Page 55 - 2019 Mil/Aero eBook
P. 55

for instance, include the use of cadmium or zinc to achieve an electrically conductive finish, and contact finish specifications may define the required thickness of gold, which is the standard finish, or mandate the use of another material.
 Positronic HDC Series standard-density D-Sub connectors for mil/aero applications are rated for operating temperatures extending from -55°C to 125°C, are qualified to UL #E49351 and CSA #LR54219, have a UL94 V-0 flammability rating, and are available RoHS 5/6 compliant. They are also available in five layouts with steel or stainless steel shells, DAP insulators, and 9–50 fixed, machined, size 20 gold-plated copper alloy contacts.
Military standards are rigorous, but do include many options for manufacturers to build a variety of products that meet the specifications. The 40-page MIL-DTL-24308 standard document goes into detail about contact sizes and types, mating forces, voltage requirements, and environmental specifications, such as temperature, humidity, and salt spray. It also requires manufacturers to comply with the verification process and to prove that their products meet every requirement. In order to maintain qualification, manufacturers must provide a report that summarizes their testing results every 24 months and submit requalification requests every 36 months. Periodic inspections can and do happen as well, which helps to further maintain the integrity of these specifications.
Aerospace Specifications
Space connectors must deliver efficient, high-quality performance as well, but have their own set of standards that, although similar to military standards, differentiate in some areas. Connectors that operate in space applications must be capable of standing up to extreme environmental conditions and must also be long lasting since repair is typically impossible once they have left the Earth’s surface. To qualify for design-in on spacecraft or satellites, connectors must be tested and approved by agencies such as the National Aeronautics and Space Administration (NASA), the European Space Agency (ESA), the Japan Aerospace Exploration Agency (JAXA), or whichever space agency governs the equipment the connectors will be employed in.
  Positronic SDD Series high-density D-Sub connectors for spaceflight applications feature gold-finish brass shells with six layouts, polyester insulators, and 15–104 machined, size 22 copper alloy contacts plated with a minimum of 50μin gold. The series also offers wire, right-angle solder, and straight solder terminations and meets ASTM E-595 and NASA-RP-1124 requirements.

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