The difference between through hole cover oil and through hole opening window

The difference between through hole cover oil and through hole opening window

Regarding the point of "Via window opening" and "Via hole cover oil" (the usage distinction between PAD and VIA), many customers and design engineers often ask what this means when placing orders in the system. Which file should I choose? An option? Now the explanation for this problem is as follows:

I often encounter such problems. The file design is not standard, and it is not clear which is the pad and which is 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 VIA attribute and The chaotic design of PAD attributes leads to wrong processing, which is also one of the problems that often appear complaints. As for the circuit board production plant, when processing CAM data, some film processing engineers, because the customer's design documents are not standardized, will make mistakes; occasionally some engineers will help customers modify the documents and make the non-standard design right. The experience of processing engineering data has led to and contributed to the non-standard design of customers.

Circuit board

Hereby explain: The last time you did the right thing, it does not mean that the file is right! All engineers must pay attention to the design standards and specifications. All the film processing engineers are requested to maintain the current status of the customer's documents as much as possible, and deal with them according to the design specifications and standards as much as possible. Reflect the problem, this can be a reference for design engineers, improve the design quality and reduce the occurrence of problems!

This article mainly explains the connection between conductive holes, keyholes, and protel /pads/ and geber files. Conductive holes, via keyholes, pads are particularly prone to several problems:

1. During the via conversion process, problems occurred due to non-standard design or the design engineer's unclear conversion gerber setting rules.

When you send a gerber file, the manufacturer cannot tell which are vias and which are keyholes. The only thing that can be identified is to process by file. Where there is a soldering layer, there is a window. Dispute point: I want the via hole to be covered with oil. Now that the window is opened, it may cause a short circuit. When this kind of problem occurs, you need to check the file, because the gerber is a film file, the factory has no way to check whether it is a conductive hole or a key hole, check whether the gerber file has a solder layer, and open it if it has. If there is no window, cover it with oil.

2, pad and via are mixed together, causing problems.

When the file is pads or protel, send it to the factory and require oil to cover the via hole. Please pay attention, you must check carefully whether the plug hole (pad) is also available via via, otherwise the plug hole will also be painted with green oil , Resulting in failure to weld. Dispute point: The plug-in hole must be sprayed with tin on it, why is it covered with oil? In the same situation, you still need to check the file first, whether it is a pad design or a via design.

When the file is pads or protel, it is sent to the factory. The order is required to be through hole cover oil, but many customers use pads (plug-in holes) to represent conductive holes, which causes the conductive holes to open windows. Maybe what you want is via cover oil. At that time, the point of dispute may be: what I want is conductive hole cover oil. Why did you open the window? At this time, you still need to check whether the file design is standard.

For this point, it is hereby stated that if it is via, it will be processed as via, and if it is pad, it will be processed as pad. Because no one knows which is the conductive hole, which is the plug-in hole, and via and pad are the only identifiers, please know.

3. How to design via hole cover oil in protel or pads?

There is a tenting option in the via attribute in Protel. If you check it, it must be covered with oil, then the transferred gbrber files are all covered with oil; in pads, the transfer of pads to files is to cover through holes (via) Oil method: When outputting the soldermask, which is the solder mask, just check the solder mask top-the via underneath, which means that all vias are opened. If not checked, the vias are covered with oil.

To sum up: pad is made by pad, its own attribute is plug-in hole; via has two options, if the original file is provided, then you can choose when placing an order, if the gerber file is provided, please check whether the gerber file conforms to your requirements!