extinguishing; and shall not support combustion, give off noxious gases in harmful quantities, give off
gases in quantities sufficient to cause explosion of sealed enclosures, cause contamination to any part of the SSR, or
form current carrying tracks when subjected to any of the tests specified herein. The selection of materials shall be
such as to provide maximum shelf life. After qualification, any change of parts or material shall be submitted to the
Government qualifying activity for approval. Acceptance or approval of any constituent material shall not be
construed as a guaranty of the acceptance of the finished product.
3.4.1 Metals and plating. Metals shall be of a corrosion-resistant type or shall be plated or treated to resist
corrosion. Use of pure tin, plating or otherwise, is prohibited internally and externally (see 6.7.2b). Use of tin-lead
finishes are acceptable provided that the minimum lead content is 3 percent.
3.5 Circuit element requirements for class II SSR's. The requirements for circuit elements shall be in accordance
with appendix B.
3.6 Interface and physical dimensions. SSR's shall meet the interface and physical dimensions specified (see 3.1).
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