25LC128-E/SM

Overview

The Microchip Technology 25LC128-E/SM 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 data writing and includes self-timed erase and write cycles with a maximum duration of 5 ms. It is housed in an 8-lead SOIJ package and is rated for extended industrial temperature operation from -40°C to +125°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Includes hardware write protection mechanisms such as a Write-Protect pin and programmable block protection bits.
• Features a Hold input pin that allows suspension of serial communication without resetting the sequence.
• Provides high reliability with over one million erase/write cycles and data retention exceeding 200 years.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'E' confirms the extended temperature range (-40°C to +125°C) and the 'SM' suffix indicates the 8-lead SOIJ package. Confirm the device meets RoHS compliance requirements for your assembly process. Ensure the system design accommodates the 2.5V minimum supply voltage requirement distinct from lower voltage variants.

Selection Notes

Select this component when an extended temperature range up to 125°C is required alongside standard SPI interface compatibility. The 128 Kbit capacity suits applications needing moderate data persistence. Consider the 64-byte page size for write efficiency and verify that the 8-lead SOIJ package fits the available PCB footprint constraints compared to standard SOIC or TSSOP options.

Part Context

This part belongs to the 25XX128 family of serial EEPROMs, which also includes the 25AA128 variant. The primary distinction lies in the supply voltage range and temperature grade; the 25LC128 requires a minimum of 2.5V and offers extended temperature options, whereas the 25AA128 supports 1.8V operation. Both share identical memory organization and instruction sets.

Replacement Considerations

The 25LC128-I/SM serves as the industrial temperature grade equivalent within the same package. Cross-model substitution with the 25AA128 series requires verification of the supply voltage headroom, as the AA variant supports lower voltages but may not meet the extended temperature specifications of the E-grade part.