IPC International Community magazine an association member publication
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42 I-CONNECT007 MAGAZINE I MAY 2026 major innovations in anode design, electrolyte distribution, contamination control, and transport precision. These advancements collectively de- liver superior uniformity, improved microvia cop- per structure, enhanced system sustainability, and lower cost of ownership. Process Background and Core Advantages of Flash Plating The previous generation of flash copper plating systems gained substantial industry adoption due to an efficient wet in wet integration between electroless copper deposition and electrolytic flash copper reinforcement. Key advantages of this ap- proach include: 1. Prevention of oxidation: Direct transition be- tween process steps avoids drying-induced oxidation on electroless copper, preserving interface quality and improving metallurgical bonding. 2. Enhanced BMV reliability: The process effec- tively reinforces copper in BMV wedges, masks glass protrusions, and levels irregular drilling defects, leading to durable via structures. 3. Superior copper-to-copper epitaxy: A highly uniform crystallographic transition between electroless and electrolytic copper improves electrical and mechanical reliability. These strengths form the performance baseline for the newly enhanced plating system. Next-generation Plating System Design To better meet the stringent technological require- ments of advanced HDI manufacturing, the system was optimized to ensure uniform surface copper distribution. This was achieved through a compre- hensive redesign of the anode system, focusing on fluid dynamics and electric field control. Redesigned Anode Box for Superior Uniformity The newly engineered anode box increases flow rate by more than 130% and triples the number of spray nozzles, producing a far more uniform and controlled spray pattern. At the same time, the up- graded filter pump circuit boosts energy efficiency, cutting power consumption by over 40% per cubic meter of transported fluid. To enhance electric-field control, the anode was resegmented to provide 50% more independently controlled zones within the same footprint, sig- nificantly improving copper uniformity, especially behind the clamp area, where thinner copper-clad is prone to edge etching. A redesigned clamp with advanced 3D printed shielding further redirects field lines and improves electrolyte exchange. Together, these upgrades minimize edge etching and ensure more consistent plating quality across the entire panel. Advanced Particle Control for High-yield Manufacturing Effective particle control is essential for maintain- ing high yields in advanced plating. To prevent par- ticle ingress at known generation points—such as the clamp's sliding contact—a targeted extraction system was added to capture debris immediately and route it to a dedicated collection chamber, keeping contaminants out of the electrolyte. The anode box was fully enclosed with glass lids to block airborne particles from settling on its surface. Electrolyte management was also strengthened through a major upgrade of the filter pump circuit, increasing filtration efficiency by 210%. A new catwalk behind the filtration unit allows for quick, convenient filter changes, minimizing downtime and supporting stable, high quality production. Figure 1: Low copper thickness (on top) for good L/S capabil- ity and high copper thickness (on bottom) for good reliability.