Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Flip chip
Patent
1997-12-02
1998-11-10
Saadat, Mahshid D.
Active solid-state devices (e.g., transistors, solid-state diode
Combined with electrical contact or lead
Flip chip
257780, H01L 2348, H01L 2352, H01L 2940
Patent
active
058348484
ABSTRACT:
The electronic device has a structure that a semiconductor package (10) is mounted on a motherboard (21), and a buffer layer (41) for relieving a stress, which is produced due to a difference of physical properties between the semiconductor package (10) and the motherboard (21), is mounted on the electrical and mechanical interface between the semiconductor package (10) and the motherboard (21). For example, the buffer layer (41) having a thermal expansion coefficient close to that of the motherboard (21) is formed on a face of the semiconductor package 10 having an external connecting terminals (12b) mounted. A stress caused due to a difference between a thermal expansion coefficient of a wiring substrate (12) of the semiconductor package and that of the motherboard (21) can be relieved by the buffer layer (41). Therefore, a cyclic stress applied to the connection between the semiconductor package and the motherboard in the actual application environment can be relieved, and reliability of connection can be improved. Thus, a semiconductor package mountable with a high degree of reliability and an electronic device having a high degree of reliability is provided.
REFERENCES:
patent: 5473512 (1995-12-01), Degani et al.
patent: 5640051 (1997-06-01), Tomura et al.
patent: 5729440 (1998-03-01), Jimarez et al.
patent: 5731630 (1998-03-01), Suyama et al.
Clark S. V.
Kabushiki Kaisha Toshiba
Saadat Mahshid D.
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