# PCB Design Documentation: What Every Manufacturing Package Should Include Learn what PCB design documentation should include, from Gerbers and BOMs to assembly drawings and complete manufacturing release packages. Written by [Gabriel Hacohen](#) Published Jun 2026 - 7 min read [![PCB design documentation checklist showing essential manufacturing package files including Gerbers, BOMs, and assembly drawings](https://www.flux.ai/p/assets/blogs/pcb-design-documentation/main.webp)](#) PCB design documentation is the collection of files, drawings, and instructions required to [manufacture](https://docs.flux.ai/Introduction/getting-started-in-flux--export-and-manufacturing) and assemble a circuit board. A complete package includes [Gerbers](https://docs.flux.ai/reference/gerber-export), drill files, assembly drawings, BOMs, fabrication notes, test instructions, and revision information. Completing the [routing](https://docs.flux.ai/tutorials/routing-tutorial) of a complex printed circuit board is a major milestone, but the project is far from over. The transition from a digital CAD file to a physical, functioning piece of hardware relies entirely on how well you communicate your design intent to the manufacturer. Creating accurate, comprehensive **PCB documentation** is the critical final bridge between the engineering team and the factory floor. Without it, you risk misaligned components, incorrect materials, and costly production delays. This guide breaks down exactly what files you need to include in your manufacturing handoff to ensure a flawless production run. ## Key Takeaways - [Documentation is your contract with the manufacturer](#why-documentation-matters-in-pcb-manufacturing) -- it defines exactly what is being built, specifying materials, tolerances, and assembly steps. - [A complete package prevents delays](#the-complete-pcb-manufacturing-package) -- supplying a unified set of Gerber files, drill data, and a clean BOM prevents "engineering holds" at the fab house. - [Clarity prevents errors](#pcb-documentation-best-practices) -- clear fabrication drawings PCB manufacturers can easily read will eliminate guesswork regarding stackups and impedance requirements. - [Modern tools eliminate sync issues](#how-modern-pcb-tools-simplify-documentation) -- using a single-source-of-truth platform prevents the common mistake of sending an updated layout with an outdated BOM. ## What Is PCB Documentation? **PCB documentation** is the standardized set of digital files, text notes, and visual drawings that act as the master blueprint for your circuit board. Modern circuit boards are built in two distinct phases: 1. **Fabrication:** Making the bare board. 2. **Assembly:** Soldering the components. **PCB documentation** must cater to both processes. It translates the abstract layers and components on your screen into physical machine instructions and human-readable guidelines. If a detail is not explicitly stated in your **design release package**, the manufacturer will either pause production to ask for clarification, or worse, guess the answer based on standard defaults, which may ruin your board. ## Why Documentation Matters in PCB Manufacturing Manufacturing failures often stem from incomplete or inconsistent documentation rather than poor routing. - **Avoids Engineering Holds:** If your drill files don't align with your copper layers, the manufacturer halts production. Precise documentation keeps your project on schedule. - **Ensures Quality and Reliability:** Providing strict fabrication notes regarding dielectric materials and impedance control ensures your high-speed signals perform exactly as simulated. - **Creates a Single Source of Truth:** A well-documented **manufacturing package for PCBs** ensures that the procurement team ordering parts, the fab house making the board, and the assembly line placing the chips are all working from the exact same revision. ## The Complete PCB Manufacturing Package A standard **manufacturing package PCB** export must contain specific files for fabrication and assembly. Below is a checklist of the essential files every release should include. | File Type | Description | Primary Purpose | | --- | --- | --- | | **Gerber Files** | 2D vector image files (usually RS-274X or X2 format) representing each physical layer of the board. | Instructs the manufacturer's photolithography machines where to etch copper, apply solder mask, and print silkscreen. | | **Drill Files** | Also known as NC Drill or Excellon files. Text files containing the X-Y coordinates and tool sizes for every hole. | Tells the CNC drilling machines exactly where to drill plated and non-plated through-holes and vias. | | **Bill of Materials (BOM)** | A spreadsheet listing every component on the board, including reference designators, values, and manufacturer part numbers. | Used by procurement to buy parts and by the assembly house to know what goes on the board. | | **Pick and Place Files** | A text file (Centroid or XY data) containing the X-Y coordinates, layer, and rotation for every surface-mount component. | Programs the robotic pick-and-place machines for automated assembly. | | **Assembly Drawings** | Visual assembly documentation PCB technicians use, showing component outlines, reference designators, and pin 1 orientations. | Guides manual assembly steps, visual inspection, and quality assurance. | | **Fabrication