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Via Annular Ring Formula:
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The annular ring refers to the copper area surrounding a drilled hole in a printed circuit board (PCB). It ensures proper electrical connection between the via and the connected trace or pad, providing mechanical stability and electrical continuity.
The calculator uses the annular ring formula:
Where:
Explanation: The annular ring width is calculated as half the difference between the pad diameter and the hole diameter, ensuring sufficient copper area around the via for reliable connections.
Details: Proper annular ring width is crucial for PCB manufacturing quality. It affects the reliability of electrical connections, prevents drill breakout, and ensures the structural integrity of vias during the assembly process.
Tips: Enter pad diameter and hole diameter in consistent units. Both values must be positive numbers, and pad diameter must be larger than hole diameter for valid calculation.
Q1: What is the minimum recommended annular ring width?
A: Typically 0.15mm (6 mil) for standard PCBs, but this may vary based on manufacturer capabilities and design requirements.
Q2: What happens if the annular ring is too small?
A: Insufficient annular ring can lead to drill breakout, poor electrical connections, and reduced mechanical strength of the via.
Q3: Can annular ring requirements vary for different PCB layers?
A: Yes, inner layers may have different requirements than outer layers due to manufacturing processes and material constraints.
Q4: How does annular ring affect high-frequency designs?
A: Proper annular ring design is critical for impedance control and signal integrity in high-frequency applications.
Q5: Are there industry standards for annular ring dimensions?
A: Yes, standards like IPC-6012 provide guidelines for annular ring requirements based on product classification and reliability needs.