The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2017
Filed:
Nov. 18, 2013
Senju Metal Industry Co., Ltd., Tokyo, JP;
Koji Watanabe, Tochigi-ken, JP;
Minoru Toyoda, Tochigi-ken, JP;
Satoshi Tomita, Tochigi-ken, JP;
Tsutomu Sugino, Tochigi-ken, JP;
Daichi Kikuchi, Tochigi-ken, JP;
Hiroki Oshima, Tochigi-ken, JP;
Senju Metal Industry Co., Ltd., Tokyo, JP;
Abstract
When soldering a package having an electrode on which Ni/Au or Ag—Pd alloy is plated, to a printed circuit board having a Cu electrode or an electrode on which Cu is plated, a solid-phase diffusion layer is formed within a layered solder material for bonding different species of electrodes. The layered solder material is composed of a solder material of Sn—Ag—Cu series or Sn—Sb series and a solder material of Sn—Ag—Cu—Ni series or Sn—Pb series. The electrode on which Ni/Au or Ag—Pd alloy is plated and the Cu electrode or the electrode on which Cu is plated are soldered with the solder material of Sn—Ag—Cu series or Sn—Sb series being attached to the Cu electrode and the solder material of Sn—Ag—Cu—Ni series or Sn—Cu series being attached to the electrode on which Ni/Au or Ag—Pd alloy is plated. This restrains formation of intermetallic compounds and provides high bonding reliability.