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Requirements for component files. See https://nerdocs.atlassian.net/wiki/spaces/NER/pages/118718470/Vault+Guidelines#Symbols.1 and https://nerdocs.atlassian.net/wiki/spaces/NER/pages/118718470/Vault+Guidelines#Footprints.1 for the symbols and footprints you embed!
Types
A few notes on component types and templates
Always use the most specific “Type” that is applicable to your component. More specific types correspond to more specifically tailored templates that include more useful parameters.
In particular:
DO NOT use the “Integrated Circuits” type, unless you truly cannot find a more specific category
Note that within “PMIC” we have created “Voltage Regulators.” This includes LDOs and switching regulators (and any other topologies)
Selection
Manufacturability
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When importing parameters, the above often are suggested. Make sure to uncheck them. |
Symbols
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Footprints
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Symbol Layout
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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 be followed by “?”, as this is the wildcard for auto-generating designators.
Footprints
All layers can adjust line width to be proportional to component size. Around 5 mils / 0.15mm is often a good starting point.
Layer Pair Setup
The following are the required layer pairs names and numbers as well as what to put in each.
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These are all standard types. You can avoid typing them by selecting out of the dropdown first. |
Layer Type | Top / Bottom Layer Numbers | Contents |
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Assembly | 13 / 14 | 3D Model |
Component Outline | 15 / 16 | Outline of physical bounds of package, excluding legs |
Component Center | 17 / 18 | Crosshair at center of component |
Courtyard | 19 / 20 | Clearance required around component / collision box |
Dimensions | 21 / 22 | Additional details component (board edge, insertion direction & clearance, etc) |
Assembly
Should be a 3D model downloaded from the manufacturer or other trusted site
A 3D extrusion is allowable to approximate if no CAD can be found
Additional physical assembly details can be included if required (designator indicators or other features)
Component Outline
Must match the physical outline of the component. This can be traced from 3D body, if the body is accurate. If legs are present, the legs should be disregarded (only trace the plastic/ceramic body)
Component Center
A crosshair must be added to all components. This consists of just two lines intersecting to create plus sign.
Courtyard
Collision box for placing components. This is a boundary that should define how much clearance is recommended between components.
Recommended: 10 mils / 0.25 mm
Pin 1 Designation
Pin one is usually indicated in the datasheet. If not, select the top left or top right corner from the footprint.
Pin one must be indicated in silkscreen. By default, this should be a circle next to pin one.
Pin one ideally is also indicated via pads with a rectangular/square pad (with the other pads being ovular/circular).
3D Model
All footprints must include a 3D model.
If manufacturer CAD is not available, add an extruded model and color it to a representative hue.
Schematics
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Annotations
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