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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

why 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 datesheet

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    --- 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.