Incomplete BOM and Component Selection: Another severe mistake that designers overlook is verifying the correctness of the Bill of Materials (BoM). The right materials are essential for the efficient operation and performance of the PCB. Common mistakes include missing components, incorrect part numbers, incomplete specifications, and outdated information. If you share incomplete or incorrect BoM with your PCB manufacturer, it can lead to wrong assembly, rework, delay in deliveries, and consume extra cost. It is also essential to share the updated BoM. It is always a good practice to replace the old BoM with the new one with a revision number. Moreover, replace the old materials with the latest ones and mark obsolete items. To reduce the delivery lead time, you need to strategically highlight the longer lead-time items for early ordering.

Inadequate Documentation: 
The success of PCB assembly relies heavily on clear and thorough documentation. Provide all necessary information for assembly, such as schematics, component placement details, and any other prerequisites. Clearly outline procedures for quality assurance testing, soldering, and inspection. Your chances of receiving a high-quality, error-free PCB assembly increase with the depth and precision you provide in your documentation.