Why Your BGA Boards Crack — The Hidden Battle of CTE, Tg, and Via-in-Pad

Why do BGA boards fail in the field after passing every assembly test? In this deep-dive, we break down three concepts every PCB designer must understand together: CTE, Tg, and Via-in-Pad. You'll learn: 🔹 How Z-axis thermal expansion cracks via barrels during reflow 🔹 Why Tg alone is the wrong number to spec a laminate by — and what to use instead 🔹 The hidden failure modes inside VIPPO (Via-in-Pad Plated Over) 🔹 Why staggered microvias outlast stacked ones 🔹 A full material comparison: Standard FR-4 vs High-Tg vs Megtron 6 vs Polyimide 🔹 The 6-point release-gate checklist every PCB designer should follow Whether you're routing your first 0.5 mm pitch BGA or troubleshooting field returns on a production board, this video gives you the engineering fundamentals and the practical fab-drawing call-outs to stop these failures before they ship. 📖 Full written article with material table & checklist: https://ecadbridge.com/article/cte-tg-and-via-in-pad/ 🔔 Subscribe for more PCB design deep-dives, eCAD library tips, and manufacturing insights.