Patent ID: 11890702
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC B  C  H | IPC B  C

Claim 0:
1. A solder joint comprising:
a solder joint layer having a melted solder material containing Sn as a main component and further containing Ag and/or Sb and/or Cu; and
a joined body including a Ni—P—Cu plating layer on a surface in contact with the solder joint layer, wherein
the Ni—P—Cu plating layer contains Ni as a main component and contains 0.5% by mass or greater and 8% by mass or less of Cu and 3% by mass or greater and 10% by mass or less of P,
the Ni—P—Cu plating layer has a microcrystalline layer at an interface with the solder joint layer, and the microcrystalline layer includes a phase containing microcrystals of a NiCuP ternary alloy, a phase containing microcrystals of (Ni,Cu)3P, and a phase containing microcrystals of Ni3P.