# Can somebody identify this 12" silicon wafer?

I just bought a silicon wafer off of eBay to decorate my office. The seller didn't tell/know, but I'm dead curious as to what this wafer is. Could anyone help me identify which chips should have been built out of it?

### Full picture

Here's a picture of the entire 12" wafer.

### Poor man's macro

Here's a zoomed-in picture of the lighter rectangles that are scattered over this wafer. I took it using a super cheap magnifying glass.

### Another poor man's macro

Here's another angle trying to show both the light and dark rectangles. Unfortunately I only have a smallish magnifying glass so I can't see any better.

### Extra info

• This is a 300 mm wafer
• I couldn't find any marking on the front side
• The backside has a serial number (K444R215WFB3) and a QR code that's so small I couldn't decipher it.
• The dark rectangles probably have something drawn in them, but it's impossible to see it even with a magnifying glass.
• Are there no other markings of any kind, on either side? – BeB00 Aug 26 at 19:06
• Smells like it has excess faults for some large BGA – Tony Stewart Sunnyskyguy EE75 Aug 26 at 19:09
• An image of one of the dark rectangles is likely to be more helpful than one of the light rectangles. Best if you can get enough magnification to see any metal layer markings. – The Photon Aug 26 at 19:26
• Get it under strong enough magnification and you may find a copyright or brand marking on it. But it'd be super-small. Basically, if you can see individual transistors -- start looking for human-readable markings. – TimWescott Aug 26 at 20:32