Tag Archives: solder alloy

Low-Temperature Solders: Niche No More?

Folks, It surprises many people that the foundation metal of almost all solder alloys is tin. Alloy elements such as lead, silver, copper, indium, etc., are extremely important, as they lower the solder melting temperature below tin’s relatively high 232°C … Continue reading

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Measuring Alloy Density

Folks, In the category of interesting requests, Ron, a gold worker, from Guyana, sent me the following note: Dr. Ron, My colleagues use a “wet” gold technique to measure gold alloy density.  Is this valid?  Where does the formula come … Continue reading

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Weibull Analysis II: The Curse of the Early First Failure

Folks, In continuing our discussion on Weibull Analysis, let’s assume we assembled some SMT and through-hole PCBs with lead-free solder paste. On this board are also some bottom-side terminated (BTC) components (often called QFNs), that are also assembled with solder … Continue reading

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Interpreting Weibull Plots: I

Folks, A while ago I discussed the Weibull Distribution and its importance in electronics reliability analysis. This distribution has been used to evaluate the life of solder joints whether formed in SMT, wave, or even using solder preforms. In the … Continue reading

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