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Electronic Design
Via cover oil and via opening in PCB design
Electronic Design
Via cover oil and via opening in PCB design

Via cover oil and via opening in PCB design

2021-11-06
View:39
Author:Downs

Generally, regarding the "via cap oil" and "via window opening" points in PCB design (the usage distinction between VIA and PAD), many customers and design engineers often don't know how to choose when placing orders in the system. Which option should I choose for the file? Here is an explanation of this problem as follows:

I often encounter such problems. The PCB design is seriously non-standard, and it is impossible to distinguish between the pad and the usage of via. Sometimes the conductive hole is processed by the attribute of the pad, and sometimes the key hole is processed by the attribute of the via. The design of VIA and PAD attributes is confusing, which leads to incorrect processing. This is also one of the frequent complaints. For circuit board production plants, when processing CAM data, some processing film engineers, because the customer’s design documents are not standardized, and Make mistakes, help customers revise documents, make irregular designs right, and deal with engineering data based on their own experience, which has led to and contributed to the irregular design of customers. Hereby, it is hereby explained: the last time you did the right thing, no Your file is correct! All engineers must pay attention to design standards and specifications. Keep the current status of customer documents as much as possible! Try to deal with the design specifications and standards as much as possible, not according to the so-called experience! The problem can be reflected, so that you can be a reference for the design engineers to improve the design quality and reduce the occurrence of problems !

pcb board

Conductive hole, key hole, and connection between protel /pads/ and geber files: via key hole: pad is particularly prone to several problems: 1. The pad and via are mixed together, which leads to 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 check carefully whether your plug-in hole (pad) is also available with via, otherwise your plug-in hole The upper part will be painted with green oil, which leads to the inability to weld. Dispute point: The plug-in hole must be sprayed with tin on it. How did you cover the oil? How do I use it? When you say this, please check the file. Use a pad. The design is still via design!

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 may cause your conductive holes to open windows. What I want is via hole cover oil. The point of dispute is that what I want is conductive hole cover oil. Why did you open the window? Then please check and confirm your design.

Once again, in the PCB board design, if you are via, please press via, if it is a pad, then press the pad! Because no one will know which conductive hole in your design, which is the plug-in hole, and the only difference between via and pad Logo, please be clear!

There is a tenting option in the via attribute in Protel. If you check it, it must be oil-capped. Then all you transfer out are oil-capped. In pads, when you transfer files from pads, you need to think about the method of via-cap oiling. : When outputting the soldermask that is the solder mask, just check the solder mask top-the via below represents all vias and open windows, if you don’t check it, the vias are covered. To sum up: pad press pad, this is the plug-in hole , Via, you have two options. If you provide the original file, let you choose when you place the order. If you provide the gerber file, please check whether the gerber file meets your requirements!

During the via conversion process, the PCB circuit board design is not standard or you are not clear about the conversion gerber setting rules, which causes problems. When you send a gerber file, the factory manufacturer cannot tell which are vias and those are plug keys. Hole, 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 a via hole cap oil, you open the window for me now, I may cause a short circuit, then please Check your file. The gerber you sent is a film file. The factory has no way to check whether your gerber file is a conductive hole or a keyhole. Please check the gerber file to see if it has a soldering layer. If yes, open the window. If it is, then cover the oil. 3. How to design the via cover oil in protel or pads! This is the most standard way. If the design standard is met, there will be no mistakes!