1Kbit SPI EEPROM in 8-TSSOP — parameter storage for industrial and mixed-voltage designs
The Microchip AT25010B-XHL-T is a 1Kbit serial EEPROM organized as 128 x 8 bits, accessed through an SPI interface at clock frequencies up to 20 MHz. The 8-TSSOP package (4.40 mm width) suits space-constrained boards where a smaller footprint than SOIC is preferred.
20 MHz SPI clock — bus timing margin for high-speed microcontrollers
The 20 MHz SPI clock rate allows the EEPROM to keep pace with modern MCU SPI peripherals without inserting wait states for most read operations. At 20 MHz, a 1-byte read completes in under 1 µs including overhead, which is adequate for calibration fetch or boot-parameter retrieval. The write cycle time of 5 ms per word or page is the limiting factor for bulk writes — plan firmware accordingly to avoid stalling the bus during page writes.
The wide supply range eliminates the need for a dedicated voltage regulator or level shifter when interfacing with 1.8V, 2.5V, 3.3V, or 5V logic. This simplifies the power tree and reduces BOM count in multi-voltage designs. The part draws its specified supply current from the same rail as the host MCU, which is a practical advantage for battery-powered or low-component-count boards.
Active lifecycle — no near-term end-of-life risk
ROHS3 compliance is confirmed.
Package and footprint — 8-TSSOP for dense layouts
This is a meaningful advantage when routing multiple serial memories or when board real estate is constrained.