TRANSMISSION CONTROL DEVICE AND ELECTRONIC CIRCUIT DEVICE

摘要

It is difficult to dissipate heat generated from a bare chip. In addition, if a bare chip is covered with a sealing resin in such a manner that a heat sink is exposed so as to facilitate heat dissipation, problems such as separation and cracking occur. An electronic circuit device comprises: an electronic circuit assembly for controlling a car transmission and a car brake; a base for fixing the electronic circuit assembly; and a lead terminal for electrically connecting the electronic circuit assembly, wherein the electronic circuit assembly, the base, and the lead terminal are sealed with a mold resin. The electronic circuit device has a heat dissipation structure characterized in that an opening is formed under a heat-emission circuit device (bare chip) through a circuit board and the base and both sides of a heat-emission device are thermally connected to a sealing resin.