Start an HDI project by proving the dense component breakout. The via structure, build-up layers and assembly pad requirements must work together. Extra process steps should solve a documented routing or performance requirement.
Start with these questions
- Which pad field or channel requires finer interconnects?
- Are via spans and filling requirements defined?
- How will the difficult structures be verified?
Read the engineering guides
Apply a tool or checklist
What to keep in the project record
Approve a demonstrated breakout and a process-specific stack-up. Review cost, repeatability, inspection and assembly surface requirements before freezing the design.