4 ms·
X-ray inspection is usually only looking for solder bridges and voids. You aren't really looking at dies unless you have a really good x-ray and actually are co
by moftz 7y ago
X-ray inspection is usually only looking for solder bridges and voids. You aren't really looking at dies unless you have a really good x-ray and actually are concerned about the integrity of the chip. Counterfeit parts end up in designs all the time. They could be knockoff versions that still work or just random parts relabeled. Even these are really only x-rayed as a last resort.
- sephamorr 7y agoI use very good PCB inspection xrays and ct scanners, and it is critical to use energy levels which do not resolve the silicon, e.g. are not absorbed by the die. Otherwise, it is frustratingly easy to give the part a total ionizing dose which breaks it. I wouldn't want to use an xray to do more than verify the die is the same shape and has the same wirebond layout.