| abstract |
A transition layer 38 is provided on a die pad 22 of an IC chip 20 and integrated into a multilayer printed circuit board 10 . Due to this, it is possible to electrically connect the IC chip 20 to the multilayer printed circuit board 10 without using lead members and a sealing resin. Also, by providing the transition layer 38 made of copper on an aluminum pad 24 , it is possible to prevent a resin residue on the pad 24 and to improve connection characteristics between the die pad 24 and a via hole 60 and reliability. |