24LC128-E/P

Memory IC Overview

The Microchip Technology 24LC128-E/P 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 a maximum clock frequency of 400 kHz via an I2C compatible two-wire serial interface. The device features Schmitt trigger inputs for noise suppression, hardware write protection, and output slope control to eliminate ground bounce. It offers more than one million erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead PDIP package and is rated for extended 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 a 64-byte page write buffer to facilitate efficient sequential data writing.
• Features hardware write protection controlled by 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 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 suffix 'P' indicates the 8-lead PDIP package. Confirm the specific voltage requirements align with the 2.5V minimum specification for the 24LC128 series, distinct from the 1.7V capability of other variants in the family.

Memory IC Selection Notes

Select this part when an I2C interface is required alongside through-hole mounting capabilities. Ensure the application voltage does not drop below 2.5V, as lower voltages are supported only by the 24AA128 or 24FC128 variants. Consider the 64-byte page write limit when designing software to prevent data overflow across physical page boundaries.

Memory IC Part Context

This component belongs to the 24XX128 family, which includes the 24AA128 and 24FC128. While sharing identical memory architecture and interface protocols, the 24LC128 is distinguished by its 2.5V minimum operating voltage and 400 kHz maximum clock speed. The 'E' suffix denotes automotive-grade reliability and extended temperature performance compared to standard industrial grades.

Memory IC Replacement Considerations

The 24LC128-I/P serves as a direct substitute if industrial temperature range (-40°C to +85°C) suffices. For lower voltage operations down to 1.7V, the 24AA128-E/P is compatible. Higher speed requirements up to 1 MHz can be met by the 24FC128-E/P, provided voltage constraints are observed.