Invention Grant
- Patent Title: Process for forming cone shaped solder for chip interconnection
- Patent Title (中): 用于形成用于芯片互连的锥形焊料的工艺
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Application No.: US09233383Application Date: 1999-01-19
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Publication No.: US06184062B2Publication Date: 2001-02-06
- Inventor: Peter Jeffrey Brofman , Shaji Farooq , John U. Knickerbocker , Scott Ira Langenthal , Sudipta Kumar Ray , Kathleen Ann Stalter
- Applicant: Peter Jeffrey Brofman , Shaji Farooq , John U. Knickerbocker , Scott Ira Langenthal , Sudipta Kumar Ray , Kathleen Ann Stalter
- Main IPC: H01L2144
- IPC: H01L2144

Abstract:
A method of forming non-spherically shaped solder interconnects, preferably conical, for attachment of electronic components in an electronic module. Preferably, the solder interconnects of the present invention are cone shaped and comprise of depositing a first solder followed by a second solder having a lower reflow temperature than the first solder. Warm placement of the electronic component at a somewhat elevated temperature than room temperature but less than the solder reflow temperature reduces the force required during placement of a semiconductor chip to a substrate. After warm placement, reflow of the module occurs at the lower reflow temperature of the second solder. The conical shape of the solder interconnects are formed by a heated coining die which may also coin a portion of the interconnects with flat surfaces for stand-offs. The ability of the cone shaped solder interconnects to meet the opposing surface of a chip or substrate at different heights accommodates the camber typically associated with chip and substrate surfaces.
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