25LC128XT-E/ST

Overview

The Microchip Technology 25LC128XT-E/ST is a 128 Kbit Serial Electrically Erasable PROM featuring a 16,384 x 8-bit organization. It operates on a 2.5V to 5.5V supply voltage and supports SPI clock frequencies up to 10 MHz at higher voltages. The device utilizes an 8-lead TSSOP package and functions within an extended temperature range of -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via a standard SPI-compatible interface with hold functionality for bus pausing.
• Includes hardware write protection mechanisms controlled by the WP pin and STATUS register bits.
• Features self-timed erase and write cycles with internal write cycle completion monitoring.

Applications

• Data storage in industrial control systems requiring extended temperature stability
• Configuration memory for microcontrollers operating in harsh environments
• Non-volatile parameter logging in automotive or outdoor electronic devices

Procurement Notes

Verify the specific 'XT' suffix against official Microchip documentation to confirm if it denotes a tape-and-reel variant or a distinct qualification level, as standard datasheets list 'T' for reel packaging. Ensure the Extended temperature grade (E) matches your thermal requirements. Confirm RoHS compliance status through current manufacturer declarations.

Selection Notes

Select this component when applications demand non-volatile storage in extreme thermal conditions beyond standard industrial limits. The 128 Kbit capacity suits moderate data retention needs. Verify that the system voltage remains within the 2.5V to 5.5V operational window to ensure reliable SPI communication and write endurance.

Part Context

This part belongs to the 25LC128 family of 128 Kbit SPI EEPROMs from Microchip. It shares architectural similarities with the 25AA128 but differs in minimum operating voltage and temperature range specifications. The family provides various package options including SOIC, PDIP, and DFN, catering to diverse PCB layout constraints.

Replacement Considerations

Direct substitutes include other 25LC128 variants with matching temperature grades and packages, such as 25LC128-E/SN or 25LC128-I/ST, provided the voltage and thermal specs align with the design requirements.