作者: Noriaki Sakamoto , Sadamichi Takakusaki
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摘要: In a hybrid integrated circuit device that is of the present invention, conductive pattern including pads formed on surface substrate. A first pad to be relatively large since heat sink mounted thereon. second small which chip component or signal transistor fixed. plated film made nickel pad. Therefore, and solder never come into contact with each other. Thus, Cu/Sn alloy layer having poor soldering properties not generated but Ni/Sn excellent generated. Consequently, occurrence in melted suppressed.