MR20H40DFR

Memory IC Overview

The MR20H40DFR is a 4 Mbit magnetoresistive random access memory (MRAM) device manufactured by Everspin Technologies Inc. It features an SPI serial interface and is organized as 512K x 8 bits with an 8-bit data bus width. The component operates within a supply voltage range of 3 V to 3.6 V, drawing 13.8 mA during active operation and 33 mA at peak current. It supports a clock rate of up to 50 MHz and offers a typical access time of 20 ns. The device is housed in an 8-DFN surface-mount package and is rated for industrial operating temperatures ranging from -40°C to +85°C.

Memory IC Feature Summary

• Provides non-volatile storage using magnetic tunnel junctions that retain data without power.
• Enables direct byte-level writes without requiring page programming or erase cycles.
• Offers unlimited write endurance compared to traditional flash or EEPROM technologies.
• Maintains data integrity for over 20 years under specified industrial temperature conditions.

Memory IC Applications

• Industrial control systems requiring frequent data logging
• Smart metering applications needing reliable non-volatile storage
• Data recorders demanding high write durability

Memory IC Procurement Notes

Verify the specific suffix 'DFR' against official datasheets to confirm it denotes the tape-and-reel packaging format rather than tray packaging. Ensure the selected variant matches the required industrial temperature grade (-40°C to +85°C). Confirm RoHS compliance status through the manufacturer's latest documentation before finalizing procurement orders.

Memory IC Selection Notes

Select this component when replacing serial EEPROM or Flash in designs requiring infinite write endurance. Verify that the host microcontroller supports the standard SPI protocol compatible with the 50 MHz clock rate. Ensure the PCB layout accommodates the 8-DFN package dimensions and thermal requirements for continuous operation within the specified voltage range.

Memory IC Part Context

This part belongs to the MR20H40 family of 4 Mbit MRAM devices designed for high-performance embedded applications. It serves as a drop-in replacement for legacy serial memory technologies in space-constrained designs. The family shares common architectural features including low power consumption and fast write speeds across various package options.

Memory IC Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Cross-reference pinouts and timing parameters carefully if considering alternative MRAM vendors.

Memory IC FAQ

Does the MR20H40DFR require erase cycles before writing new data?

No, the MR20H40DFR supports direct byte-level writes without any preceding erase or page programming cycles.

What is the maximum clock frequency supported by the SPI interface?

The SPI interface supports a maximum clock rate of 50 MHz.