4Kbit I²C EEPROM in an 8-TSSOP — what this part does
The Microchip AT24C04C-XHM-T is a 4Kbit serial EEPROM organized as 512 x 8 bits, accessed through an I²C interface running up to 1 MHz. It stores configuration data, calibration constants, or small firmware parameters that need non-volatile retention across power cycles.
Rated from 1.7V to 5.5V, this part covers the common digital logic rails without extra regulation. If your assembly sees sustained 105°C ambient, this grade won't cover it — the part is specced for 85°C ambient, not junction.
Access time and write cycle — timing on the bus
At 550 ns access time, the AT24C04C-XHM-T keeps up with a 1 MHz I²C clock without stretching the SCL line on reads. The 5 ms write cycle time per word or page means a firmware update writing 64 bytes in page mode takes about 80 ms — budget that into your power-down sequence if you're writing before sleep.
Package — 8-TSSOP, tape and reel
Housed in an 8-TSSOP (4.40 mm wide body), this is a surface-mount part for automated assembly. The footprint matches the industry-standard 8-pin TSSOP layout, so a board already routed for a 24C-series EEPROM in this package should accept it without a layout change.
The base product number AT24C04 covers a family of 4Kbit I²C EEPROMs in various packages and temperature grades — the -C revision is the current silicon.