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Symbols shall only be created when no suitable models already exist. This will be the case most often for ICs.
Designators
Keep designators to commonly used values. A list can be found at https://en.wikipedia.org/wiki/Reference_designator#Designators. If there is already similar component, use the same designator!
Pin Arrangement
Pins should be arranged to prioritize schematic readability over being representative of their physical location. The “typical application” section of a data sheet usually has a good arrangement of pins that lead to readable schematics.
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