Patent ID: 9723731
Date: 2017-08-01
CPC Classifications: H01L,H05K,Y02P

Claim:
1. A vehicular electronic device comprising: a semiconductor package having a plurality of power supply terminals and a signal terminal, wherein a power supply input function is assigned to each of the plural power supply terminals, and at least one of a signal input function and a signal output function is assigned to the signal terminal; and a multilayer wiring board having a first electrode pad through which each of the power supply terminals of the semiconductor package is mounted on and soldered to a mounting surface of the multilayer wiring board, and a second electrode pad through which the signal terminal is mounted on and soldered to the mounting surface, wherein the multilayer wiring board has a first wiring pattern in a layer above the mounting surface of the multilayer wiring board on which the first electrode pad is disposed, the first wiring pattern connecting to the first electrode pad, and a solder resist being disposed on the mounting surface of the multilayer wiring board, the second electrode pad has a second wiring pattern in a layer different from the layer above the mounting surface, the second electrode pad being disposed in an opening of the solder resist and apart from the solder resist, and the signal terminal of the semiconductor package is soldered to the second electrode pad of the multilayer wiring board so that a solder ball of the signal terminal covers and is in contact with an entire upper surface and an upper end of a side surface of the second electrode pad, and so that the solder ball of the signal terminal does not cover the solder resist disposed on the mounting surface of the multilayer wiring board.