Distinguish the board from the assembly panel
Provide both the individual board outline and the proposed panel drawing, clearly identifying which file governs fabrication. Show board count, orientation, separation features and any process rails. If panel design is requested as part of the project, state the constraints rather than supplying an unreviewed array as a mandatory solution.
A panel that uses material efficiently can still be inconvenient to handle or separate after population. Tall connectors, overhanging parts and delicate components near edges may change the acceptable arrangement. Engineering review should balance fabrication, assembly and final separation needs instead of optimizing one stage while leaving the others to adapt.
- 01Design files
- 02Engineering review
- 03Fabrication
- 04Inspection
- 05Delivery
Reserve handling and alignment features intentionally
Identify process rails, fiducials and tooling holes in the panel drawing. Their sizes and locations need confirmation against the planned equipment and process. Do not copy a generic rail width and assume it is accepted everywhere. Keep customer product features distinguishable from temporary manufacturing features.
Show where components or solderable features extend into the areas used for handling. If a connector overhangs the board edge, include its installed geometry, not only its courtyard. The table summarizes the decisions to close. Required dimensions and clearances are project-specific review items, not capability values implied by this educational page.
| Panel feature | Information to supply | Review dependency |
|---|---|---|
| Array | Rows, columns, board count and rotation | Placement and test mapping |
| Rails | Location and proposed dimensions | Handling and component clearance |
| Fiducials | Locations and intended use | Alignment and optical access |
| Tooling features | Hole or fixture references | Mechanical location |
| Separation | Method, tabs or scoring proposal | Tool access and finished edge |
| Identification | Panel and position marking | Unit status after separation |
Keep panel data and placement data synchronized
When multiple boards share a panel, clarify whether coordinates describe one board or the full panel. State the origin, units, board side and orientation convention. Include the array transformation if the assembly setup needs it, and make sure that mirrored or rotated instances are intentional.
Any panel change can affect paste tooling, fiducial positions, inspection programming and separation instructions. Regenerate or review the linked outputs after approval rather than editing one drawing in isolation. A release manifest should name the individual PCB revision and the assembly panel revision separately so a repeat order can reproduce the same relationship.
Review separation around populated components
Choose a proposed separation method with attention to board outline, nearby copper, mounted parts and the acceptable finished edge. Tabs, routed spaces and scoring each introduce their own geometric and handling considerations. Identify edge connectors, brittle components and parts that could obstruct a tool path or experience unwanted loading during separation.
Specify which features must remain intact and where residual tab material is acceptable. If the assembled board fits closely inside an enclosure, include the relevant edge tolerance and clearance. Depanelization should be a planned operation with an acceptance condition, not an undocumented final step performed after all other work is complete.
Plan identification and test while boards are still joined
Decide whether test and programming occur on the panel or on separated boards. A panel-level fixture requires access and mapping for each position, while separated testing needs a way to preserve the unit’s identity. Mark array positions if that information is useful for tracking inspection findings or investigating a repeated location issue.
Define how rejected positions are handled. A panel can contain an incomplete or held unit alongside acceptable units, so the status must remain visible through separation and packing. Avoid treating a panel-level pass label as proof that every individual board received the same checks unless the record actually supports that conclusion.
Approve the panel before committing linked tooling
Request a review drawing that makes dimensions, array count, orientation, rails, fiducials, tooling features and separation details readable. Cross-check it with the populated-board view and assembly sequence. Record approval before releasing associated board fabrication and stencil preparation, and retain the approved drawing for repeat builds.
Use fabrication panelization for the broader panel discussion, stencil planning for paste-tool coordination and assembly scope for process sequencing. Submit your proposed assembly panel with component overhangs and separation constraints. Actual dimensions and process compatibility require engineering confirmation.
Assembly Panel Requirements checklist
Use this checklist to prepare your inquiry. These selections stay in this browser and do not submit a project.
Frequently asked questions
Can the fabricator create the assembly panel?
That can be requested, but assembly requirements must be supplied and reviewed. A fabrication-efficient array is not automatically suitable for the populated-board process.
Are process rails always required?
Requirements depend on board geometry and the planned handling method. Submit the board and component layout so engineering can confirm the appropriate panel features.
Should placement coordinates describe one board or the panel?
Either convention must be explicitly identified and agreed. The origin, units, transformations and relationship to the approved panel need to be unambiguous.
Can components overhang the panel's board outlines?
Show their installed geometry and review clearance, tool access and separation. Overhangs can restrict arrangement even when the bare boards fit the array.
Why does a panel change require stencil review?
The stencil must align with the intended board images and reference features. Changing the array or alignment geometry can invalidate existing paste-tool correspondence.