Forum Discussion
Altera_Forum
Honored Contributor
Honored Contributorwhy these x-ray photos are different?
https://www.alteraforum.com/forum/attachment.php?attachmentid=4358
https://www.alteraforum.com/forum/attachment.php?attachmentid=4359 I have two part to compare with Top one is came from Altera japan disty last year the other one is came from Altera broker this year the broker part was all factroy sealed pkg and label and other condition was all good but we just got x-ray photos as follow https://www.alteraforum.com/forum/attachment.php?attachmentid=4360 https://www.alteraforum.com/forum/attachment.php?attachmentid=4361 and we don't understand why these two parts are different in x-ray i can't find any explaination about the x-ray image in datesheet2 Replies
Altera_ForumGood eyes. The G marking indicates a die shrunk 60nm part, reduction from 6 to 4 layer substrate, and transition from gold to copper interconnect.
http://www.altera.com/literature/pcn/pcn0904.pdf- Altera_Forum--- Quote Start --- i can't find any explaination about the x-ray image in datesheet --- Quote End --- Honestly, I won't expect it. --- Quote Start --- we don't understand why these two parts are different in x-ray --- Quote End --- Assuming the exposition conditions are exactly the same (are they?), I would consider a different copper weight of the chip carrier PCB ground plane.
