PCBA DFM Review Checklist (Free, Printable)

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11 critical items still open - these are the highest-risk gaps.

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Board and panel

Board outline, thickness and layer stackup are defined on the fabrication drawingCRITICALPanel or array drawing shows rails, tooling holes and the break method (V score or tab routed)Tab locations keep stress away from ceramic capacitors and BGAsCRITICALBoard edge keep out for components matches the conveyor and depaneling methodBoard bow and twist limits are stated for the finished assemblySurface finish and its standard are specified, for example ENIG or OSPCRITICAL

Fiducials and tooling

Global fiducials are present on each side that carries partsCRITICALLocal fiducials are present for fine pitch parts and large BGAsFiducials have clear copper free area and no solder mask conflictTooling holes are non plated and placed to the machine requirementFiducials are asymmetric enough to avoid loading the panel rotated

Pads, spacing and stencil

Land patterns follow the IPC-7351 style and the manufacturer datasheetCRITICALComponent to component spacing allows placement, inspection and reworkThermal pads on QFN and similar parts have a defined paste aperture patternSolder mask dams exist between fine pitch pads where the fabricator can hold themChip components have symmetrical pads and thermal relief to avoid tombstoningCRITICALVia in pad is filled and capped or tented as requiredStencil thickness and aperture reductions have been reviewed for the finest pitch partCRITICALTall components are not placed next to small fine pitch parts that need printing and rework space

Components and BOM

Every BOM line has a manufacturer and manufacturer part numberCRITICALReference designators in the BOM match the CAD and centroid fileCRITICALPolarity and pin 1 marks are visible on the silkscreen after assemblyMoisture sensitive parts are identified with their MSLEnd of life and long lead time parts are flagged and alternates approvedDo not populate parts are marked consistently in BOM and assembly drawingThrough hole parts have a selective, wave or hand solder method defined

Test and inspection

Test points are accessible for in circuit or flying probe test with sufficient spacingProgramming and debug headers are accessible and describedBGA and other hidden joints have an inspection method agreed (X-ray)IPC class (2 or 3) is stated on the drawingCRITICALConformal coating or potting areas and keep out zones are defined

Documentation and release

Gerber or ODB++ package, drill, BOM, centroid and assembly drawing are all on the same revisionCRITICALSpecial process notes (press fit, underfill, glue) are on the drawingLabeling, serial number and traceability requirements are statedPackaging and ESD requirements are describedOpen DFM questions are logged and signed off before release

Every critical item left open is a likely cause of a delay or yield problem. Resolve all critical items before releasing the design to the EMS or the line.

Link DFM findings to your ERP

We can discuss tying DFM issues to item masters, BOMs and change orders.

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How to use the checklist

Run the review with the layout engineer and a process engineer present. Go through the groups in order, tick items that are confirmed and note actions for anything open. Critical items are those that commonly stop a build or cause yield loss. Export the completed list as evidence with the release package and attach the action log to the engineering change record.

What DFM covers

DFM covers three layers: the board (panel, finish, outline), the assembly (pads, spacing, fiducials, stencil) and the information package (BOM, centroid, drawings). IPC-7351 gives guidance on land patterns, IPC-2221 on generic design, and IPC-A-610 and J-STD-001 define acceptance and soldering requirements for the product class you build.

Early review is far cheaper than a board respin
Ask the assembler for their DFM rules before layout
Use one revision for every file in the package

Worked example

A review finds that a QFN thermal pad has a single large paste aperture. The process engineer proposes a window pane pattern to reduce voiding and floating. The layout engineer updates the stencil file, and the decision is recorded as a closed critical item with the new stencil revision.

Common mistakes

Teams often hold the DFM review after the PCB fabrication order, when changes mean new boards. Another mistake is sending files from different revisions, which causes quantity and designator mismatches. A third is missing manufacturer part numbers, which forces the buyer to guess and risks the wrong part.

Frequently Asked Questions

When should a DFM review be done?

Before PCB fabrication is ordered, ideally at layout review, and again before the first build. Early reviews cost little. Late changes can mean new boards, a new stencil and schedule delays.

Who should attend?

The layout engineer, a manufacturing or process engineer, a test engineer and a buyer. A quality engineer helps with the IPC class and inspection plan.

What are fiducials for?

Fiducials are copper marks that vision systems on the printer and placement machine use to find the true board position. They compensate for panel and board distortion.

Is this checklist enough for IPC class 3?

It is a general review aid. Class 3 products add stricter workmanship, documentation and inspection requirements, so check the customer contract and IPC standards for your specific program.

Netray can help link DFM findings and engineering changes to your ERP item and BOM records so the release is traceable.

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