Files Requirements

Please make sure to prepare the following files. Please put them in a ZIP file.

• PCB - Gerber Files
  • Include all the layers (circuit, outline, drilling, soldermask, silkscreen, solder paste, etc).
• PCB assembly files
  • BOM: Bill of Materials (BOM) in Excel format. Your BOM should include:
  • Manufacturer Part number
  • Reference designators
  • Quantity of each part
  • Part description
  • Type (SMT, Thru-Hole, Fine-pitch, BGA, etc.).
  • Package description (QFN32, SOIC, 0402, 0805, etc. package is very helpful).
• Centroid File
• Also known as pick and place file. It should include component locations, rotations and reference designators.

PCB Fabrication Requirements

1. All Printed Circuit Boards needs to have fiducial marks. If no, we will suggest to add on PCB production.
2. Your PCB length and width need to be at least 1.78 inches (approximately 45mm). If no, we will panelize your boards on PCB production.
3. Components should be at least 0.120 inches (3mm) from board edge. If components are closer or overhang the board edge then borders will be required. When components are close to the edge we prefer tab routs with mouse bites instead of V-scored panels.

Packaging

Please ship all components to:

Please try to ship each kind component separately and do not combine multiple orders in one box, unless the component are clearly marked and separated. All components should have a packing slip listing all the items and quantities included. We appreciate an email sent to us with the tracking information, especially when drop shipping multiple components from suppliers.

Checklist

DITSA wants to provide you with an accurate and smooth assembly process. To ensure that your job is not placed on hold, plese follow these guidelines:

1. Accurate Data

   An error free assembly process requires accurate data. Each job should have a BOM (bill of materials), a pick and place file (also known as a centroid file) andmatching Gerber data. Add a DO NOT POPULATE (DNP) column to the BOM if there are parts which should not be populated on the PCB.

2. Ensure Proper Footprints

   Some parts are available in different packages. Make sure that the part you specify in the BOM matches the footprint on the PCB.

3. Organize Components

   Parts should be separated into individual bags or trays. Each bag or tray should be marked with Manufacturer name and Manufacturer part number and all reference designators where the part is used. If needed, you can substitute distributor name and part number in place of (or in addition to) manufacturer information.

4. Multiple Jobs Per Order

   The parts for each job should be packaged separately. Include separate BOM and pick and place file for each job

5. Component Quantities

   Prototype & Small Build (1 to 25 boards)

   Extra parts will be required on small builds (1 to 25 boards) as follows:

   • 0201 to 0603 size: Minimum extra quantity 50-100 plus required quantity
   • 0805 to 1206 size: Minimum extra quantity 15-20 plus required quantity
   • On large size components 1 or 2 extra parts is fine

   For large runs extra parts 5 or 10% overage is appropriate.

   • All items must be on a continuous strip or reel
   • Special instructions must be provided if components need special handling such as no clean solder
   • Bulks or Trays are okay for THT
   • Avoid order tubes but if any SMD is in tube it must be a full length



6. Update your BOM and Pick and Place File

   If you have any last-minute design changes, please remember to reflect these changes in your BOM, pick and place file and any other relevant documentation.

7. Mark Polarity

   Make sure you indicate proper orientation for all parts that have polarity. Place a dot or a number “1” on pin 1 of ICs where the orientation is not obvious. Ensure that polarized capacitors and diodes are properly marked.

8. Special Instructions

   Provide detailed instructions for any special procedures required to assemble your boards. Include sketches, photos, PDF files and/or drawings as needed

9. Drop Shipping from Suppliers

   Please ask your suppliers to place your DITSA Order Number on the outside of any package dropped shipped to us.