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Abstract

An alloy suitable for use in a ball grid array or chip scale package, the alloy comprising from 0.05-1.5 wt. % copper; from 2.5-5 wt. % silver; one or both of from 0.005-0.3 wt % nickel and/or from 0.003-0.3 wt % chromium; from 0-0.1 wt. % phosphorus; from 0-0.1 wt. % germanium; from 0-0.1 wt. % gallium; from 0-0.3 wt. % of one or more rare earth elements; from 0-0.3 wt. % indium; from 0-0.3 wt. % magnesium; from 0-0.3 wt. % calcium; from 0-0.3 wt. % silicon; from 0-0.3 wt. % aluminium; from 0-0.3 wt. % zinc; from 0-2 wt. % bismuth; from 0-1 wt. % antimony; from 0-0.2 wt % manganese; from 0-0.3 wt % cobalt; from 0-0.3 wt % iron; and from 0-0.1 wt % zirconium; and the balance tin, together with unavoidable impurities.

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First Claim