24AA128T-I/ST

Memory IC Overview

The 24AA128T-I/ST is a 16K x 8 (128 Kbit) Serial Electrically Erasable PROM manufactured by Microchip Technology. It operates on a single supply voltage ranging from 1.7V to 5.5V and features an I2C compatible two-wire serial interface with a maximum clock frequency of 400 kHz at voltages above 2.5V, or 100 kHz below 2.5V. The device utilizes low-power CMOS technology, drawing a maximum write current of 3 mA and standby current of 1 µA in industrial temperature conditions (-40°C to +85°C). It includes a 64-byte page write buffer, hardware write-protect capability via the WP pin, and supports cascading up to eight devices on the same bus.

Memory IC Feature Summary

• Supports bidirectional data transmission using an I2C compatible two-wire serial protocol.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Includes a 64-byte page write buffer for efficient sequential data writing operations.
• Provides hardware write protection through the WP pin to inhibit array writes when tied high.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage.
• Data acquisition applications needing reliable parameter retention.
• Industrial control systems operating within specified voltage and temperature ranges.

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and '/ST' indicates the 8-Lead TSSOP package. Confirm the 'T' suffix denotes tape and reel packaging if required for automated assembly. Ensure the specific revision level matches the design requirements, as datasheet revisions may update electrical characteristics or pin descriptions.

Memory IC Selection Notes

Select this component for designs requiring low-voltage operation down to 1.7V and standard I2C compatibility. Consider the 24LC128 variant if the system voltage remains strictly above 2.5V, or the 24FC128 if higher speed operation up to 1 MHz is necessary. Evaluate the need for hardware write protection and the specific package constraints of the 8-Lead TSSOP form factor during PCB layout.

Memory IC Part Context

This device belongs to the 24XX128 family of 128K-bit I2C Serial EEPROMs, which also includes the 24LC128 and 24FC128 models. These parts share identical memory organization and functional interfaces but differ in voltage ranges and maximum clock frequencies. The 24AA128 specifically targets broad voltage applications starting at 1.7V, distinguishing it from the 2.5V minimum 24LC128.

Memory IC Replacement Considerations

Direct functional substitutes within the same package include the 24LC128-I/ST and 24FC128-I/ST, provided voltage and speed requirements are met. Cross-vendor equivalents such as the AT24C128C should be verified for pinout and timing compatibility before substitution.