For some customers, the design of PCB is seriously nonstandard, and they simply can’t tell whether it’s pad or via. Sometimes conductive holes are treated with pad, and sometimes key holes are treated with via. The design confusion leads to more errors. According to incomplete statistics, the problems caused by nonstandard design account for more than 50% of customer complaints. As for the current situation of circuit boards, some film engineers, because of the nonstandard design documents of customers, Instead, make mistakes, help customers to modify documents, make irregular designs right, and handle engineering materials with their own experience. This will lead to and encourage customers’ irregular designs. Again, just because you did something right last time doesn’t mean your documents are right! Please all engineers must pay attention to design standards and specifications! This article mainly explains the connection between conductive holes, key insertion holes, protel /pads/ and geber files. Several problems that are particularly easy to appear in conductive holes: via key insertion holes: pads:
1) pad is mixed with via, which leads to problems. 1) when your file is pads or protel, send it to the factory, and ask for oil to cover the hole. Be sure to pay attention to it. You should carefully check whether your plug-in hole (pad) is also used with via, otherwise, your plug-in hole will also be coated with green oil, which will lead to the inability to weld the dispute point: the plug-in hole must be sprayed with tin. How did you cover the oil? How can I use it? In 2) When your document is pads or protel, send the document to the factory. The order requirement is via hole cover oil. Many customers use pad (plug-in hole) to represent conductive hole, which leads to your conductive hole opening. Maybe you want via hole cover oil, and then the argument may be that what I want is via hole cover oil. Why did you open the window? Please check your document design!
2) In the process of via conversion, the design is not standard or you don’t know the rules for converting gerber, which leads to problems. 3) When you send gerber files, the pcb proofing factory can’t tell which ones are through holes and which ones are key holes, so the only thing that can be identified is to process them according to the files. If there is solder layer, there is a window opening! Point of dispute: I asked for the hole covered with oil. Now you have opened the window for me, which may lead to a short circuit. Please check your document. The gerber you issued is a film document. The factory has no way to check whether your conductive hole or key hole is covered with oil. Please check the gerber document to see if there is a solder layer. If there is, open the window. If not, cover it with oil.
Three: How to design hole capping oil in protel or pads! —–This is the most standard practice now. If the design is standard, there will be no mistake! There is a stretching option in the via attribute of protel. If it is ticked, it must be covered with oil. Then all the oil you transfer out is covered with oil. In pads, pads files are covered with oil through holes. The method: when outputting soldermask, that is, solder resist, just check the upper solder mask top —- the lower vias, which means all the vias are opened. To sum up: pad is done by pad, which is the plug-in hole. via, you have two choices. If you provide the original document, you can choose it when you place an order. If you provide gerber document, please check whether gerber document meets your requirements!