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
My project have gone through from design, prototype to mass production after lots of discussion and adjustment. Now the manufacturer are making our products in their product lines. And I would like to know is there any differences between the prototypes in my hand now and the final products output by the manufacturer?
I am designing a prototype PCB for a Lora node. It will have an SMA connector (J2) and a PCB antenna. Switching RF connectors are not available in my area, so as an amateur enthusiast what is a good way to separate the antennas?
After We have assembled the Virtex-4 FPGA BGA package on our custom design PCB, we check for short circuits between all power grounding and they shows short cut between each other. Please tell us about any process for debugging this issue.
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