PCB News - The usage of pad and via in PCB design

For some customers, the design is seriously non-standard, and it is not clear that it is the pad and the use of via. Sometimes the conductive hole is processed by the pad, and sometimes the key hole is processed by the via. The design is confusing and the error is increased. According to incomplete statistics, problems caused by design irregularities account for more than 50% of customer complaints. For the current situation of circuit boards, some film processing engineers, because of the irregular design documents of customers, will make mistakes and help customers modify the documents., Do the irregular design right, and deal with the engineering data based on your own experience. This has led to and contributed to the customer’s irregular design. Once again, the last time you did it right does not mean that your file is correct. of! All engineers must pay attention to design standards and specifications!

This article mainly explains the connection between conductive holes, key insertion holes, and protel /pads/ and geber files
Conductive hole: via
Keyhole: pad
Several problems that are particularly prone to occur:
1) Pad and via are mixed together, causing problems
1) When your file is pads or protel, send it to the factory and ask for via hole cover oil. Please pay attention, you should carefully check whether your plug-in hole (pad) is also available via via, otherwise yours The plug-in hole will also be coated with green oil, which will make it impossible to solder. Dispute: the plug-in hole must be sprayed with tin on it. How do you cover the oil? How do I use it? Please check the file when you say this. Is it a pad design or a via design!
2) When your file is pads or protel, send the file to the factory. The order requirement is via hole cover oil. Many customers use pads (plug-in holes) to indicate conductive holes, which will cause your conductive holes to open. Maybe what you want is via hole cover oil. At that time, the point of dispute may be that what I want is conductive hole cover oil. Why did you open the window? Then please check your file design!
Jia Li Chuang emphasizes this point repeatedly, if you are via, press via, and if it is pad, press pad! Because no one will know that yours is a conductive hole, that is a plug-in hole, and via and pad are the only identifiers, please be clear!
2) During the via conversion process, problems occur due to non-standard design or you are not clear about the conversion gerber setting rules
3) When you send a gerber file, the factory cannot tell which are via holes and those are keyholes. The only thing that can be identified is to process according to the file. If there is a soldering layer, there will be a window! Dispute point: I want the via hole to be oiled. You have opened the window for me now. I may cause a short circuit. Please check your file. The gerber you issued is the film file. The factory has no way to check that yours is conductive. The hole is still a key hole. Please check the gerber file to see if there is a soldering layer. If there is, open the window, if not, cover the oil.
Three: How to design via hole cover oil 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 property in Protel. If you check it, it must be covered with oil. Then all you turn out are covered with oil.
In pads, the way to transfer files from pads to via is to cover oil:
When outputting the soldermask, that is, the solder mask, just check the solder mask top ---- the vias below, which means all the vias are windowed, if not checked, the vias are covered with oil.

The above is the introduction of the usage of pad and via in PCB design. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.