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MICROREL HI-REL PARTS GUIDES BOOKLETS

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NASA & ESA Specification Systems for High Reliability E.E.E. Parts

A specification document is often referenced by a contract or procurement document. It provides the necessary details about the specific requirements. Specifications may be written by government agencies, standards organizations and others (i.e. end-user normally referred as “Custom spec”)

The U.S. National Aeronautics and Space Administration (NASA) adopt MIL-STD-975 as Standards Electrical, Electronic and Electromechanical (EEE) Parts List, consisting of selected standard Military specification Part Numbers and are divided into two Quality level classifications, Grade 1 & Grade 2 components which vary enormously between commodities and between individual specifications.

The European Space Agency (ESA) uses its own specifications for electronic parts based on ECSS-Q-ST-60C standard for requirements for selection, control, procurement and usage of EEE components for space projects. This standard differentiates between three (3) classes of components through three different sets of standardization requirements (clauses) to be met.

These two specification systems have the same goal, to provide a set of documents for part procurement which contain performance and testing requirements designed to provide reliable components.