Ag BALL, Ag CORE BALL, FLUX COAT Ag BALL, FLUX COAT Ag CORE BALL, SOLDER JOINT, FOAM SOLDER, SOLDER PASTE, Ag PASTE AND Ag CORE PASTE

摘要

PROBLEM TO BE SOLVED: To provide an Ag ball less in ray amount and high in sphericity even containing an excessive quantity of impurity element other than Ag.SOLUTION: There is provided an Ag ball having the content of U for reducing connection failure by preventing soft errors of 5 ppb or less, the content of Th of 5 ppb or less, purity of 99.9 to 99.9995%, ray amount of 0.0200 cph/cmor less, the content of any of Pb or Bi and the total content of Pb and Bi of 1 ppm or more, sphericity of 0.90 or more and diameter of 1 to 1000 m.