发明申请
- 专利标题: SEMICONDUCTOR PACKAGE WITH LEAD INTRUSIONS
- 专利标题(中): 半导体封装与引线插入
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申请号: US12104182申请日: 2008-04-16
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公开(公告)号: US20090261461A1公开(公告)日: 2009-10-22
- 发明人: Steven Sapp , Chung-Lin Wu , Maria Christina B. Estacio , Bigildis Dosdos , Hamza Yilmaz
- 申请人: Steven Sapp , Chung-Lin Wu , Maria Christina B. Estacio , Bigildis Dosdos , Hamza Yilmaz
- 主分类号: H01L23/495
- IPC分类号: H01L23/495 ; H01L21/60
摘要:
Semiconductor packages comprising a plurality of lead fingers containing a lead intrusion at the edge of the lead fingers are described. The semiconductor packages comprise an integrated circuit chip that is connected to a die pad and is electrically connected to multiple lead fingers. One or more of the lead fingers may have a lead intrusion disposed on the external exposed lower surface of the lead finger. The lead intrusion may have a height that is about ⅕ to about ½ the height of a lead finger, a width that is about ⅕ to about 1/2 the width of a lead finger, and a depth that is about ¼ to about ¾ the length of the externally exposed lower surface of a lead finger. The lead intrusion increases the area on the lead finger that contacts a bond material, such as solder, and therefore increase the strength of the joint between the semiconductor package and an external surface to which the lead finger is connected (i.e., a PCB). The lead intrusion allows out gassing during reflow of the bond material which may reduce voiding. The lead intrusion can also increase bond joint reliability by providing longer crack propagation length.
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