MR20H40DF

Memory IC Overview

The MR20H40DF is a 4 Mbit magnetoresistive random access memory (MRAM) device organized as 512K x 8 bits. It operates on a 3.3V power supply with a voltage range of 3.0V to 3.6V and supports SPI interface clock rates up to 50 MHz. The component utilizes an 8-pin DFN small flag package for surface mount installation. It features industrial temperature ratings from -40°C to +85°C, ensuring reliable data retention exceeding 20 years.

Memory IC Feature Summary

• Provides unlimited write endurance without the degradation limits found in traditional flash or EEPROM technologies.
• Enables immediate data writing at random addresses with no page programming or erase cycle delays.
• Maintains automatic data protection during power loss events to ensure integrity.
• Offers direct pin compatibility with serial EEPROM and Flash devices for simplified hardware upgrades.

Memory IC Applications

• Industrial control systems requiring high durability
• Smart metering and utility infrastructure
• Data logging equipment with frequent write cycles

Memory IC Procurement Notes

Verify the specific suffix 'DF' indicates the 8-pin DFN small flag package variant when sourcing replacements. Confirm that the host system accommodates the HOLD# function on Pin 7, which differs from standard FRAM implementations. Ensure the design supports the required 3.3V logic levels and SPI timing constraints for seamless integration into existing serial memory slots.

Memory IC Selection Notes

Select this component when applications demand infinite write endurance and zero write latency compared to conventional non-volatile memories. It serves as a direct drop-in replacement for serial EEPROM and Flash in designs utilizing standard SPI interfaces. Consider this part for environments requiring robust data retention over extended operational lifespans without complex wear-leveling algorithms.

Memory IC Part Context

This device belongs to the MR2xH40 series of 4 Mbit MRAM products manufactured by Everspin Technologies. The series is designed to replace legacy serial memory types while offering superior performance characteristics. The MR20H40DF specifically denotes the industrial temperature grade version housed in the compact DFN small flag package format.

Memory IC Replacement Considerations

The MR20H40CDFR is a verified substitute within the same product family. Note that Pin 7 functions as HOLD# on this MRAM device, whereas it may be unused on some compatible FRAM replacements. Hardware modifications may be necessary if the original design relied on Pin 7 being unconnected.