Notes** | A text document or drawing layer detailing stackup, material requirements (e.g., FR4 Tg 170), copper weight, surface finish (e.g., ENIG), and impedance constraints. | Sets the physical and chemical manufacturing rules for the bare board. | | **Test Instructions** | Guidelines, test point locations, and expected voltage ranges for post-assembly validation. | Used by QA teams to perform flying probe or in-circuit testing (ICT). | ## PCB Documentation Best Practices To ensure a smooth handoff, engineers should adhere to several best practices when generating a fabrication package: - **Implement Strict Version Control:** Always include the revision number directly on the copper or silkscreen layers, and ensure that number matches the filenames in your export. If you update the layout, you must generate a completely new package. *(Learn more in our [PCB version control guide](https://docs.flux.ai/tutorials/version-control---deep-dive).)* - **Detail the Stackup:** Your fabrication drawings PCB export should visually depict the layer stackup, detailing core thickness, prepreg types, and copper weights. - **Include a ReadMe File:** It's best to include a simple text file at the root of your ZIP folder explaining exactly what the package contains, the contact information for the lead engineer, and any critical, non-standard manufacturing requirements. ## Common Documentation Mistakes - **Outdated BOMs:** The most frequent error is swapping a component during a late-stage layout review but forgetting to update the exported spreadsheet. This results in the assembly house trying to place a 0805 component onto a 0402 pad. - **Missing Solder Paste Layers:** Forgetting to generate the top and bottom paste layers prevents the manufacturer from creating the stencils needed for component assembly. - **Ambiguous Fabrication Notes:** Failing to specify a surface finish (like HASL vs. ENIG) or board color will result in the factory using their default options, which may not be suitable for your application. ## How Modern PCB Tools Simplify Documentation In traditional desktop EDA workflows, creating a **design release package** is a manual, highly fragmented process. Engineers must remember to click a dozen different export buttons, ZIP the files, and email them to the manufacturer. If a late-stage change occurs, this entire process must be repeated, creating a high risk of version mismatch. Instead, modern, cloud-native platforms like Flux fundamentally simplify such a process by providing a single source of truth. Because the **PCB documentation**, layout, and BOM all live in the same unified cloud environment, they are inherently synchronized. When a component changes in the layout, the BOM updates in real-time. When you are ready for manufacturing, Flux streamlines the export process, allowing you to generate comprehensive **assembly drawings**, Gerbers, and pick-and-place files with a single click. Furthermore, you can simply share a secure, view-only link with your manufacturer to conduct collaborative PCB design reviews directly in the browser, ensuring everyone is aligned before a single file is ever downloaded. ## FAQs ### What files do PCB manufacturers need? At a bare minimum, a fabricator needs Gerber files (for copper, solder mask, and silkscreen layers), NC Drill files (for holes and vias), and a text file containing fabrication notes (materials, thickness, surface finish). ### What is included in a PCB manufacturing package? A complete package includes fabrication files (Gerbers, drill files, fab notes) to make the bare board, and assembly files (BOM, pick-and-place centroid data, assembly drawings) to attach the electronic components. ### What are Gerber files? Gerber files are the industry-standard 2D vector image files used by PCB manufacturing machines. Each Gerber file represents a single physical layer of the board, such as the top copper layer, bottom solder mask, or top silkscreen. ### Why are assembly drawings important? Assembly drawings are important as they provide a human-readable map of the board. They show the outlines and reference designators of components, making them essential for manual assembly, visual inspection, and troubleshooting orientation issues (like diode polarity or IC Pin 1 locations). ### How should PCB revisions be documented? Revisions should be tracked systematically using version control software. The specific revision number should be included in the filenames of the export package, listed in the BOM, and physically etched into the copper or printed on the silkscreen of the board itself to prevent version mix-ups on the factory floor. Ready to stop juggling disconnected export steps and version mismatches? [Try Flux](https://www.flux.ai/p) now to eliminate version control nightmares and ensure that your manufacturer receives a clean, accurate, and synchronized package every time. Focus on designing great hardware, and let your tools handle the documentation. ## About the author Gabriel Hacohen Electronics Engineer at Flux Gabriel Hacohen is an electrical engineer with deep expertise in analog circuitry, medical devices, high-performance computing, and semiconductors. He holds both Bachelor's and Master's degrees in Electrical Engineering and has written for companies including NVIDIA, Cadence, Synopsys, Netflix, and Autodesk. 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