25LC128X-E/ST

Overview

The Microchip Technology 25LC128X-E/ST is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at voltages between 4.5V and 5.5V. The device features a 64-byte page buffer for efficient writing and includes hardware write protection capabilities. It is designed for extended industrial applications with an operating temperature range of -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication with a maximum clock frequency of 10 MHz
• Includes built-in power-on/off data protection and a write enable latch mechanism
• Offers programmable block write protection for none, one-quarter, one-half, or all of the memory array
• Features a hold pin to suspend transmission without resetting the serial sequence

Applications

• Microcontroller systems requiring non-volatile configuration storage
• Industrial control units needing reliable data retention in extreme temperatures
• Embedded devices utilizing SPI interfaces for parameter logging
• Systems requiring hardware-level write protection for critical data segments

Procurement Notes

Verify that the specific ordering suffix corresponds to the 8-lead TSSOP package and Extended Temperature grade (-40°C to +125°C). Confirm the voltage range requirement aligns with the 2.5V minimum specification for the LC series. Ensure compatibility with standard SPI modes before integration into the design.

Selection Notes

Select this component when an extended temperature range up to 125°C is required alongside standard SPI interface compatibility. The 2.5V minimum supply voltage distinguishes it from lower-voltage variants. Consider the 64-byte page size for write efficiency and the availability of hardware write protection features for security-sensitive applications.

Part Context

This part belongs to the 25LC128 family of 128 Kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in supply voltage requirements and temperature ratings. The 'E' suffix denotes the extended temperature grade, while '/ST' indicates the 8-lead TSSOP package option.

Replacement Considerations

Public confirmed substitute part numbers include 25LC128-I/ST for industrial temperature ranges and 25LC128T-E/SN for SOIC packages. Verify pinout compatibility and voltage specifications when substituting.