Formats Are Required For Quick Turn PCB Assembly
When designing a printed circuit board (PCB), it is important to choose the right file format to ensure that your design is accurate and compatible with the manufacturing process. A proper selection and verification of PCB files ensures accurate manufacturing, efficient assembly, and reliable performance. In addition, a good understanding of emerging file formats allows PCB designers to make more informed design decisions that improve production efficiency.
During the quick turn pcb assembly process, the PCB manufacturer must receive a number of Gerber files from the designer to accurately reproduce and produce the PCB. The Gerber file format is the existing quality standard for transferring all of the necessary PCB information. Using this file format is essential to ensure the integrity and security of all PCB information during the production process.
The Gerber file format is a series of CAD/CAM image files that contain the information needed to manufacture a PCB. These files include a layer-by-layer representation of the circuit board, detailing copper traces, solder masks, and silkscreen layers. These files also provide instructions for etching, soldering, and assembly equipment. Gerber files use the RS-274X format, which supports embedded aperture definitions and file settings.
As the most widely used file format, gerber files are compatible with almost all manufacturers’ systems. However, they do not incorporate advanced data that is critical for high-precision applications, such as stack-up diagrams and component placement information. As a result, they must be supplemented with additional files that detail these details before being sent to the factory.
What File Formats Are Required For Quick Turn PCB Assembly?
One such file type is the Centroid file, also known as Insertion, Pick-N-Place, or XY data. The purpose of the Centroid file is to provide the coordinates for each surface mount component on a PCB, including reference designator, X and Y position, rotation, and side of the board (top or bottom). The information in this file helps automated assembly equipment to accurately place the parts during the rapid PCB assembly process, which improves accuracy and speed.
Another file type is the Bill of Materials (BOM). A BOM describes the components that are to be populated on the PCB, including their part numbers and quantities. The BOM is used to prepare the assembly parts list and ensures that all of the correct items are included in the final product. This is especially crucial when a PCB has specialized requirements, such as impedance control, gold fingers, blind/buried vias, or unique stack up/thickness.
A common mistake that designers make is submitting Gerber files without any of these supplementary files. This can lead to a costly delay in production and delivery of the completed PCB, which can be disruptive for both the designer and the manufacturer. To avoid this issue, it is crucial to carefully review the entire design for manufacturability and submit all of the necessary information. This will help the manufacturer to avoid any errors during the fabrication and assembly processes, and ensure that the resulting products meet the designer’s expectations.
