Ni Ni Ni BALL Ni NUCLEAR BALL SOLDER JOINT FOAM SOLDER AND SOLDER PASTE

摘要

may be an impurity element other than the Ni content of not less than a predetermined amount less dose provides a high degree of Ni ball sphericity. And the content of U in order to reduce poor connection to suppress soft errors 5ppb or less, the content of Th is 5ppb or less, and the purity as 99.9% or less than 99.995%, and the dose below 0.0200cph / , any of the content of Pb or Bi, or, and the total content of the Pb and Bi with at least 1ppm, the sphericity was more than 0.90.