mayd85
Junior Member level 3
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?
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?