24C EEPROM, looks like Microchip's standard 350 nm 3-metal process.
IBIS model: “Manufactured on Microchip's 160K process”
Package
8-pin SOIC.
Markings:
24LC256I SN (e3) 1115 (Microchip logo) K7U
Die
Size is approximately 1760 x 1830 μm (3.22 mm2)
Mask revision markings. Interestingly, not all in the same spot on the die.
Logo and die ID.
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