25AA128-I/MF

Memory IC Overview

The Microchip Technology 25AA128-I/MF is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM. It features an SPI-compatible interface with a maximum clock frequency of 10 MHz at VCC ≥ 4.5V. The device operates within a supply voltage range of 1.8V to 5.5V and supports industrial temperature ranges (-40°C to +85°C). It utilizes low-power CMOS technology, offering standby current as low as 5 µA. The memory includes self-timed erase/write cycles with a maximum duration of 5 ms.

Memory IC Feature Summary

• Supports sequential read operations and page writes up to 64 bytes within a single physical page boundary.
• Includes hardware write protection via the WP pin and software block protection for none, 1/4, 1/2, or all of the array.
• Features a HOLD input to suspend serial communication without resetting the sequence, allowing host interrupt servicing.
• Provides built-in power-on/off data protection and a write enable latch to prevent inadvertent writes.

Memory IC Applications

• Data storage in microcontroller systems requiring non-volatile configuration parameters.
• Industrial control applications needing reliable data retention under varying voltage conditions.
• Embedded systems utilizing SPI buses for low-pin-count memory expansion.

Memory IC Procurement Notes

Verify the specific suffix 'MF' corresponds to the 8-lead DFN package when sourcing. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C. Ensure the voltage range requirement aligns with the 1.8V minimum specification, distinguishing it from the 2.5V minimum variant. Check RoHS compliance status if required by your manufacturing standards.

Memory IC Selection Notes

Select this component for designs requiring low-voltage operation down to 1.8V, unlike the 25LC128 which requires a minimum of 2.5V. The 8-lead DFN package offers a compact footprint suitable for space-constrained PCB layouts. Consider the 10 MHz clock speed for high-throughput SPI applications. Verify that the system can accommodate the 5 ms internal write cycle time during programming operations.

Memory IC Part Context

This part belongs to the 25XX128 family of 128 Kbit SPI EEPROMs. It shares functional compatibility with the 25LC128 but differs in operating voltage and temperature grading. The 'I' suffix indicates Industrial temperature range, while 'MF' specifies the 8-lead DFN package type. This family is designed for direct interfacing with popular microcontroller families supporting standard SPI protocols.

Memory IC Replacement Considerations

The 25LC128-I/MF is a functional substitute but requires a minimum supply voltage of 2.5V instead of 1.8V. Other 25AA128 variants with different packages (e.g., ST for TSSOP) are pin-compatible but require layout adjustments. No other direct cross-manufacturer equivalents are confirmed in the provided documentation.