-
M9 copper clad laminate: the 224G SerDes material set
M9 copper clad laminate is the lowest-loss copper clad laminate in volume production today. Dielectric loss runs 0.0005 to 0.0009 at 10 GHz. Four material families carry that number: a hydrocarbon-dominant resin, quartz fiber cloth instead of glass cloth, HVLP4 or HVLP5 ultra-low profile copper foil, and low-alpha spherical silica filler. Swap any one of them and the stack drops back toward M8. Why M9 exists at all: the loss problem at 224 Gbps Every serial link loses amplitude as it travels. Higher frequency means faster loss, and a shorter distance before the receiver cannot tell a one from a zero. Equalization buys margin back. It also costs power and…
-
Spherical Silica Powder: What HBM and Fast Boards Need
Spherical silica powder is a high-purity inorganic filler that gives epoxy molding compounds and copper-clad laminates their insulation, low thermal expansion, and stable dielectric behavior. Round particles pack far tighter than angular ones, so advanced packaging can load 60 to 90 percent filler without cracking the part. Only chemically produced low-alpha grades clear the radioactivity bar that high-bandwidth memory demands, and that single requirement is why one ton of filler can cost from 1,000 yuan to more than 800,000 yuan. Why a plain white powder became a bottleneck Silica filler used to be a cheap additive nobody thought about. Now it sits at the center of the electronics supply chain…