Distinguish between PCB design via cover oil and via window opening

With regard to "via oil cover" and "via window opening" (VIA and PAD are different in usage), many customers and PCB design engineers often ask what this means when placing orders on the system, and which option should I choose for my file? The following is a description of this problem:

This problem is often encountered. The design is seriously non-standard, and it is not clear that it is a pad, which is the use of via. Sometimes conductive holes are treated with pad attributes, and sometimes keyholes are treated with via attributes. The design of VIA attributes and PAD attributes is confused, which leads to incorrect processing. This is also one of the problems that often cause complaints. For circuit board production plants, when processing CAM data, some film processing engineers, Because the customer's design documents are not standardized, they will correct the mistakes, help the customer to modify the documents, make the non-standard design right, and process the engineering data with their own experience, which leads to and encourages the customer's non-standard design. Princycircuit hereby states that: the last time you did right, it does not mean your documents are right! All engineers must pay attention to the design standards and specifications! PlinCircuit will again strictly require all film processing engineers to maintain the status quo of customer documents as much as possible! As far as possible, it should be handled according to the design specifications and standards, not according to the so-called experience! Show the problems, so that you can give design engineers a reference, improve design quality and reduce problems!

This article mainly explains conductive holes, keyholes, and the connection between protel/pads/and geber files Conductive holes: via Keyholes: Several problems that are particularly easy to occur with pad: 1. The mixed use of pad and via leads to problems. 1. When your file is pads or protel, it is sent to PCB factories and requires oil to cover the holes. Be careful to check whether your plug-in holes (pads) also use via, Otherwise, your plug-in hole will also be covered with green oil, which will lead to the inability to weld the dispute points: the plug-in hole must be sprayed with tin, how do you cover the oil, and how do I use it? Please check the file when you say this, whether it is a pad design or a via design!

2. When your document is pads or protel, send it to the factory. The order requires that the conductive hole be covered with oil. Many customers use pad (plug-in hole) to represent the conductive hole, which causes your conductive hole to open the window. Maybe you want the conductive hole to cover with oil. At that time, the point of dispute may be that I want the conductive hole to cover with oil. Why do you open the window? Please check your document design!

If you are a via, you will be treated as a via. If you are a pad, you will be treated as a pad! Because no one will know that you are a conductive hole, that is a plug-in hole, and via and pad are the only signs, please be clear!

2、 Via In the conversion process, the design is not standard or you are not clear about the conversion gerber setting rules, which leads to problems. When you send a gerber file, the manufacturer cannot distinguish between those that are through holes and those that are keyholes. The only thing that can be identified is processing according to the file. If there is a soldering layer, there is a window! Argument point: I asked for oil through the hole. Now you have opened the window for me. I may cause a short circuit. Please check your file. Your gerber is a film file. The factory has no way to check your conductive hole or keyhole. Please check the gerber file. If there is a soldering layer, open the window. If there is no oil, cover it. 3. How to design oil through the hole in protel or pads—— This is the most standard practice. If the design is standard, there will be no mistakes!

There is a tenting option in the via attribute of protel. If it is checked, it must be oil capping, and then all the oil you transfer out is oil capping. In pads, the method of transferring pads to files is to think about the hole (via) oil capping: when outputting soldermask, i.e. solder mask, just check the upper soldermask top -- the following via represents all the through hole windowing, and if it is not checked, it is through PCB hole oil capping. To sum up: pad is made according to pad, this is the plug-in hole, Via You have two choices. If you provide the original file, you can choose it when placing an order. If you provide the gerber file, you must check whether the gerber file meets your requirements!