25LC128T-E/SN

Overview

The Microchip Technology 25LC128T-E/SN is a 128 Kbit Serial Electrically Erasable PROM featuring a 16,384 x 8-bit organization. It operates via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC voltages between 4.5V and 5.5V. The device supports a supply voltage range of 2.5V to 5.5V and utilizes an 8-lead SOIC package (3.90 mm width). It offers self-timed erase and write cycles with a maximum duration of 5 ms. The component is qualified for extended temperature ranges from -40°C to +125°C.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes hardware write protection mechanisms utilizing a dedicated WP pin and internal STATUS register bits.
• Features a HOLD input that allows suspension of serial communication without resetting the current sequence.
• Provides block write protection capabilities allowing selective protection of none, one-quarter, one-half, or all array segments.

Applications

• Data storage in microcontroller systems requiring non-volatile configuration retention
• Embedded applications needing secure parameter logging with hardware write protection
• Industrial control systems operating within extended temperature environments

Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and the 'SN' indicates the 8-lead SOIC package. Confirm the 'T' designation aligns with the required tape and reel packaging format rather than tube distribution. Ensure compatibility with the 2.5V minimum supply voltage requirement for the LC series variant.

Selection Notes

Select this component when an SPI interface is required for 128 Kbit non-volatile storage in space-constrained designs using surface-mount technology. The extended temperature grade is suitable for harsh industrial environments. Consider the 64-byte page write limit and the necessity of managing page boundary crossings in software to prevent data overwriting during write operations.

Part Context

This part belongs to the 25LC128 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in supply voltage requirements, supporting a minimum of 2.5V compared to the AA series' 1.8V. The device is designed for direct interfacing with popular microcontroller families possessing built-in SPI ports.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.