PCB Manufacturing Process: From Gerber to Finished Board

CAM engineering checks that each copper, solder-mask, silkscreen, drill, and outline file has a clear purpose and matches the layer map. The team also reviews the stackup, board dimensions, hole types, surface finish, controlled-impedance requirements, and special notes such as edge plating or via-in-pad. If the drawing and data disagree, the open point should be resolved before tooling.

Send a consistent layer map, NC drill files with plated versus non-plated holes identified, board outline, stackup, and fabrication notes. The Gerber preparation checklist explains how to package these files for review.

For a multilayer rigid board, copper-clad core material is prepared and coated with photoresist. Artwork is aligned and imaged onto the resist; after development, exposed copper is etched away to leave the intended traces, pads, and planes. Optical inspection can compare the patterned layer with its digital data before the layers are stacked.

Copper balance, spacing, and registration affect what can be built reliably. These details should be reviewed against the selected material and approved capability range instead of assuming one line-width limit applies to every layer and copper weight.

The patterned cores are aligned with prepreg and copper foil, then bonded under heat and pressure into a multilayer panel. Registration targets and the stackup determine how the internal layers line up with one another. After lamination, mechanical drills create through-holes; laser drilling may be used for microvias on an HDI design.

A standard through-hole board and an HDI board can differ substantially here. Sequential lamination and microvia formation add cycles, so the layer map and via architecture must make clear which holes connect which layers. See the HDI PCB design guide before specifying blind, buried, or stacked microvias.

For plated through-holes, the drilled panel is prepared so copper can be deposited on the hole walls and connect the copper layers. The outer copper layers are then patterned and etched to create the final surface traces and pads. Depending on the build, inspection may check registration, plated features, and the outer-layer artwork against the manufacturing data.

If the board requires controlled impedance, the actual dielectric construction, copper, trace geometry, and reference planes must match the approved stackup. Specify the controlled structures and coupon requirements in the fabrication package; a nominal “50 ohm” note by itself does not define the complete test plan.

Solder mask is applied and opened where pads must remain exposed. Silkscreen may then identify components or board information. The selected surface finish protects exposed copper and supports the planned assembly process. Board outlines, slots, and scored features are routed or profiled to the approved mechanical drawing.

Electrical testing commonly checks continuity and isolation against the supplied net data. Visual, dimensional, or other inspections depend on the drawing, acceptance class, and purchase requirements. Tell the fabricator what evidence or report you expect rather than assuming every order includes the same test record.

Finish choice is part of the assembly plan: compare storage, pitch, reflow, and cost in the PCB surface finish guide, then identify the selected finish and any approved alternate in the drawing.

HDI can require sequential lamination, laser-drilled microvias, filling, and planarization; the exact sequence follows the approved via structure. Flex circuits use flexible dielectric and coverlay, and rigid-flex builds combine rigid sections with a flex region. RF and other hybrid constructions may use different laminate families within one stackup. These routes should be confirmed against the actual drawing and material plan.

When the construction is specialized, submit the layer map, material requirements, drill/via details, bend or impedance constraints, and expected test evidence together. MOZPCB’s capability table is a starting point; project-specific limits should be confirmed during engineering review.

Include Gerber or accepted manufacturing data, NC drill files, a readable layer map, stackup and finished thickness, copper weights, board dimensions, surface finish, and quantity by revision. Add impedance tables, controlled-depth or via-in-pad notes, outline requirements, acceptance class, test data, target date, and destination when they apply. If a decision is open, list the preferred option and what substitutions require approval.

For a combined bare-board and assembly quote, also provide the BOM, pick-and-place data, assembly drawing, and any test or partial-population plan. Start from PCB fabrication services or send the package through the quote request page.