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P0.80, P0.93, P0.78 MiNi small pitch LEDHDI
Release time:
2022-06-21 13:57
Is SMD or NO-SMD used for the pads of small interval LED display information board PCB? Is Solder Mask Define or No Solder Mask Define used for small interval (P2~P1) LED display information LED light strips? Is it defined by industry experience? We warmly welcome everyone to discuss.
P0.80, P0.93, P0.78 Small pitch LEDHDI
Is SMD or NO-SMD used for the pads of small interval LED display information board PCB? Is Solder Mask Define or No Solder Mask Define used for small interval (P2~P1) LED display information LED light strips? Is it defined by industry experience? We warmly welcome everyone to discuss.
The benefits of the Solder Mask Define design scheme include
1. The PAD should be neat, round or square, so that the amount of tin is evenly distributed and electronic components are not easily pulled off.
2. The PAD is encapsulated by a solder mask layer, and theoretically, the compressive strength of the PAD should be better than that of No SMD.
3. The solder paste is not easy to fall into the grooves of PCB boards without solder layers or solder joints like No SMD PAD solder paste, and it is not easy to cause tin slag after passing through the furnace. We warmly welcome everyone to fill in the gaps. We warmly welcome experts to describe how the SMD solder layer is not easy to fall off during maintenance. At the design level, NSMD will be simpler.
Do I think an LED would have this indispensable feature? Isn't a PAD too big? Looking around, the common products are all SMD design solutions, indicating that SMD definitely has more benefits.
Thank you all for your responses. It is likely that there are relatively few people who make display information boards. Is there any teacher who can expand this and provide training and learning opportunities for everyone.
Regardless of SMD/NSMD, the specifications manipulated by the board factory are the same. If this causes varying degrees of damage on Ground/Race, DFM can be developed to determine whether NSMD's tensile strength is better than SMD's. SMD's application in our area is mainly due to poor packaging and printing, especially HDI boards. In other areas, NSMD is still the main material. SMD solder layers have good compressive strength but large PADs, and green oil is estimated to have a height of around 10UM above the PAD
In addition, the industrial white oil line has a height of 15UM and a thickness of 0.1MM, and the tin printed on the steel wire mesh is very thick, with a thickness of 0.12M. In addition, the tin printed on the mesh also has a pointed condition, which is not within the range, and it is very easy to connect the tin.
If NSMD can use OSP processing technology for anxiety compressive strength, the advantage is that it has a small PAD, a solder bridge, and the solder bridge is like a drainage ditch. Water only sinks in the mud and is not easily deposited in other areas, resulting in a low probability of tin connection. I have a preference for NSMD processing technology. The production process is easy to manipulate, and weaker ones will be much lower. There are still many experts in the design, production, and processing of fixture and tooling schemes·
Kay_zhang: Do I think an LED would be indispensable? Isn't a PAD too big
If the LED display information board has a highly concentrated surface LED array, the same changes will move the whole body up and down.
I have seen both types before, but I have not conducted careful scientific research on which one is better or worse. Reminder: Click on this link to inquire about the spare parts and picture materials in the article, and you can apply to participate in the community forum on this website for many discussions about "whether SMD or NO-SMD is used for the pad of the small interval LED display information board PCB"
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