MIL-PRF-28750F
3.6.11.3 Solder dip (retinning) leads. Only the manufacturer, at their option, may solder dip/retin the leads of the
product supplied to this specification provided the solder dip/retin process (see appendix A, A.3.6.3) has been
approved by the qualifying activity.
3.6.11.4 Package body finish. External metallic package elements other than leads or terminals (such as lids,
covers, bases, or seal rings) shall meet the applicable corrosion resistance and environmental requirements or shall
be finished so that they meet those requirements using finishes conforming to one or more of the following as
applicable pure tin finish shall not be used on any internal or external package surface or as a lead finish. In addition,
tin plating shall not be used as an undercoat:
a.
Solder.
b.
Tin-lead plate.
c.
Gold plate.
d.
Nickel plate.
(NOTE: For further guidance on these package body finishes, see 6.7.3).
3.7 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of (product) and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3
percent lead, by mass (see 6.5).
3.8 Screening. When SSR's (screening level Y only) are screened as specified in 4.7.2.2, they shall meet the
3.8.1 Preseal burn-in (optional). When SSR's are tested as specified in 4.7.2.1, they shall show no evidence of
physical or mechanical damage. In addition, SSR's shall be tested in accordance with the electrical characteristics
(see 3.13) at 25C. Manufacturer may also perform electrical tests at temperature extremes.
3.8.2 Internal visual. When SSR's are tested as specified in 4.7.2.2, they shall meet the requirements as specified.
3.8.3 Temperature cycling. When SSR's are tested as specified in 4.7.2.3, they shall show no evidence of physical
or mechanical damage.
3.8.4 Mechanical shock or constant acceleration. When SSR's are tested as specified in 4.7.2.4, they shall show
no signs of physical or mechanical damage.
3.8.5 Load conditioning. When SSR's are tested as specified in 4.7.2.5, they shall show no signs of physical or
mechanical damage.
3.8.6 Interim (pre-burn-in) electrical requirements (optional). When SSR's are tested as specified in 4.7.2.6, they
shall meet the electrical requirements as applicable.
3.8.7 Burn-in test. When SSR's are tested as specified in 4.7.2.7, they shall show no signs of physical or
mechanical damage.
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