Lead-free solder composition

Abstract

An electrical connector includes a first layer having a first coefficient of thermal expansion and a second layer overlaying the first layer having a second coefficient of thermal expansion. A first difference between the first coefficient of thermal expansion and a coefficient of thermal expansion of glass is greater than a second difference between the second coefficient of thermal expansion and the coefficient of thermal expansion of glass. The electrical connector further includes a layer of a solder alloy having about 15% to 28% indium by weight, about 5% to 20% zinc by weight, about 1% to 6% silver by weight, and at least 36% tin by weight. The solder layer is disposed on at least a portion of the second layer.

Dependencies are inferred from the claim text.