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You can refer to the following table.
| Ball Dia. | Reduction | Land Pattern Density Level | Land Dia. | Land Variation |
| 0.15 | 15% | C | 0.13 | 0.15-0.10 |
| 0.20 | 15% | C | 0.17 | 0.20-0.14 |
| 0.25 | 20% | B | 0.20 | 0.20-0.17 |
| 0.30 | 20% | B | 0.25 | 0.25-0.20 |
| 0.35 | 20% | B | 0.30 | 0.35-0.25 |
| 0.55 | 25% | A | 0.40 | 0.45-0.35 |
Read More: BGA PCB Assembly
#PCB Design
Washing machine does not work. Since it just bought one years ago, the components in it is not old, I think. So I want to check it from its PCB. Any tips on this?
Is there an industry standard for showing how plates in the SMT cap are oriented? How can you tell if it is a square-rectanguloid instead of being flattish in one dimension?
My mechanical keyborad is brand new so I cannot find where the culprit is. How I fix the key?
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