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62 SMT007 MAGAZINE I OCTOBER 2026 F E AT U R E A RT I C L E BY SENTHIL KANAGAVEL , MACDERMID ALPHA ELECTRONICS SOLUTIONS There is a single decision at the center of every die-attach conversation right now that isn't as much about chemistry as it is about control. This is most evident because silver prices have experi- enced significant volatility, evolving PFAS require- ments are increasing regulatory and customer scru- tiny, qualification windows are shrinking, and the packages that support AI, automotive, and power infrastructure must meet demanding performance and reliability requirements. The engineer responsible for die attach material selection must balance all these requirements simul- taneously: manage cost exposure, demonstrate reli- ability, address evolving compliance requirements, and protect throughput, while selecting the material and process best suited to the applications. That is a lot to put on a single bond line. When looking at silver, for example, instead of simply asking, "How can we reduce silver?" we should ask, "Where does a copper-based alternative make technical and commercial sense, and how do appli- cation requirements guide the decision?" Copper is already widely used in interconnects, lead frames, and substrate metallization. When engineered into a conductive die attach paste, it can provide the thermal, electrical, and mechanical characteristics required for appropriate applications while reducing exposure to silver-related cost volatility. ATROX CD 560-1 is not a replacement for every silver application, but rather a copper-filler die- When Does Reducing Silver Make Sense? Figure 1: A close-up of a semiconductor packaging line during die attach, where a pick-and-place head positions a bare silicon die onto a lead frame substrate.