The Microchip 25LC010AT-I/OT: A Compact 1-Mbit SPI EEPROM Solution

In the realm of embedded systems and IoT devices, the need for reliable, non-volatile memory for data storage and configuration parameters is paramount. The Microchip 25LC010AT-I/OT stands out as a robust and highly efficient solution, offering 1 Megabit (128 KByte) of serial EEPROM memory in an extremely space-conscious package. This device is engineered for applications where board space is at a premium and low-power operation is critical.

A key feature of this memory chip is its industry-standard SPI serial interface (Serial Peripheral Interface), which facilitates simple communication with a host microcontroller (MCU). This interface requires only four signals—Serial Clock (SCK), Serial Data In (SI), Serial Data Out (SO), and Chip Select (CS)—enabling a significantly reduced pin count compared to parallel memory alternatives. This simplifies PCB layout and minimizes the number of GPIOs required on the MCU, making it an ideal choice for compact designs.

The 25LC010AT-I/OT supports a wide voltage range from 1.8V to 5.5V, ensuring compatibility with a vast array of modern microcontrollers operating at both 3.3V and 5V levels. Its low-power characteristics are exceptional, featuring a standby current of only 1 µA (typical) and an active read current of 3 mA (max at 5.5V), which is crucial for battery-powered and energy-harvesting applications.

Beyond its core storage function, this EEPROM integrates several advanced hardware and software features that enhance system integrity. It includes built-in hardware write-protection via a dedicated ~WP pin, safeguarding critical memory sections from accidental overwrites. Furthermore, the device offers sequential read operation for faster data throughput and a resilient self-timed write cycle with a maximum duration of 5 ms, which eliminates the need for the MCU to manage programming timing.

Organized as 128 blocks of 16 bytes each, it provides flexible page (16 bytes) and sector erase capabilities. With an endurance of over 1 million erase/write cycles and a data retention period exceeding 200 years, it guarantees long-term reliability for storing mission-critical data. Its operational temperature range of -40°C to +85°C makes it suitable for industrial and automotive environments.

ICGOODFIND: The Microchip 25LC010AT-I/OT is a superior choice for designers seeking a high-density, low-power, and highly reliable serial EEPROM. Its combination of a tiny SOT-23-6 package, simple SPI interface, and robust feature set makes it an indispensable component for modern electronic designs across consumer, industrial, and automotive markets.

Keywords: SPI Interface, Serial EEPROM, Non-volatile Memory, Low-power, Hardware Write-protection.