“The APV25 is the readout chip for silicon microstrips in the CMS tracker. It is the first major chip for a high energy physics experiment to exploit a modern commercial 0.25μm CMOS technology.”

https://cds.cern.ch/record/478270/files/raymond.pdf

Many thanks to cpresser for providing this sample!

Package

LPGBTX V0

Die

APV25-S1
(C) 2000 RAL-IC-CERN *M*