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Via Formation Methods: Mechanical, Laser and Filled Vias

Vias connect layers. How they are formed—mechanical drilling, laser microvias, and whether they are filled or capped—drives both density and reliability.

Overview

This guide explains the role of via formation methods in PCB manufacturing, the equipment involved, and how to specify it correctly. Through-holes are mechanically drilled; blind and buried microvias are laser-formed for HDI. Via-in-pad designs require filling and planarization. Desmear and hole-wall preparation precede plating in every case.

Where It Fits in the Process

Via formation bridges lamination and plating and constrains the achievable routing density.

Equipment Categories Involved

Key Considerations

Aspect ratio limits plating throwing power; stacked and staggered microvias differ in reliability.

Standards and Compliance

Designs and processes in this area commonly reference:

  • IPC-4761 (via protection)
  • IPC-6016
  • IPC-A-600

Selection and Comparison

Key trade-offs when specifying for via formation methods:

  • Through-hole vs. microvia
  • Filled vs. unfilled vias
  • Stacked vs. staggered microvias

Recommended Equipment from acfindustry.com

The following machines from our catalog support the processes discussed above:

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Frequently Asked Questions

What is Via Formation Methods?

Through-holes are mechanically drilled; blind and buried microvias are laser-formed for HDI. Via-in-pad designs require filling and planarization. Desmear and hole-wall preparation precede plating in every case.

What should I consider for via formation methods?

Aspect ratio limits plating throwing power; stacked and staggered microvias differ in reliability.

What equipment is used for via formation methods?

It involves Drilling and Via Formation Equipment and Plating and Metallization Equipment. You can browse each category and request a matched configuration through the equipment finder.

Where does via formation methods fit in the PCB process?

Via formation bridges lamination and plating and constrains the achievable routing density.

Which standards apply to via formation methods?

Relevant standards include IPC-4761 (via protection), IPC-6016, and IPC-A-600.

How do I get a quotation for via formation methods equipment?

Use the equipment finder on this page to specify your process stage, board type, automation level and production volume, then submit the inquiry. An engineer from acfindustry.com will respond within one business day.