Joined: 31 Jan 2026
Posts: 21
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| Posted: Tue Jan 24, 2026 3:38 pm Post subject: Re: how to judge a good diced wafer |
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| kivio wrote: | | if we were given a dicied wafer which has went thru dicing process.(before mounting), how to judge whether the diced wafer is a good wafer or not?? |
The question is confusing. Do you mean if the quality of sawing is ok or if the wafer sawn is composed of good dice?
If the former, I think the best way is to flip the wafer ring to check the bootom of the wafer tape. If there are Si remnants on the sawing street/kerf, the quality of sawing may not be good. You might want to get the edge dice out of the tape and inspect the sides as well.
If the latter, then the best way is to ask the one who gave you the wafer (your customer maybe). Now, you may never know if uninked wafer are dummies. Some years back when Wafer Map process is not yet developed, it is easy to check for bad/dummy wafers. Usually uninked wafers are dummy. |
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