In PCBA SMT processing, if you need the supplier to provide one-stop PCBA processing service, then the communication and cooperation in the early stage need to be more adequate. The contract for labor and material service requires PCB board manufacturing information and assembly instructions, BOM list, Gerber information, etc. The lack of a certain item of information will cause an increase in communication costs and delays in delivery, which will have a very large impact on the timely launch of the product.
So today we start from the SMT supplier's angle of view, and analyze why we need relevant information:
1. Gerber data, (includes Pad layer, solder mask layer, silk screen layer, and paste layer),
It is a highly authoritative document in SMT processing, because the follow-up PCB quotation and assembly quotation all need Gerber files for reference. The stencil must be used for SMT processing, so the information of the stencil layer must be known when making stencil.
2. BOM list (component list),
It is what materials are included on a PCBA board. These corresponding materials have different brands, part numbers, and specifications, so the prices are also different, and the calculation of the assembling fee also needs to be evaluated based on the quantity of the components.
3. Coordinate file,
It mainly locates the coordinates of the components, and the file is needed when SMT engineers make assembly program for the PCB project.
4. Process instruction documents,
For controlling the process in PCB assembly factory, it will generally contained as some guidance documents for the PCB manufacturer, including special needs and special design points.
5. Test instructions.
There are various test items and categories, including test parameters and technical indicators, and abnormal on-site treatment methods.
The above 5 points are the information needed in SMT processing.