Patent ID: 9699891
Date: 2017-07-04
CPC Classifications: H01L,H05K

Claim:
1. A substrate comprising: a join-structure including a semiconductor package, first electrode pad, bump, second electrode pad, and circuit substrate joined in the order named; and a first wire and a second wire formed in a region below a corner of the semiconductor package, each of the first wire and the second wire having a low-strength structure, wherein: one of the first wire and the second wire is connected to the first electrode pad or the second electrode pad, and the one of the first wire and the second wire is connected to a bump and a first measurement circuit for measuring a connection, the other of the first wire and the second wire is not connected to any of the first electrode pad and the second electrode pad and the other of the first wire and the second wire is connected to a circuit substrate and a second measurement circuit that measures another connection across the other of the first wire and the second wire, and a break strength of each of the first wire and the second wire is lower than a break strength of the join-structure between the circuit substrate and the semiconductor package.