25LC128-E/ST

Overview

The Microchip Technology 25LC128-E/ST is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM. It operates within a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features a 64-byte page size and self-timed erase/write cycles with a maximum duration of 5 ms. It is housed in an 8-lead TSSOP package and is rated for extended industrial temperature operation from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication through an SPI-compatible interface with a maximum clock frequency of 10 MHz.
• Includes built-in write protection mechanisms such as a write enable latch, power-on/off data protection circuitry, and a dedicated hardware write-protect pin.
• Offers block write protection capabilities allowing users to protect none, one-quarter, one-half, or the entire memory array.
• Features a hold input pin that allows suspension of serial transmission without resetting the sequence.

Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Industrial control applications operating in extended temperature environments
• Embedded systems needing hardware-level write protection

Procurement Notes

Verify the specific ordering suffix 'E' confirms the extended temperature range (-40°C to +125°C) and the '/ST' indicates the 8-lead TSSOP package. Confirm RoHS compliance status and ensure the required voltage range aligns with the 2.5 V minimum specification for this variant.

Selection Notes

Select this component when an extended temperature range is required alongside standard SPI EEPROM functionality. Ensure the system voltage does not drop below 2.5 V, as lower voltages are supported by the 25AA128 variant instead. Verify that the 8-lead TSSOP footprint matches the PCB layout requirements.

Part Context

This part belongs to the 25XX128 family of 128 Kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in its minimum operating voltage and temperature rating. The family provides low-power CMOS technology and high reliability with over one million erase/write cycles.

Replacement Considerations

The 25LC128-I/ST serves as a direct substitute if the extended temperature range is not required, offering the same electrical characteristics within the industrial temperature range. Other variants in the 25LC128 series may be considered based on package type preferences.