Skip to main content

How to Prevent HDI Fabrication Failures with Proper Via Constraints in Allegro X

Published Date

In this video, we demonstrate how to configure HDI via rules in Allegro X to ensure manufacturability. Key topics include:

  • Defining spacing constraints for microvias vs. through vias
  • Creating region-based constraint areas
  • Configuring annular ring and hole-related checks
  • Managing aspect ratio limits and stacked microvia counts
  • Applying copper spacing rules based on fabrication capabilities

We will also highlight the importance of alignment and density control for stacked microvias and how these checks ensure reliable, manufacturable designs. For engineers working on dense HDI boards (especially those with PCIe, high-speed digital interfaces, or fine-pitch BGAs), proper via constraints are essential. This video shows how to translate fabrication requirements into enforceable rules within Allegro X, verifying manufacturability during layout rather than after.