The Microchip 24AA00T-I/OT is a 128-bit serial EEPROM organized as 16 x 8 bits, communicating over an I²C bus at up to 400 kHz. Its 128-bit capacity is a fraction of a typical EEPROM — think one-time calibration constants, serial numbers, or a few configuration bytes where a larger memory would be overkill.
3500 ns access time — the bus timing reality
The 3500 ns access time is the read-cycle time for a byte over the I²C bus. At 400 kHz the bus clock period is 2500 ns, so the access time doesn't limit throughput — the bus protocol overhead does. For a 16-byte read, total transfer time is under a millisecond. This part is not for streaming data; it is for infrequent reads of small payloads.
The ROHS3 compliance is current.
SOT-23-5 package — footprint and storage
The SOT-23-5 (SC-74A) package is a common 5-pin surface-mount footprint. The tape-and-reel variant (T suffix) ships on 7-inch reels; cut-tape options are also available. Store reels in a dry cabinet below 30°C / 60% RH to be safe.