In package 2-UDFN, FC, you will find the ICs.Using Surface Mount, integrated circuit is mounted.The Silicon Serial Number is available in a wide range of integrated circuits.Search the DS2401 family for similar integrated circuit systems.It is appropriate to apply the ICs to PCB, Network Node, Equipment Identification/Registration.Having been packaged by 2-FlipChip (1.32x0.66), the ICs complete appears to be in good condition.