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https://ohwr.org/work_packages/346
This is outside IPC-A-600H class 3 (which is used in the PCB specification) as it may leave a too small annular ring. According to IPC-A-600H, section 2.10.3 a minimum external annular ring …
https://www.protoexpress.com/pcb/learn-pcb/annular-ring-width/
A small ring would put the via at risk of touching the edge of the pad, which is called tangency, or no longer being encircled by the pad at all. This is called an annular breakout. A class 2 annular ring is at least 1 mil wide. In an IPC Class 3 annular ring, the annular ring …
https://www.tempoautomation.com/blog/the-essentials-of-annular-ring-pcb-design/
Oct 07, 2050 · PCB Annular Ring Design Concerns Cross-sectional and top view of a PCB annular ring . In the figure above, an example of a through-hole via connected to a BGA component pad is shown, which includes both external and internal supported annular rings. As illustrated, several factors affect annular ring PCB design. ...
https://www.4pcb.com/blog/common-printed-circuit-board-design-rule-violations/
Improper Annular Ring An annular ring is the portion of conductive material completely surrounding a hole. A minimum of.005″ annular ring for vias or a minimum of.007″ for component holes is required for manufacturing your printed circuit board design.Author: Armando Fernandez
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