Invention Grant
- Patent Title: Dye and pry process for removing quad flat no-lead packages and bottom termination components
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Application No.: US16255211Application Date: 2019-01-23
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Publication No.: US10593601B2Publication Date: 2020-03-17
- Inventor: Tim A. Bartsch , Jennifer Bennett , James D. Bielick , David J. Braun , John R. Dangler , Stephen M. Hugo , Theron L. Lewis , Timothy P. Younger
- Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Applicant Address: US NY Armonk
- Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Current Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Current Assignee Address: US NY Armonk
- Agency: Cantor Coburn LLP
- Agent Tihon Poltavets
- Main IPC: H01L21/66
- IPC: H01L21/66 ; G01N21/95 ; H01L21/48 ; H01L23/00 ; G01N21/91 ; H05K3/34 ; H01L23/495 ; G01N21/956

Abstract:
Embodiments of the invention include a dye and pry process for removing quad flat no-lead (QFN) packages and bottom termination components (BTC) from card assemblies. Aspects of the invention include immersing a semiconductor package assembly in a solution comprising dye and placing the immersed semiconductor package assembly under vacuum pressure. Vacuum conditions ensure that the dye solution is pulled into any cracks in the solder formed between the semiconductor package assembly and the QFN package or BTC. The package assembly is dried and a hole is drilled to expose a bottom surface of the QFN package or BTC. The QFN package or BTC is then removed by applying a force to the exposed bottom surface. The semiconductor package assembly can then be inspected for the dye to locate cracks.
Public/Granted literature
- US20190157169A1 DYE AND PRY PROCESS FOR REMOVING QUAD FLAT NO-LEAD PACKAGES AND BOTTOM TERMINATION COMPONENTS Public/Granted day:2019-05-23
Information query
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