24LC128-E/SN

Memory IC Overview

The Microchip Technology 24LC128-E/SN is a 128 Kbit (16K x 8) serial electrically erasable programmable read-only memory (EEPROM). It operates on a single supply voltage ranging from 2.5 V to 5.5 V and supports I2C compatible two-wire serial communication with a maximum clock frequency of 400 kHz. The device features a 64-byte page write buffer, hardware write protection via the WP pin, and Schmitt trigger inputs for noise suppression. It provides over one million erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead SOIC package and functions within an extended temperature range of -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using configurable chip select pins A0, A1, and A2.
• Includes hardware write protection that inhibits write operations when the WP pin is tied to VCC.
• Features output slope control designed to eliminate ground bounce during operation.

Memory IC Applications

• Personal communications systems
• Data acquisition applications
• Low-power electronic circuits

Memory IC Procurement Notes

Verify the specific ordering suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and the 'SN' suffix indicates the 8-lead SOIC package. Confirm the device meets RoHS compliance requirements for your assembly process. Ensure the application circuit provides adequate pull-up resistors on the SDA and SCL lines to support the 400 kHz clock frequency specified for this voltage range.

Memory IC Selection Notes

Select this part when a non-volatile memory solution requires operation at voltages starting at 2.5 V. The 24LC128 series is distinct from the 24AA128, which supports lower voltages down to 1.7 V. Choose the 24LC128 specifically for designs where the minimum operating voltage is 2.5 V or higher. The extended temperature grade ensures reliability in harsh environments compared to industrial grades limited to 85°C.

Memory IC Part Context

This component belongs to the 24XX128 family, which includes the 24AA128, 24LC128, and 24FC128 variants. These devices share identical pinouts and functional protocols but differ in supply voltage ranges and maximum clock speeds. The 24LC128 variant is optimized for standard 2.5 V to 5.5 V applications, whereas the 24FC128 supports higher frequencies up to 1 MHz.

Memory IC Replacement Considerations

The 24LC128-I/SN serves as a direct substitute if the extended temperature range is not required. Other packages such as TSSOP or MSOP may be used if board space constraints differ, provided the pinout compatibility is maintained.