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% | EEN | 0.40 | 0.45-0.35 |
Lees verder: BGA PCB-assemblage
#PCB-ontwerp
I find that the all types of PCB samples from my suppliers have ground planes. It seems important and I want to know about its function.
(Van ieder bord dienen wij een ontwerp in voor montage, sommige ontwerpers kunnen PCB-fabrikanten in verwarring brengen over de oriëntatie van diodes of LED's. En we hadden zowel de standaarddiodes van Eagle als de standaarddiodes van KiCad teruggestuurd door de Chinese fabriek.)
I designed a PCB with an imaging sensor that is mechanically coupled to a lens assembly using four 2-56 schroeven. I’m noticing that even though the screws are holding the board tightly against the mechanical structure if I flick or lightly knock the the assembly the image “moves”. I’m hoping to get a few suggestions for ways to fix the PCB to the mechanical structure. Any suggestions for adhesives or the like? Something else?
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