PCB Design Review Checklist: What to Check Before Sending Your Files for Manufacturing
A PCB design might look finished in your CAD tool, but that doesn't always mean it's ready for manufacturing. Before a board goes into fabrication or assembly, every detail needs a final review, from Gerber files and drill data to solder mask settings, silkscreen markings, BOM accuracy, and mechanical specifications.
Even a minor inconsistency can trigger manufacturing queries, delay production, or lead to redesign. In some cases, it results in a complete board respin. That's why experienced teams follow a structured PCB design review process before releasing files for production.
Why a PCB Design Review Matters
Most manufacturing issues don't stem from major design flaws. More often, they come from small oversights that are easy to miss during development.
A drill file might not align with the Gerber data. The board outline could be missing from the mechanical layer. Plated and non-plated holes might not be clearly defined. Solder mask openings may fall outside fabrication limits. Even something as simple as a footprint mismatch between the BOM and PCB layout can create assembly problems.
These mistakes are common, but they're also easy to prevent with a thorough pre-submission review.
Start with the Manufacturing Files
Your manufacturing package is the foundation of a successful build. Before sending files to your PCB manufacturer, confirm that all required outputs are present and exported correctly in your data package (Gerber files).
This typically includes:
- Copper layers
- Solder mask layers
- Silkscreen layers
- Paste layers
- NC drill files
- Board outline or mechanical layer
Take a few minutes to inspect the files in a Gerber viewer. This simple step often reveals missing layers, alignment issues, mirrored text, incorrect scaling, or export errors before they reach the manufacturer.
Catching these issues early saves time for everyone involved.
Read - How to send perfect data package for PCB manufacturing
Review Key Manufacturability Parameters
Once the file package is verified, focus on the design parameters that directly impact fabrication.
Check trace widths and spacing against the capabilities of your selected manufacturer and the copper thickness specified in the design. Review drill sizes, annular rings, and drill-to-pad alignment, especially in dense layouts and multilayer boards.
Pay close attention to copper placement near the board edge. Unless edge plating is intentionally required and clearly documented, copper should maintain adequate clearance from the outline. It's also worth checking for copper slivers, narrow plane gaps, and incomplete polygon pours that may create manufacturing challenges.
Solder mask and silkscreen deserve the same level of attention. Verify mask openings, mask dams, and clearances around exposed copper. For silkscreen, ensure reference designators remain readable and don't overlap pads, vias, or exposed metal surfaces.
Don't Overlook BOM and Footprint Validation
A clean PCB layout doesn't guarantee a smooth assembly process. Component data must be reviewed with equal care.
Every BOM entry should include the correct reference designator, quantity, package type, manufacturer part number, and component description. The package specified in the BOM must match the footprint used on the PCB.
For example, an 0402 resistor listed in the BOM should not be assigned to a 0603 footprint in the layout.
It's also important to verify polarity indicators, pin-1 markings, thermal pads on QFN packages, BGA footprints, and other fine-pitch components. These checks take only a few minutes but help prevent assembly errors that are far more expensive to fix later.
Perform a Final Submission Review
Before packaging and uploading your design files, perform one final review of the complete release package.
Confirm that all required documents are included:
- Gerber files
- Drill files
- Mechanical drawings
- PCB stack-up information
- Bill of Materials (BOM)
- Pick-and-place files
- Assembly notes and special instructions
If the design includes special requirements such as carbon printing, peel-off mask, via filling, countersunk holes, controlled impedance, or panelization instructions, make sure those details are clearly documented in the mechanical drawing or accompanying readme file.
The clearer your submission package, the faster your manufacturing partner can move the project forward.
Read - Which files are necessary for PCB manufacturing and PCB assembly
Download the PCB Design Review Checklist
To simplify the review process, PCB Power has created a downloadable PCB Design Review Checklist for PCB designers, hardware engineers, OEMs, and product development teams.
Use it before every fabrication or assembly release to verify technical capabilities, manufacturing files, design rules, BOM details, and submission requirements.
Download the PCB Design Review Checklist or get an Instant PCB Quote today and move your design to production with confidence.
Frequently asked questions
Q1 - My EDA tool's DRC passed with zero errors. Do I still need to run through a pre-submission checklist?
Yes — and this is the most common misconception. DRC checks your design against your own rule set, which is usually a subset of what the manufacturer actually needs. It won't check file format, layer naming, Gerber viewer accuracy, drill file consistency, BOM field completeness, or whether your mask dam meets a PCB manufacturer's specific registration tolerances. A clean DRC is a good start, not a finish line.
Q2. What is the most common reason PCB Power puts an order on hold before production?
Data package issues — not design errors. The most frequent are: Gerber and drill files using different units or offsets, PTH and NPTH holes not separated in the drill file, solder mask dams below the minimum threshold, and BOM submissions with missing MPNs or EOL parts. Most of these take under ten minutes to fix, but they cost days when caught after submission.
Q3. Do these checks apply if I'm only ordering bare PCBs and not assembly?
Most of them do. Sections covering Gerber output, drill layer, copper rules, solder mask, mechanical layer, and the final sign-off are relevant for every bare board order. Sections covering BOM, component footprints, pick-and-place files, and SMT-specific DFM checks are specific to assembly orders. The checklist is structured so you can skip sections that don't apply to your order type.
Q4. How is PCB Power's checklist different from a generic DFM checklist I can find online?
Generic checklists give you industry rules of thumb — minimums that vary by manufacturer, process, and capability tier. This checklist is built around PCB Power's actual production parameters: the specific values the factory uses for mask openings, dam widths, drill step increments, thermal relief settings, carbon layer specs, and more. Using generic numbers with a specific manufacturer is how you end up with a design that passes one factory's rules and fails another's.
Q5. I've been manufacturing PCBs for years. Is there anything in this checklist I probably haven't seen before?
Possibly. The sections most experienced designers overlook are special process layers — carbon contacts, peel-off mask, and via fill each have their own Gerber requirements and dimensional rules that aren't covered in standard PCB courses or textbooks. The testability section (DFT) and the final 14-point sign-off gate also surface checks that even senior designers tend to skip under deadline pressure. Worth a run-through at least once.
