Non-plated holes are drilled after HASL, silkscreen and soldermask, so backing plates will not prevent tearing.
Registered by
Stephen
Summary ( Please see this post for details https:/
The copper shouldn't touch the edge of the hole in an NPTH pad (otherwise the copper will tear when the board is being drilled).
Drilling of non-plated holes happens very late - the board already has HASL, silkscreen and soldermask applied, it's not
flat, and so backing plates will not prevent tearing of the copper pad.
Hence, it is necessary to have a small unplated ring/annulus immediately surrounding the hole
Blueprint information
- Status:
- Not started
- Approver:
- None
- Priority:
- Undefined
- Drafter:
- Stephen
- Direction:
- Needs approval
- Assignee:
- None
- Definition:
- New
- Series goal:
- None
- Implementation:
-
Unknown
- Milestone target:
- None
- Started by
- Completed by
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