Seems pretty clear to me. No offense, but I think you're going to struggle with your design if you had trouble interpreting this info:n1ist:
- I don’t understand why there is two table of information with the nearly same information!
The part comes in two versions. They differ in the thichness of the package. You use the table for the version of the part you are buying. It looks like the PCB footprint would be the same for both versions.
- What is the meaning of this 8x used in various ways, like 8Xe, 8Xb, and at the bottom: 8X8X1?
8Xe means 8 times the value corresponding to e.
8x8x1 is the overall nominal package size, 8mm x 8mm x 1mm
- What is the radius of each ball there please? Can’t read it!
It’s spec’ed as 81Xb, so each ball has a diameter of b (0.35 to 0.45 mm)
/mike
1: yes, the footprint would be the same for both versions. Not sure why they have a separate table for each version, but it doesn’t matter.
3: 8Xe means all pin spacings are the same (e=0.8mm)
4: 81Xb means all 81 balls are the same (b = 0.35mm to 0.45mm)