KLC S2.2

Non-functional variations in part number should be replaced with wildcard

Manufacturer Part Numbers (MPN) often include variations that are non-functional.


  • Temperature rating of the component

  • Packaging information (e.g. reel, tray, tape)

  • RoHS / PbFree information

To capture every possible combination of part variation requires a large number of symbol aliases - this 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).

Rule of thumb

A single symbol should be drawn for each footprint variation of an atomic part. Other variations (as listed above) do not require their own symbol alias.