Mar15
Why BGA soldering ball always crack(9)? Increase the resistance of components to stress

post on March 15, 2023

How to increasing the ability of components to resist stress?(Continuing from the previous article)

2. No solder balls on BGA four corners, or use dummy balls instead of them.

If you had studied the actual phenomenon of BGA solder cacking under a microscope, you should find that most BGAs start to break from the solder balls at the four corners. This is because the four corners of the BGA have the farthest distance from the force moment of the board bending, so they are also the positions that sustain the maximum stress during the board bending and warping, and of course, are the most likely to cause solder ball fractures.

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Design, PCB/FPC/PTF, SMT, Soldering     WorkingBear    Views (1,817)     comment (0)
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Mar10
Why BGA soldering ball always crack(8)? Increase PCB stiffness to resist stress and avoid board bending

post on March 10, 2023

same PCB layers with different stack-up

In the previous article, WorkingBear talked about how to improve the adhesion of PCA to resist the impact of stress. Today, We will move on to another topic: “How to increase the ability of components or circuit boards to resist stress?” Because the maximum impact of stress on solder cracking is board bending, we only need to think about how to enhance the product’s ability to resist the stress impact caused by board bending to solve the problem of solder cracking.

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Design, PCB/FPC/PTF, SMT     WorkingBear    Views (2,241)     comment (0)
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Mar07
Why BGA soldering ball always crack(7)? The Bonding force between solder pad of copper foil and PCB substrate

post on March 7, 2023

PCB is composed of layers of Copper Clad Laminate (CCL) and Prepreg (PP) stacked together. In modern PCB manufacturing, CCL has become a standard material. Each CCL manufacturer provides customers with product specifications that indicate the peel strength of the CCL. From these specifications, we can see that the peel strength is higher when using 1.0 oz copper foil thickness than when using 0.5 oz. Different models and manufacturers of CCL also have different peel strengths, so selecting the appropriate CCL specifications is necessary to enhance the bonding force between the copper foil and PCB substrate.

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Design, SMT, Soldering     WorkingBear    Views (3,229)     comment (0)
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Mar01
Why BGA soldering ball always crack(6)? The recommendation of BGA pad design from workingbear

post on March 1, 2023

Below are recommendations for BGA pad design to enhance the soldering strength from Workingbear.

We had several pages talking about the relationship between solder cracking and bonding force. Workingbear personally doesn’t think that making design a change to the pad of PCB can help much with the ability of BGA soldering to resist stress, as it is like a drop in the bucket! A board’s bending or deformation can easily negate all your efforts in improving pad design and solderability. Workingbear still thinks that strengthening the mechanism design and improving the board’s ability to resist bending and deformation is the best solution to fix BGA solder cracking.

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Design, SMT, Soldering     WorkingBear    Views (2,900)     comment (0)
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Feb22
Why BGA soldering ball always crack(5)? Increase the contact area of solder to increase its strength

post on February 22, 2023

In the previous article, we talked about “How to Increase the bonding force for PCBA by using “Copper” base as the PCB surface finish“. Today, we will discuss further how the SMD (Solder Mask Defined) and NSMD (Non-Solder Mask Defined) pad designs of the BGA package affect the solderability and how these two types of pads affect the bonding force of PCA.

Increasing the solder contact area of a component terminal or leads will generally improve the solderability of the component, as it provides more surface area for the solder to wet and bond to the terminal. This can result in a stronger and more reliable solder joint.

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Design, SMT, Soldering     WorkingBear    Views (2,909)     comment (0)
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