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  1. #1
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    Query about annular rings

    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?

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  2. #2
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    Re: Query about annular rings

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


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