S2.2 Non-functional variations in part number should be replaced with wildcard
Manufacturer Part Numbers (MPN) often include variations that are non-functional.
Examples of parameters considered non-functional:
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Temperature rating of the component
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Packaging information (e.g. reel, tray, tape)
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RoHS / PbFree information
To capture every possible combination of part variation would require a large number of derived symbols and is to be avoided.
Where an MPN has options for such non-functional variations, these portions of the MPN should be replaced with a wildcard character (x
). If these non-functional parts of the MPN are at the end of the symbol name then the wildcard should be omitted.