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Symbol Layout
Symbols should use imperial spacing at 100 mils.
If a more detailed symbol isn’t available, footprints should be implemented using the Altium default yellow rectangle with “small” red outline.
Pins
Pins should be spaced by one 100 mil grid spacing.
Pin designators should be hidden and pin names should exactly match the datasheet (with the exception of characters that Altium doesn’t allow).
Pin arrangement can be either matching the physical layout or optimized for schematic routing (place pins as needed to avoid messy wires).
All pins must be passive type.
Designators
Utilize common designators for symbols. The hard-set definition we use is Appendix F of IEEE-315:
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The right side column is what we utilize, when applicable.
All designator letters should must be followed by “?”, as this is the wildcard for auto-generating designators. For example “D?” for diodes, “J?” for connectors, “R?” for resistors.
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