MIL-PRF-28750F
3.6.7 Temperature. Unless otherwise specified (see 3.1), the SSR shall operate satisfactorily throughout the
temperature range of -55C to +125C, and shall not be damaged when stored at a temperature in the range of
-55C to +125C.
3.6.8 Package. The outline dimensions of the package shall be as specified (see 3.1). In addition, the relay shall
meet the following requirements.
3.6.8.1 Class I. Discrete technology SSR's supplied to this specification shall be sealed in glass, metal, or ceramic
(or combination of these) packages. Adhesive or polymeric material shall not be used for package cover/lid
attachment, seal, or repair. Use of any other package material shall require prior approval from the qualifying
authority.
3.6.8.2 Class II. Hybrid technology SSR's supplied to this specification shall be hermetically sealed in glass, metal,
or ceramic (or combinations of these) packages. No adhesive or polymeric materials shall be used for package lid
attach (or seal) or repair. Flux shall not be used in the final sealing process. The minimum distance between the
glass to metal seals and the package sealing surface for seam welded packages after final seal shall be .040 inch
(1.02 mm) minimum.
3.6.8.3 Internal water vapor content. The internal water vapor content shall not exceed 5,000 parts per million at
+100°C. Polymer impregnation or secondary seal (backfill, coating, or other uses of organic polymeric materials to
effect, improve, or repair the seal) of the SSR package shall not be permitted.
NOTE: Packages containing beryllia shall not be ground, sandblasted, machined, or have other operations
performed on them which will produce beryllia or beryllium dust. Furthermore, beryllium oxide packages
shall not be placed in acids that will produce fumes containing beryllium.
3.6.9 Metals. Metal surfaces shall be corrosion resistant or shall be plated or treated to resist corrosion and shall
meet the requirements specified in 3.6.11.
3.6.10 Other materials. External parts, elements, or coatings including markings shall be non-nutrient to fungus
and shall not blister, crack, outgas, soften, flow, or exhibit defects that adversely affect storage, operation, or
environmental capabilities of SSR's delivered to this specification under the specified test conditions.
3.6.11 Package and lead materials and finishes.
3.6.11.1 Lead or terminal material. A lead or terminal material that enables the relay to meet all of the performance
requirements of this specification shall be used. For further guidance on lead and terminal materials that meet the
performance requirements of this specification, see 6.7.1.
3.6.11.2 Lead finish. The finish system on all external leads or terminals shall conform to one of the following:
a.
Hot solder dip.
b.
Tin-lead plate.
c.
Gold plate.
Pure tin finish shall not be used on any internal or external package surface or as a lead finish. (NOTE: For further
guidance on lead finishes, see 6.7.2).
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business