![]() ![]() Alloys are called eutectic when the solidus and liquidus are equal.In between the solidus and liquidus, a region called the plastic range, some portion of the alloy is solid but the majority is liquid.Below the solidus, an alloy is 100% in a solid state.The phase change from the solid state to the liquid state begins upon reaching the solidus and ends upon reaching the liquidus. *Eutectic – Solidus and Liquidus are equal **MP – Melting pointĮach alloy has temperatures at which it changes from solid to liquid ( Figure 1). Some applications that fall under the RoHS directive are exempt from being lead-free because the reflow temperature requirements can only be met with high-lead solder alloys which are exempt under RoHS regulation.įigure 1. Sometimes this is due to the product falling under the RoHS (Restriction of Hazardous Substances) directive and sometimes it is a corporate directive. Many applications have a requirement for use of lead-free solder alloy. What type/size does the power need to be for the smallest feature in the application?. ![]()
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