MR20H40DFR MRAM Memory IC Equivalent & Substitute Parts

Part Overview

The MR20H40DFR is a 4Mbit Magnetoresistive RAM (MRAM) memory IC manufactured by Everspin Technologies Inc., featuring SPI interface operation at 50 MHz with 512K x 8 memory organization in an 8-DFN-EP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts maintain core memory specifications while offering improved product status and extended operating temperature ranges.

Substiute Parts

MR20H40DFR

Everspin Technologies Inc.In Stock: 1158MR20H40DFR Datasheet

Current PartRFQ

MR20H40CDFR

Everspin Technologies Inc.In Stock: 3707MR20H40CDFR Datasheet

MFR RecommendedRFQ

MR25H40CDFR

Everspin Technologies Inc.In Stock: 996MR25H40CDFR Datasheet

MFR RecommendedRFQ

MR25H40MDFR

Everspin Technologies Inc.In Stock: 840MR25H40MDFR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MR20H40DFR is determined by the following critical parameters:

Core Compatibility Parameters:

• Memory Size: 4Mbit (fixed requirement)
• Memory Organization: 512K x 8 (fixed requirement)
• Memory Type: Non-Volatile MRAM (fixed requirement)
• Package Type: 8-DFN-EP, Small Flag (5x6) (fixed requirement)
• Supply Voltage: 3V ~ 3.6V (fixed requirement)
• Interface: SPI (fixed requirement)

Variable Parameters Allowing Substitution:

• Clock Frequency: 50 MHz (main part) to 40 MHz (substitute parts) — lower frequency operation is backward compatible
• Operating Temperature Range: Extended ranges (-40°C ~ 85°C or -40°C ~ 125°C) are compatible with the original 0°C ~ 70°C specification
• Product Status: Active substitutes replace obsolete main part
• Moisture Sensitivity Level: MSL 1 (main part) to MSL 3 (substitute parts) — higher MSL values indicate more stringent storage requirements but do not affect electrical compatibility

All substitute parts maintain identical electrical and mechanical interfaces, enabling direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

MR20H40CDFR — Direct frequency-matched substitute with extended commercial temperature range (-40°C ~ 85°C). Maintains 50 MHz clock frequency operation identical to the main part. Active product status ensures long-term availability. Suitable for applications requiring the original 50 MHz performance specification with improved temperature operating margins.

MR25H40CDFR — Frequency-reduced substitute operating at 40 MHz with extended commercial temperature range (-40°C ~ 85°C). Applicable to designs where 40 MHz SPI clock operation is acceptable. Active product status and standard commercial grade qualification support general industrial applications.

MR25H40MDFR — Automotive-grade substitute with AEC-Q100 qualification, operating at 40 MHz with extended temperature range (-40°C ~ 125°C). Designated for automotive and high-reliability applications requiring automotive-grade components. Highest operating temperature specification among all substitutes.

All substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the main part.

Frequently Asked Questions (FAQ)

Q: Can MR25H40CDFR or MR25H40MDFR replace MR20H40DFR in existing designs?

A: Yes, both parts are electrically and mechanically compatible. The primary difference is clock frequency: MR25H40 series operates at 40 MHz versus the original 50 MHz. If your design's SPI bus operates at 40 MHz or lower, these parts are direct substitutes. If your design requires 50 MHz operation, use MR20H40CDFR instead.

Q: What is the difference between MR25H40CDFR and MR25H40MDFR?

A: Both operate at 40 MHz with identical memory specifications and package. MR25H40MDFR is automotive-grade (AEC-Q100 qualified) with operating temperature range -40°C ~ 125°C, while MR25H40CDFR is commercial-grade with operating temperature range -40°C ~ 85°C. Select MR25H40MDFR for automotive applications; use MR25H40CDFR for general industrial applications.

Q: Are all substitute parts in the same 8-DFN-EP package?

A: Yes. All parts use the identical 8-DFN-EP (5x6) Small Flag package with exposed pad. No PCB layout modifications are required for substitution.

Q: What does MSL 3 (168 Hours) mean compared to MSL 1 (Unlimited)?

A: MSL (Moisture Sensitivity Level) indicates storage humidity requirements. MSL 1 has unlimited shelf life under standard conditions. MSL 3 requires storage below 30% relative humidity and has a 168-hour floor life after opening. This affects component handling and storage procedures but does not impact electrical performance.

Q: Is MR20H40CDFR a direct replacement for MR20H40DFR?

A: Yes. MR20H40CDFR maintains identical 50 MHz clock frequency and memory specifications. The primary advantage is active product status (versus obsolete) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). This is the recommended substitute for designs requiring the original 50 MHz performance.