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Usage of VIA and PAD when protel designs PCB


Regarding the "perforated cover oil" and "perforated window" (the distinction between VIA and PAD), many customers and design engineers often ask what this means when the system is placed on the system. Which one should I choose? Option? Here is a description of this problem:

I often encounter such problems, the design is not standard, and it is impossible to tell which is the pad. That is the usage of via. Sometimes the conductive hole is processed by the pad attribute. Sometimes the keyhole is processed with the via attribute. VIA The confusing design of attributes and PAD attributes leads to erroneous processing, which is one of the problems that often arise from complaints. For circuit board manufacturing plants, when dealing with CAM data, some of the processing of film engineers, because the customer design files are not standardized, will be wrong, Helping customers to modify the documents, correcting the non-standard design, and processing the engineering materials with their own experience, which leads to and encourages the customer's design to be irregular. Jeddah has explained this: the last time you did the right thing, Does not mean that your documents are correct! All engineers must pay attention to design standards and specifications! Jeddah will once again strictly require all processing of film engineers to maintain the status of customer documents as much as possible! As far as possible, according to the design specifications and standards, can not be handled according to the so-called experience! Reflect the problem, so that you can give the design engineer a reference, improve the design quality and reduce the problem!

This article mainly explains the conductive holes, keyholes, and the contact between the protel / pads / and geber files: via keyhole: pad is particularly prone to several problems: First, the use of pad and via mixed, resulting in Problem 1. When your file is a pad or protel, send it to the factory, ask for the hole cover oil, be careful, you have to check carefully whether your plug hole (pad) is also useful for via, otherwise Your plug hole will also be covered with green oil, which will not be able to solder the dispute point: the plug hole must be sprayed on the top, how do you cover the oil, how do I use it, please check the file when saying this. , is the pad design or via design!

When your file is a pad or protel, send the file to the factory. The order is required to be over-hole cover oil. Many customers use pad (plug-in hole) to indicate the conductive hole, which causes your conductive hole to open the window. Maybe you What I want is the over-hole cover oil. At that time, I may dispute the point. What I want is the conductive hole cover oil. Why do you open the window? Please check your file design!

Usage of VIA and PAD when protel designs PCB

Again, as follows, if you are via, press via, if it is a pad, press the pad! Because no one will know that you are a conductive hole, it is a plug hole, and via and pad are the only logo, please be clear!

And via in the conversion process, because 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 factory manufacturer can not distinguish those that are via holes and those are keyholes. The only thing that can be identified is the processing by file, which helps the solder layer to open the window! Dispute point: I want the hole to cover the oil, you open the window for me now, I may cause a short circuit, then please check your file, your gerber is the film file, the factory has no way to check that you are conductive Hole or keyhole, please check the gerber file, is there any help layer, if any, open the window, if not, then cover the oil three, how to design the perforated cover oil in protel or pads! - This is the most standard practice, if the design standards, then it will not go wrong!

In the protel in the via attribute there is a tenTIng option, if you put a tick, it must be covered with oil, then you turn it out is all over the oil, in the pads, the pad to file is to pass the hole (via) cover oil method : When you output the soldermask solder mask, just check the upper solder mask top - the via below means that all the vias open the window. If you don't check it, the via cover oil is summarized: the pad is pressed by the pad, this is the plug hole. , via you have two choices, if you provide the original file, let you choose when ordering, if you provide gerber files, be sure to check if the gerber file meets your requirements!