Evaluating an HDI PCB manufacturer requires evidence for the construction you intend to buy. A capability table can begin the conversation, but isolated minimum dimensions do not prove that the full stackup, via arrangement, material and acceptance plan can be produced together.
Send one controlled comparison package
Provide the same fabrication data, stackup, via schedule, material requirements, quantity breaks and evidence requirements to each candidate. Ask them to identify assumptions and exceptions explicitly. A quote that silently changes the construction is a different technical proposal, even when it uses the same board name.
Separate required evidence from optional preferences. Identify the requirements whose failure would prevent product acceptance, then decide what documentation and verification will demonstrate them. This makes supplier responses easier to compare and helps avoid collecting certificates that do not apply to the actual work.
Evidence-oriented comparison
| Evaluation area | Useful question |
|---|---|
| Construction fit | Can the supplier explain and support the complete interconnect sequence? |
| Process control | Which changes require customer approval and how are they recorded? |
| Acceptance | How do coupons and tests represent the demanding structures in this board? |
| Traceability | Can delivered boards be associated with the agreed material and process records? |
| Commercial scope | Which engineering, test, tooling and shipping costs are excluded? |
Review exceptions before placing the order
An exception may be sensible, such as a different pad geometry that improves process margin. It still needs engineering review. Ask for a marked drawing or data change rather than a vague statement that the supplier will “optimize” the board.
For an illustrative comparison, supplier A may quote the requested stacked structure while supplier B proposes staggered connections. Evaluate whether B's proposal fits the available area and preserves electrical behavior. The decision cannot be made fairly by comparing the two unit prices alone.
Use the first build to evaluate reproducibility
Define what the pilot must demonstrate and who approves release to the next stage. Review deviations, test results and manufacturing feedback against the exact as-built configuration. Keep unresolved issues visible rather than treating a single functional prototype as evidence for every production requirement.
Plan the handoff if a second source will be needed later. Identify which files, stackup details and acceptance records are necessary to compare the new process. The aim is a reproducible purchasing specification with a clear approval owner. This website does not present unverified customer references, factory equipment or certifications as supplier-selection evidence; those company details remain [NEEDS CLIENT INPUT].
Continue the engineering review
- HDI PCB manufacturing requirements
- HDI PCB cost drivers
- HDI microsection and performance testing
- HDI PCB engineering hub
Review your HDI requirements
Share the board revision, proposed stackup, quantity and open questions. Include the requirements discussed in this guide so the project review starts with the same assumptions.