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Improve courtyard on USB_B_OST_USB-B1HSxx_Horizontal

KiCad Bot requested to merge github/fork/joshtyler/usb-b1hsb6 into master

Created by: joshtyler

Improve courtyard on USB_B_OST_USB-B1HSxx_Horizontal.

Datasheet

Original PR is #575 for reference

The existing courtyard is a simple bounding rectangle, but this is overly restrictive when placing components to the north and south of the connector.

KLC F5.3 states:

The component courtyard is defined as the smallest rectangular area that provides a minimum electrical and mechanical clearance around the combined component body and land pattern boundaries. It is allowed to create a contoured courtyard area using a polygon instead of a simple rectangle. (IPC-7351C)

(emphasis mine) I have used an arc to define the keepout around the large pads, I'm not sure if this counts as a polygon for this purpose? I am happy to change to a simple box around these pads if required.

Old: image

New: image

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