What this 2Kbit I²C EEPROM brings to a mixed-voltage BOM
The Microchip 34AA02T-I/MNY is a 2Kbit serial EEPROM with an I²C interface running at 400 kHz, organized as 256 x 8 bits. The 1.7V to 5.5V supply range is its standout feature — it lets you drop the same part into a 1.8V MCU rail, a 3.3V sensor bus, or a legacy 5V logic design without a separate level translator. The 8-TDFN package (2x3 mm footprint) saves board area for space-constrained IoT or portable gear.
Industrial temperature and active lifecycle — no obsolescence worry
The lifecycle status is Active, meaning Microchip still manufactures it for new designs — no last-time-buy scramble. ROHS3 compliant, so it passes EU material restrictions as shipped.
Write-cycle timing and bus-speed limits
Word and page writes take 5 ms; the page-write buffer lets you load up to 8 bytes in one I²C burst before the internal programming cycle starts. The 400 kHz clock limit means this part runs on Fast-mode (400 kHz) buses, not High-speed (1 MHz). If your bus master already runs at 400 kHz, the 900 ns access time is well within the setup-and-hold margins for a 2.5 µs clock period. For 1 MHz buses you would need a different EEPROM — the 24AA02 family from Microchip does not support 1 MHz either.
Packaging and tape/reel logistics
The 8-TDFN (2x3 mm) body is a leadless package with an exposed pad on the bottom — the pad is not electrically connected internally, but soldering it to a PCB ground plane improves thermal conduction.