25LC256-M/MF

Overview

The Microchip Technology 25LC256-M/MF is a 256 Kbit (32K x 8) serial electrically erasable programmable read-only memory (EEPROM). It utilizes an SPI bus interface supporting modes 0 and 3 with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5 V to 5.5 V and features an 8-pin DFN-S-EP package. Designed for industrial reliability, it offers a data retention period of 200 years and supports one million erase/write cycles. The component is rated for an extended operating temperature range from -55°C to +125°C.

Feature Summary

• Supports standard SPI communication protocols in modes 0 and 3 for reliable data transfer.
• Engineered for extreme environmental stability with an extended temperature range suitable for harsh conditions.
• Provides high endurance with a specified one million erase/write cycle capability.
• Ensures long-term data integrity through a verified 200-year retention specification.

Applications

• Embedded storage applications requiring robust data retention
• Industrial control systems operating in extreme temperatures
• Automotive electronics demanding high reliability
• IoT devices utilizing PIC32MM microcontrollers

Procurement Notes

Verify the specific suffix 'M/MF' confirms the military-grade temperature rating and DFN-S-EP package type. Ensure compatibility with system voltage levels between 2.5 V and 5.5 V. Confirm that the SPI interface mode aligns with the host controller's configuration. Check for any specific handling requirements associated with the exposed pad thermal termination design.

Selection Notes

Select this component when standard commercial or industrial grade parts are insufficient due to extreme temperature requirements. The 256 Kbit capacity is suitable for storing calibration data, configuration parameters, or small datasets. The DFN-S-EP package offers a compact footprint with improved thermal dissipation compared to traditional plastic packages. Consider the 10 MHz clock speed if higher throughput is necessary for the application.

Part Context

This part belongs to the 25LC256 family of serial EEPROMs manufactured by Microchip Technology. While other variants like the 25LC256-I/P or 25LC256X-E/ST exist, they typically feature different packages such as PDIP or TSSOP and operate within narrower temperature ranges. The '-M/MF' designation specifically denotes the military-grade temperature extension and the specific surface-mount package style.

Replacement Considerations

Direct replacements must match the 256 Kbit capacity, SPI interface, and -55°C to +125°C temperature range. Verify pinout compatibility with the 8-pin DFN-S-EP footprint. Generic 25LC256 parts may lack the required wide temperature tolerance. Consult official substitution lists for confirmed equivalents with identical electrical and mechanical specifications.

FAQ

What SPI modes does the 25LC256-M/MF support?

The device supports SPI modes 0 and 3, allowing flexibility in clock polarity and phase settings for the master controller.

What is the data retention period for this EEPROM?

The 25LC256-M/MF guarantees a data retention period of 200 years under specified operating conditions.

Does the DFN-S-EP package include a thermal pad?

Yes, the DFN-S-EP package features an exposed pad (EP) designed to facilitate thermal dissipation and provide mechanical attachment.