Method of increasing reliability of packaged semiconductor...

Details Method of increasing reliability of packaged semiconductor... Method of increasing reliability of packaged semiconductor...

2006-09-12

2006-09-12

Pert, Evan (Department: 2829)

Semiconductor device manufacturing: process

Including control responsive to sensed condition

Electrical characteristic sensed

C438S017000

Reexamination Certificate

active

07105364

ABSTRACT:
Semiconductor dice are electrically tested prior to final assembly. Dice failing the test are identified and not packaged. However, “good dice” (i.e., those dice that passed testing) in proximity to the failed dice frequently fail prematurely in the field. Therefore, in one embodiment, a method to identify those dice having a probability for early failure includes identifying a core die and a die cluster, adding the core die and at least one additional die from the die cluster to a weighted character map, and assigning a weighting value to each of the dice added to the weighted character map. At least one tier of buffer dice is then added to the weighted character map adjacent to each die on the weighted character map. Both the dice from the die cluster and the tier of buffer dice are marked, thereby preventing those dice from being packaged and consequently, shipped to customers.

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patent: 6714885 (2004-03-01), Lee
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patent: 2002/0156550 (2002-10-01), Langford
patent: 2003/0061212 (2003-03-01), Smith et al.

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