2011 https://www.eetimes.com/document.asp?doc_id=1258963 " "This is an unfortunate coincidence where 90-100 percent of the world's supply of bismaleimide triazine is made in northeastern Japan,"
1993 https://apnews.com/8fe2925b68d34d33f19a53e4892c74a2 "epoxy resin has been the talk of the computer chip business for the past month after an explosion destroyed a Japanese factory that made 60 percent of the world’s supply."
> if we can at least fallback to 80-s chips production in case of a supply chain collapse.
Not literally, most of the 80s US chip manufacturing sites are Superfund sites now.
https://www.sciencealert.com/vintage-vacuum-tube-tech-could-...
Also regular vacuum tubes are still pretty competent for power applications.
Making a switching power supply might be a challenge though - we would have to return to using Thyratrons which contain mercury vapour.
Power diodes are not going to be a problem, they are a comparatively crude device from the 50s.
Still, even the thought of a collapse for chips is scary. I wonder if we can at least fallback to 80-s chips production in case of a supply chain collapse.