24AA128T-I/MS

Memory IC Overview

The Microchip Technology 24AA128T-I/MS is a 128 Kbit (16K x 8) Serial Electrically Erasable PROM (EEPROM) utilizing I2C compatible two-wire serial interface. It operates on a single supply voltage ranging from 1.7V to 5.5V with an industrial temperature range of -40°C to +85°C. The device supports clock frequencies up to 400 kHz at voltages above 2.5V and 100 kHz below 2.5V. Key electrical characteristics include a maximum write current of 3 mA, standby current of 1 µA, and ESD protection exceeding 4,000V. It features a 64-byte page write buffer, hardware write-protect capability, and endurance of over one million erase/write cycles.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using configurable chip address inputs for expanded address space.
• Includes Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Features hardware write-protect functionality via the WP pin to inhibit write operations while maintaining read access.
• Utilizes self-timed erase/write cycles with automatic acknowledge polling capabilities to maximize bus throughput.

Memory IC Applications

• Personal communications devices requiring low-power non-volatile data storage
• Data acquisition systems needing reliable parameter retention
• Embedded systems utilizing I2C bus architecture for configuration memory

Memory IC Procurement Notes

Verify that the ordering suffix 'I' confirms the Industrial temperature grade (-40°C to +85°C) and '/MS' denotes the 8-Lead MSOP package. Confirm the base part number corresponds to the 24AA128 variant, which specifies the 1.7V minimum operating voltage, distinct from the 2.5V requirement of the 24LC128 series. Ensure compatibility with system voltage levels before integration.

Memory IC Selection Notes

Select this component when operation below 2.5V is required, as it supports down to 1.7V unlike the 24LC128. Choose the MSOP package for compact surface-mount designs where A0 and A1 pins are not connected, limiting bus expansion to two devices. Verify that the 400 kHz clock speed meets system timing requirements at the specific operating voltage.

Memory IC Part Context

This part belongs to the 24XX128 family of 128 Kbit I2C Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 24LC128 and 24FC128 but differs in voltage ranges and clock speeds. The 24AA128 specifically targets applications requiring lower voltage operation compared to the standard 2.5V minimum of the LC series.

Memory IC Replacement Considerations

The 24LC128 serves as a functional substitute if the application voltage remains above 2.5V, though it lacks 1.7V support. The 24FC128 offers higher clock speeds up to 1 MHz but requires similar voltage considerations. Verify package pinout compatibility, noting that MSOP variants have unconnected A0/A1 pins affecting addressing schemes.