发明授权
US5649981A Tool and fixture for the removal of tab leads bonded to semiconductor
die pads
失效
用于去除接合到半导体管芯焊盘的接头引线的工具和夹具
- 专利标题: Tool and fixture for the removal of tab leads bonded to semiconductor die pads
- 专利标题(中): 用于去除接合到半导体管芯焊盘的接头引线的工具和夹具
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申请号: US706768申请日: 1996-09-23
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公开(公告)号: US5649981A公开(公告)日: 1997-07-22
- 发明人: Richard W. Arnold , Lloyd W. Darnell
- 申请人: Richard W. Arnold , Lloyd W. Darnell
- 申请人地址: TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: TX Dallas
- 主分类号: H01L23/58
- IPC分类号: H01L23/58 ; H01L21/68
摘要:
An apparatus for use in a removable tab procedure whereby tabs (7) are affixed to the pads (3) by initially having the bonding surface as flat as possible so that bonding pressures from pad to pad are relatively uniform. Bonding is preformed with the pressure applied to the pads being such that the tabs can later be easily removed without damage to the die pads, yet sufficiently strong so that the tabs do not come loose during burn in and testing. A bond strength pull between about 5 and about 40 grams per pad is appropriate for this purpose. The tabs are removed by placing the tested die (1) and attached tabs in a fixture (11) and providing a tool (31) dimensioned and moved along a path (13, 15, 17, 19) whereby each of the tabs is serially removed with the pressure applied to each tab to provide removal being preferably no greater than 40 grams. In this manner, since only one tab is removed at a time, there is no requirement that the extraction tool provide a great force to the die, thus minimizing the possibility of a greater than acceptable force being applied to any one tab for removal.
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