Find the requirement driving each premium

Ask which design choices move the proposal beyond a simpler manufacturing route. A single difficult via combination may be more consequential than a larger area of ordinary routing. A special material might be necessary for one electrical path, or might remain from an earlier design that no longer needs it.

Label each demanding feature with its functional reason. This allows the design team to challenge unnecessary complexity while preserving the constraints that protect electrical behavior, assembly, or product life.

Compare alternatives with the same objective

Consider an illustrative compact module with two options: a smaller board with an additional build-up level, or a modestly larger board using fewer complex transitions. Compare their panel utilization, assembly fit, qualification needs, and repeat-order assumptions. Do not assume that either the smaller board or the lower layer count wins.

Keep acceptance requirements identical during the comparison. Removing test coverage or changing materials may lower a quotation, but it also changes what is being purchased and must be evaluated explicitly.

Separate recurring and one-time work

Tooling, engineering review, fixtures, and qualification can have a different cost pattern from repeat fabrication. Ask for an itemized explanation appropriate to the order. Avoid spreading an early engineering charge across a guessed production quantity and presenting the result as a reliable unit price.

  • Supply quantity scenarios with the same drawing revision.
  • Identify approved material alternatives and substitution limits.
  • Compare identical delivery and inspection requirements.
  • Clarify whether a quote includes the necessary reports and tooling.

Use the next layout change wisely

Cadence's stackup discussion connects HDI architecture with build-up choices. A useful cost review translates that architecture into actual routes: which nets force the extra access, and could placement or assignment changes remove that need? Resolve this before detailed routing makes every construction change expensive in engineering time.

DESIGN NOTE / SCHEMATIC

Adjacent-layer access, one connection at a time

Signal copper

Dielectric · geometry + material

Reference copper

Core or build-up dielectric

Signal copper

Illustrative only. Copper thickness, dielectric construction and via spans require a reviewed stackup.

Common questions

Can a calculator predict an HDI purchase price?

It can help compare complexity assumptions, but a price requires a reviewed design, quantity, supplier process, and commercial terms.

Should I loosen every tolerance to reduce cost?

Only loosen requirements that the product can tolerate. Target unnecessary restrictions after identifying their electrical, assembly, and reliability purpose.

References & further reading

Method & assumptions · General design guidance. Validate the proposed construction and acceptance criteria for your project.