25LC128-E/P

Overview

The Microchip Technology 25LC128-E/P is a 128 Kbit (16K x 8) 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, or 5 MHz at 2.5V to 4.5V. The device features a 64-byte page buffer, self-timed erase/write cycles with a maximum duration of 5 ms, and high reliability including 1,000,000 erase/write cycle endurance and data retention exceeding 200 years. It is housed in an 8-lead PDIP package and rated for extended temperature operation from -40°C to +125°C.

Feature Summary

• Supports sequential read operations and page write capabilities up to 64 bytes per cycle.
• Includes built-in hardware write protection via the WP pin and software block protection through the STATUS register.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.

Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Industrial control applications operating in extended temperature environments
• Embedded systems needing reliable parameter logging

Procurement Notes

Verify that the specific part number suffix matches the required temperature grade and package type. Confirm RoHS compliance status as indicated in official documentation. Ensure compatibility with system voltage levels, noting the minimum 2.5V requirement for this extended temperature variant. Check for any recent Product Change Notifications affecting packaging or assembly processes.

Selection Notes

Select this component when extended industrial temperature performance (-40°C to +125°C) is required alongside standard SPI interface compatibility. Compare against the 25AA128 if lower voltage operation down to 1.8V is necessary, as the 25LC128 requires a minimum of 2.5V. Consider the PDIP package only if through-hole mounting is mandated by the PCB design constraints.

Part Context

This device belongs to the 25XX128 family of 128 Kbit SPI Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in operating voltage range and temperature specifications. The family provides a cost-effective solution for small data storage needs in embedded applications requiring high endurance and long-term data retention.

Replacement Considerations

Public confirmed substitute part numbers include 25LC128-I/P for industrial temperature range variants. Other package options within the same electrical specification include 25LC128-E/SN (SOIC) and 25LC128-E/ST (TSSOP). Verify pinout and electrical characteristics match before substitution.

FAQ

What is the maximum clock frequency supported by the 25LC128-E/P?

The device supports a maximum clock frequency of 10 MHz when VCC is between 4.5V and 5.5V. At lower voltages (2.5V to 4.5V), the maximum frequency is 5 MHz.

How does the Write Protect (WP) pin function?

The WP pin works in conjunction with the WPEN bit in the STATUS register. When WPEN is high and WP is low, writing to the nonvolatile bits in the STATUS register is disabled. If WPEN is low, the WP pin function is blocked.

What is the data retention period specified for this EEPROM?

The datasheet specifies a data retention period of greater than 200 years under normal operating conditions.