What is Annular Ring in PCB?

What is Annular Ring in PCB?

The annular ring is the width of the copper area around a via to connect it with the PCB trace network. Annular ring size is an important PCB design consideration since, during PCB fabrication, many conditions can cause holes to not be drilled perfectly centred. Therefore, it is necessary to design a sufficiently thick ring to allow for manufacturing tolerances and still produce a reliable electrical connection to the via. See Figure 5 below for an illustration. We at Hopetimepcb can fabricate the board with an annular ring listed in Table 14 below.

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