24LC128T-E/ST

Memory IC Overview

The Microchip Technology 24LC128T-E/ST is a 16K x 8 (128 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates with a single supply voltage ranging from 2.5V to 5.5V and supports I2C compatible two-wire serial interface communication at clock frequencies up to 400 kHz. The device features a 64-byte page write buffer, hardware write-protect capability, and Schmitt trigger inputs for noise suppression. It is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP) and is rated for extended industrial temperature operation from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using functional address lines A0, A1, and A2.
• Includes hardware write-protect functionality via the WP pin to inhibit write operations when tied to VCC.
• Features output slope control designed to eliminate ground bounce during data transmission.

Memory IC Applications

• Personal communications systems requiring low-power non-volatile storage
• Data acquisition applications needing reliable parameter retention
• Industrial control systems operating within extended temperature ranges

Memory IC Procurement Notes

Verify that the ordering suffix 'E' confirms the Extended temperature range (-40°C to +125°C) and the 'ST' designation specifies the 8-lead TSSOP package. Confirm the 'T' indicates tape-and-reel packaging if required for automated assembly. Ensure the specific revision matches the datasheet DS20001191T for accurate electrical characteristics.

Memory IC Selection Notes

Select this component when an I2C interface is required with a minimum operating voltage of 2.5V. The Extended temperature grade is necessary for environments exceeding standard industrial limits. The TSSOP package is suitable for surface-mount applications requiring a compact footprint. Verify that the 400 kHz maximum clock frequency meets system timing requirements.

Memory IC Part Context

This part belongs to the 24XX128 family, which includes the 24AA128 and 24FC128 variants. While sharing identical memory architecture and interface protocols, the 24LC128 is distinguished by its 2.5V minimum operating voltage requirement compared to the 1.7V capability of the 24AA128 and 24FC128.

Memory IC Replacement Considerations

The 24LC128-I/ST serves as the Industrial temperature grade equivalent. The 24AA128T-E/ST and 24FC128T-E/ST are functionally compatible but support lower voltage operation down to 1.7V.

Memory IC FAQ

How many devices can be connected to a single I2C bus?

Up to eight 24LC128 devices can be connected to the same bus by configuring the chip select bits A0, A1, and A2 differently.

What is the purpose of the WP pin?

The Write-Protect (WP) pin allows hardware protection of the entire memory array. When tied to VCC, write operations are inhibited, while read operations remain unaffected.