Advanced packaging substrate.

The cost of a CTE mismatch is not constant across a package, it scales with distance from the neutral point. A small die tolerates a substrate that a reticle-limited die does not, and the industry is moving toward panel-level assembly precisely where that penalty is largest. Warpage at reflow, solder joint fatigue at the die corners, and yield loss all grow with area. Organic and standard ceramic substrates ship at a fixed expansion value chosen for a mid-size package, so scaling up means absorbing a penalty that was never budgeted.

Strocera supplies the substrate as a ready-to-fire powder blend with expansion adjustable across 100 to 800 °C, so the value is set for the package you are actually building rather than for a mid-size average. You specify the die size, the stack height, and the reflow profile; the powder mix is adjusted to hold the corner-to-corner budget at panel format. Forming in your own facility keeps panel size and via strategy yours, which matters most at the point where a supplier's standard panel dimension would otherwise set your package size. Thermal conductivity characterization is in progress; current data ships with the qualification package.