Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Solder wettable contact – lead – or bond
Patent
1998-04-28
1999-02-09
Saadat, Mahshid D.
Active solid-state devices (e.g., transistors, solid-state diode
Combined with electrical contact or lead
Solder wettable contact, lead, or bond
257780, 257778, 257782, 257787, H01L 2348, H01L 2352, H01L 2940
Patent
active
058699040
ABSTRACT:
A semiconductor device comprises a plurality of solder bumps each formed on a pad of a semiconductor device. The top of each of the solder bumps is covered with a masking film, and the bases of the solder bumps are buried with a reinforcement film. The oxidation of the solder bumps is prevented by the masking film and the reinforcement film, the latter also undertaking the thermal stress generated between the semiconductor chip and the circuit board. The mounting is conducted with the masking film remaining on the top of the solder ball, which breaks the masking film and connected to the pad on the circuit board.
REFERENCES:
patent: 5641996 (1997-06-01), Omoya et al.
patent: 5764485 (1998-06-01), Lebaschi
patent: 5773888 (1998-06-01), Hosomi et al.
Clark S. V.
NEC Corporation
Saadat Mahshid D.
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