2 Kbit I2C EEPROM in a SOT-23-6 — calibration-store or serial-ID page
The Microchip 34LC02T-I/OT is a 2 Kbit serial EEPROM organized as 256 x 8 bits, accessed through an I2C interface running at up to 1 MHz. The 400 ns access time is the random-read cycle — fast enough for a configuration or calibration parameter fetch on a shared bus without stalling the master.
1 MHz I2C bus — timing margin on a shared line
At 1 MHz the part runs in fast-mode-plus territory. That clock rate gives headroom when the bus also carries a higher-speed sensor or ADC — the EEPROM read does not force the master to drop to 400 kHz. The 5 ms write-cycle time for a page or word is the limiting factor during a firmware-parameter update; the bus is tied up for that window, so plan the write sequence around time-critical sensor reads.
SOT-23-6 footprint — board-area trade-off
The SOT-23-6 package (supplier device package SOT-23-6) saves about 60% board area versus an SOIC-8. That matters when the EEPROM is a secondary device — calibration constants, serial number, or manufacturing data — on a dense mixed-signal board. The trade-off: hand-solder rework is fiddly, and the small body limits the number of decoupling-capacitor placement options near the supply pin. Surface-mount only, no through-hole variant.
For dual-sourcing resilience, the 24LC025T-I/ST is a 2 Kbit I2C EEPROM in a different package (TSSOP-8) with a 900 ns access time and 400 kHz max clock — a functional alternate if the board can accommodate the larger footprint and slower bus speed.