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A quick reference for via protection structures. Images are placeholders—replace with your uploaded assets.
| Via Type | Definition | Image |
|---|---|---|
| Tented Via (Type I Via) |
A via with a dry film mask material applied bridging over the via wherein no additional materials are in the hole. Single Sided Tented Not Recommended.
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| Tented and Covered Via (Type II Via) |
A Type I via with a secondary covering of mask material applied over the tented via. Single Sided Tented and Covered Not Recommended. |
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| Plugged Via (Type III Via) |
A via with material applied allowing partial penetration into the via. Single Sided Plugged Not Recommended.
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| Plugged and Covered Via (Type IV Via) |
A Type III via with a secondary covering of material applied over the via. Single Sided Plugged and Covered Not Recommended.
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| Filled Via (Type V Via) |
A via with material applied into the via targeting a full penetration and encapsulation of the hole.
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| Filled and Covered Via (Type VI Via) |
A Type V via with a secondary covering of material (liquid or dry film soldermask) applied over the via.
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| Filled and Capped Via (Type VII Via) |
A Type V via with a secondary metallized coating covering the via. The metallization is on both sides.
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Note: Single-sided tented/plugged variants are generally not recommended for reliability.
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