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| Question | Answer |
|---|---|
| What is the reliability of the via-in-pad or microvia-in-pad? | Both via-in-pad and microvia-in-pad structures are highly reliable, provided the PCB fabricator has the expertise to manufacture them correctly and complies with all applicable IPC requirements. Since laser-drilled microvias are more challenging to fabricate, it is recommended to ask your fabricator about their laser drilling process to ensure maximum reliability. |
| Can we use stacked microvias for aerospace? | Yes, stacked microvias meet IPC Class 3 and Class 3A requirements and can be used in aerospace PCBs. However, stacked microvias are subject to internal stress, which can affect their long-term reliability. Therefore, it is important to fully understand the operating environment and the mechanical and thermal stresses the board will experience before choosing this via structure. |