The Microchip AT24CS08-XHM-T is an 8-Kbit serial EEPROM with an I2C interface running up to 1 MHz. Organized as 1K x 8 bits, it stores calibration constants, configuration parameters, or small firmware patches that need non-volatile retention across power cycles. The 8-TSSOP package (4.40 mm wide) fits tight PCB real estate on sensor modules, industrial control boards, and portable instruments.
1 MHz I2C and 550 ns access time — bus timing reality
At 1 MHz clock (Fast-mode Plus), the AT24CS08-XHM-T delivers a 550 ns access time from the stop condition to the first data byte. That latency matters when a microcontroller polls the part during a tight control loop — the bus must be idle for at least 550 ns before the read data is valid. For most applications the 5 ms write cycle time (page or byte) is the throughput bottleneck, not the read access.
Microchip lists the AT24CS08-XHM-T as Active.
Second-source and cross-grade options
The closest pin-compatible sibling is the AT24CS08-MAHM-E, which shares the same 8-Kbit frame, 550 ns access time, 1 MHz I2C, and 1.7 V–5.5 V supply, but ships in a different tape-and-reel variant (MAHM-E suffix). For designs needing 16 Kbit capacity, the AT24C16D-MAHM-E doubles the memory (2K x 8) with a slightly faster 450 ns access time, same 1 MHz clock and supply range, though in a different package footprint. The AT24C08C-XHM-B offers the same 8-Kbit density in a tube package — useful for prototype runs where reel quantities are excessive.