About Annular Ring Calculator (Formula)
An Annular Ring Calculator is a specialized tool used in electronics and printed circuit board (PCB) design to determine the width of the copper ring surrounding a plated through-hole. This ring is crucial for ensuring a secure electrical connection and structural integrity in the PCB. The formula for calculating the annular ring width is as follows:
Annular Ring Width = (Diameter of the PTH – Diameter of the Component Lead) / 2
Where:
- Annular Ring Width is the width of the copper ring around the plated through-hole (PTH), typically measured in millimeters (mm) or mils.
- Diameter of the PTH is the diameter of the plated through-hole, usually specified in millimeters (mm) or mils.
- Diameter of the Component Lead is the diameter of the lead or pin of the electronic component that will pass through the hole, also specified in millimeters (mm) or mils.
This calculator is essential for PCB designers and manufacturers to ensure that the annular ring width meets the design requirements and provides reliable electrical connections while avoiding potential short circuits or structural issues in the PCB.