25LC128T-E/SM

Overview

The Microchip Technology 25LC128T-E/SM is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at 4.5V ≤ Vcc ≤ 5.5V. The device utilizes an SPI-compatible serial bus with separate data in (SI) and data out (SO) lines. It features a 64-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and extended temperature operation from -40°C to +125°C. The component is housed in an 8-lead TSSOP package.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Includes built-in write protection mechanisms such as a write enable latch and hardware WP pin.
• Features a HOLD input to suspend serial transmission without resetting the sequence.
• Provides block write protection allowing selection of none, 1/4, 1/2, or all array segments.

Applications

• Data storage for configuration parameters in microcontroller systems
• Non-volatile memory for firmware updates or calibration data
• Industrial control systems requiring extended temperature reliability

Procurement Notes

Verify that the ordering suffix 'SM' corresponds to the 8-lead TSSOP package and 'E' indicates the extended temperature grade (-40°C to +125°C). Confirm RoHS compliance status and ensure the specific revision of the datasheet DS20001831F matches the production lot requirements. Check for any recent Product Change Notifications (PCN) regarding assembly or material changes.

Selection Notes

Select this part when an SPI interface is required with extended temperature capability down to -40°C and up to +125°C. Ensure the system voltage remains within the 2.5V to 5.5V operating range. Consider the 64-byte page write limitation and the need for software management of page boundaries to prevent data wrap-around during writes.

Part Context

This component belongs to the 25XX128 family of 128K SPI Bus Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in supply voltage requirements and temperature ranges. The family offers multiple package options including DFN, PDIP, SOIC, SOIJ, and TSSOP to accommodate various PCB layout constraints.

Replacement Considerations

The 25LC128T-I/SM is a compatible alternative offering the same electrical specifications but restricted to the industrial temperature range (-40°C to +85°C). Verify that the lower temperature limit of the replacement meets the application's environmental requirements before substitution.