The Microchip 93AA66AT-I/OT: A Robust 16Kb Serial EEPROM for Modern Designs

In the realm of embedded systems and IoT devices, the need for reliable, non-volatile memory for storing configuration data, calibration constants, and operational logs is paramount. The Microchip 93AA66AT-I/OT stands out as a premier solution, offering designers a robust and versatile 16Kbit (1024 x 16 or 2048 x 8) Serial Electrically Erasable PROM (EEPROM) in a space-saving SOT-23 package.

This memory chip is renowned for its low-power operation, making it an ideal candidate for battery-powered and portable applications. It features a standby current of just 1 µA (max) and an active current of 1 mA (max), ensuring minimal drain on power resources. Its wide voltage range from 1.8V to 5.5V provides exceptional design flexibility, allowing it to interface seamlessly with a vast array of microcontrollers and processors, from low-voltage modern chips to legacy 5V systems.

Communication is handled via a simple and efficient 3-wire serial interface (Clock, Data In, and Data Out), which reduces the number of GPIO pins required on the host microcontroller. This interface supports both Microwire and a subset of SPI protocols, offering compatibility with numerous development platforms. The device also includes crucial hardware data protection through a Write-Protect (WP) pin, enabling the host system to prevent accidental writes to the memory array, thereby safeguarding critical data.

Engineers will appreciate its high reliability and endurance, rated for 1 million erase/write cycles and data retention of 200 years. These specifications ensure data integrity over the entire lifespan of even the most demanding applications, from industrial automation and automotive systems to medical devices and consumer electronics. The 93AA66AT-I/OT is specified over the extended industrial temperature range (-40°C to +85°C), guaranteeing stable performance in harsh environmental conditions.

ICGOODFIND: The Microchip 93AA66AT-I/OT encapsulates a perfect balance of density, power efficiency, and physical size. Its proven reliability, simple interface, and hardware write protection make it a superior choice for designers seeking to add robust non-volatile memory to their designs without compromising on board space or power budgets.

Keywords: Serial EEPROM, Low-Power, Non-Volatile Memory, Microwire Interface, Write Protection.