{"id":131341,"date":"2026-08-10T02:05:02","date_gmt":"2026-08-10T02:05:02","guid":{"rendered":"https:\/\/www.seeedstudio.com\/blog\/?p=131341"},"modified":"2026-08-10T02:05:04","modified_gmt":"2026-08-10T02:05:04","slug":"seeed-fusion-how-to-prepare-assembly-drawings-and-pick-and-place-files-for-seeed-fusion-pcba","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2026\/08\/10\/seeed-fusion-how-to-prepare-assembly-drawings-and-pick-and-place-files-for-seeed-fusion-pcba\/","title":{"rendered":"How to Prepare Assembly Drawings and Pick-and-Place Files for Seeed Fusion PCBA"},"content":{"rendered":"\n
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\ud83d\udccb <\/mark>What This Upload Field Needs<\/mark><\/h2>\n\n\n\n

When you order PCBA on Seeed Fusion, you need a Pick-and-Place file and an Assembly Drawing. If your project has special assembly requirements, you can also include prototype photos, 3D drawings, or other reference material.<\/p>\n\n\n\n

Each file answers one question:<\/p>\n\n\n\n

File<\/strong><\/td>The question it answers<\/strong><\/td>What it contains<\/strong><\/td><\/tr>
BOM<\/strong><\/td>Which components are used?<\/td>Part numbers, quantities, designators<\/td><\/tr>
Pick-and-Place file<\/strong><\/td>Where does each component go?<\/td>Designator, X\/Y, rotation, top\/bottom<\/td><\/tr>
Assembly Drawing<\/strong><\/td>How should each component be installed?<\/td>Position, outline, Pin 1, polarity, orientation<\/td><\/tr>
Reference material<\/strong><\/td>Any special assembly requirements?<\/td>Prototype photos, 3D drawings, notes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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\ud83d\udccd What Is a Pick-and-Place File?<\/mark><\/h2>\n\n\n\n

Centroid file, pick-and-place file, XY file, position file, and component placement list usually refer to the same thing:<\/strong> a data file that records the location and mounting orientation of each component. Different design tools and manufacturers may use different names.<\/p>\n\n\n\n

A pick-and-place machine reads this file to get each component’s designator, X\/Y coordinate, rotation, and board side, then places the SMT components accordingly. Boards with only through-hole components<\/strong> usually don’t need one.<\/p>\n\n\n\n

A simplified example:<\/p>\n\n\n\n

Designator<\/strong><\/td>X<\/strong><\/td>Y<\/strong><\/td>Rotation<\/strong><\/td>Side<\/strong><\/td><\/tr>
R1<\/td>25.40 mm<\/td>18.20 mm<\/td>90\u00b0<\/td>Top<\/td><\/tr>
U1<\/td>42.60 mm<\/td>30.15 mm<\/td>0\u00b0<\/td>Bottom<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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\ud83d\udca1 Seeed Fusion accepts coordinate files in table format (CSV). Most EDA tools can export this directly, so it’s the recommended format for faster processing.<\/p>\n\n\n\n

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\ud83d\udcd0 What Is an Assembly Drawing?<\/mark><\/h2>\n\n\n\n

An Assembly Drawing is the visual reference engineers use to confirm component positions and mounting orientation.<\/strong> A clear one shows component designators, outlines, and positions, along with direction information such as IC Pin 1, diode polarity, and connector orientation.<\/p>\n\n\n\n

If both sides of the PCB carry components, provide both a Top and a Bottom Assembly Drawing<\/strong>. Export it as a clear, correctly oriented PDF that shows one full board side.<\/p>\n\n\n\n

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The pick-and-place file provides mounting coordinates; the Assembly Drawing provides a visual placement check.<\/strong> Used together, they reduce ambiguity in component position, orientation, and polarity.<\/p>\n\n\n\n

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\ud83d\udee0\ufe0f How to Export Assembly Files from Eagle<\/mark><\/h2>\n\n\n\n

Export a Pick-and-Place File<\/h3>\n\n\n\n

Open the .brd<\/code> file in Eagle and select File > Export > Mount SMD<\/strong>. Eagle generates .mnt<\/code> and .mnb<\/code> files for the top and bottom component positions. If both sides carry SMT components, keep both files. These files can be uploaded directly; if you want table format, open them in Excel and save as CSV<\/strong>.<\/p>\n\n\n\n

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Export an Assembly Drawing<\/h3>\n\n\n\n

Click Layer Settings<\/strong>. For the top-side drawing, select these layers:<\/p>\n\n\n\n