Ag BALL, Ag CORE BALL, FLUX-COATED Ag BALL, FLUX-COATED Ag CORE BALL, SOLDER JOINT, FORMED SOLDER, SOLDER PASTE AND Ag PASTE

摘要

Providing an Ag ball having a low alpha dose and a high sphericity regardless of impurity elements having an amount equal to or more than a predetermined value except for Ag. In order to suppress a soft error and reduce an connection fault, a content of U is equal to or less than 5 ppb, a content of Th is equal to or less than 5 ppb, a purity is equal to or more than 99.9% but equal to or less than 99.9995%, an alpha dose is equal to or less than 0.0200 cph/cm2, a content of either Pb or Bi or a total content of both Pb and Bi is equal to or more than 1 ppm, and a sphericity is equal to or more than 0.90.

主权项

1: An Ag ball, comprising:
an element U, a content thereof being equal to or less than 5 ppb; and an element Th, a content thereof being equal to or less than 5 ppb; wherein a purity of said Ag ball is equal to or more than 99.9% but equal to or less than 99.9995%; an alpha dose of said Ag ball is equal to or less than 0.0200 cph/cm2; a content of either Pb or Bi or a total content of both Pb and Bi is equal to or more than 1 ppm; and a sphericity of said Ag ball is equal to or more than 0.90.