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Query about annular rings

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mayd85

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Hi,

IPC-2221 standard talks about annular rings for plated through holes. It mentions three types, viz.

1) External Supported
2) External Unsupported
3) Internal Supported

I understand that Internal/External means it is on internal/external layer. But what is the difference between supported and unsupported annular rings?
 

FvM

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The terminology is a bit cryptic. IPC-2221A clarifies explicitely that "unsupported holes" means non-plated holes.
 
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    mayd85

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