Microvia cost is a construction question, not simply a price multiplied by a hole count. The arrangement can change routing access, processing sequence, filling requirements and the evidence required for acceptance. Compare alternatives against the same electrical and mechanical requirements before asking which is cheaper.
Identify the feature driving the change
Mark the devices and nets that require microvias. Determine whether one surface-to-inner transition solves the problem or whether the path needs further connections. The cost discussion should begin with that actual requirement, rather than applying a generic HDI premium to every board.
Include pad and clearance envelopes in the routing comparison. A smaller hole may not create another usable channel if the landing pad or plane clearance remains the limiting feature. Conversely, a layout change near one dense device may allow a simpler construction across the board.
Compare the assumptions
| Driver | Question for the quote |
|---|---|
| Layer access | Does the option change the build-up structure or lamination sequence? |
| Fill and surface | Which filling and pad-surface requirements are included? |
| Manufacturing margin | Which geometry is an approved production rule and which is an exception? |
| Acceptance | Are representative coupons, testing and reports included? |
Use a controlled design comparison
For an illustrative fanout, compare an offset microvia route with an aligned route using the same device and endpoints. Record routing area, reference-plane impact and the supplier’s proposed process. Do not select a construction from price alone if the quoted versions differ in geometry or required evidence.
A second comparison might change component placement or board outline enough to avoid a demanding transition. Include enclosure and assembly effects in the result. A board-level saving can disappear if it introduces another expensive product change.
Request an exact commercial response
Send the alternatives as clearly labeled revisions and ask suppliers to itemize recurring price, one-time engineering, tooling, test and delivery assumptions. Keep quantities and acceptance requirements consistent. Record which exclusions explain differences rather than assuming the lowest number represents the same scope.
The site’s calculators use illustrative parameters and cannot quote a validated microvia surcharge. Company-specific prices and geometry limits remain [NEEDS CLIENT INPUT]. Use the whole-board HDI cost guide for the broader comparison, aspect-ratio guide for geometry conventions and stacked versus staggered guide for arrangement tradeoffs.