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They said it was a 12 layer board, and the bump pitch for the interconnects is 130um (0.003" about, for pitch!) So what the line width and space width is would be very fine for pcbs. And what would via hole diameter be, and how are they made. How are the layers aligned and stacked, are they done like laminated pcb, or is the entire structure built up layer by layer by deposition and etch more like an IC?
A few years ago, 10 or 15, a few, I was experimenting with a waste oil burner and purchased a 0.010 carbide drill with a 1/8 shank to fit a die grinder collet. I was amazed that the company listed their smallest bit at 0.001. Even the 0.010 could only do a series of pecks gradually ...
I used a lathe with the die grinder mounted in the tool post and work piece chucked with the spindle locked. It would take quite some time to do one hole through 12 pcb layers otoh there could be quite a gang of bits in sync. Layers could be drilled individually. Copper wire with ball endo... My $0.02
>And what would via hole diameter be, and how are they made
And what would via hole diameter be, and how are they made. How are the layers aligned and stacked, are they done like laminated pcb, or is the entire structure built up layer by layer by deposition and etch more like an IC?
All good questions. None of which I have real answers for. Now I suspect that the vias are probably small enough that they have to be laser drilled. And for small volumes, that can be horrifyingly expensive. That isn't a NRE, though. And I suspect that if it is done more routinely, there is no reason why it can't be cheaper.
Regardless, it would be interesting to know what the costs are. And what effect volume has. If this is something that can be justified in a production run that numbers in the thousands, it can be a real game changer.
One wonders why they couldn't let customers do this too, and sell them the component level die, including other vendors doing the same, and then OEM customers can develop their own final package mix of die, for a System on Substrate device.