Forum Discussion

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_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.