MR20H40DF MRAM Memory IC Equivalent & Substitute Parts

Part Overview

The MR20H40DF is a 4Mbit MRAM (Magnetoresistive RAM) memory IC manufactured by Everspin Technologies Inc., featuring SPI interface at 50 MHz with 8-DFN-EP packaging. This non-volatile memory device operates at 3V to 3.6V supply voltage across a 0°C to 70°C temperature range. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

MR20H40DF

Everspin Technologies Inc.In Stock: 1104MR20H40DF Datasheet

Current PartRFQ

MR20H40CDF

Everspin Technologies Inc.In Stock: 2098MR20H40CDF Datasheet

MFR RecommendedRFQ

MR25H40CDC

Everspin Technologies Inc.In Stock: 1744MR25H40CDC Datasheet

MFR RecommendedRFQ

MR25H40CDF

Everspin Technologies Inc.In Stock: 19755MR25H40CDF Datasheet

MFR RecommendedRFQ

MR25H40MDF

Everspin Technologies Inc.In Stock: 3958MR25H40MDF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MR20H40DF is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory technology: MRAM (Magnetoresistive RAM)
• Memory size: 4Mbit
• Memory organization: 512K x 8
• Interface: SPI
• Supply voltage: 3V ~ 3.6V
• Package type: 8-VDFN Exposed Pad
• Mounting type: Surface Mount

Substitution Constraints:

• Clock frequency must be equal to or greater than 50 MHz
• Operating temperature range must encompass or exceed 0°C ~ 70°C
• All parts must maintain ROHS3 compliance

The substitute parts are grouped into two categories based on clock frequency and temperature specifications:

Category 1 - Direct Frequency Match (50 MHz): MR20H40CDF maintains the original 50 MHz clock frequency with extended temperature range (-40°C ~ 85°C), providing direct functional equivalence with improved thermal performance.

Category 2 - Reduced Frequency (40 MHz): MR25H40CDC, MR25H40CDF, and MR25H40MDF operate at 40 MHz, which is below the original specification. These parts are listed as manufacturer-recommended substitutes but require design verification for clock-dependent applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MR20H40CDF

MR20H40CDF is the recommended substitute for MR20H40DF. This part maintains identical clock frequency (50 MHz) and memory specifications while offering an extended operating temperature range (-40°C ~ 85°C). The part is currently in active production status, ensuring long-term availability. Both parts share the same small flag package variant (5x6), eliminating PCB layout modifications. ROHS3 compliance is maintained.

Secondary Substitutes: MR25H40CDF and MR25H40MDF

MR25H40CDF and MR25H40MDF operate at 40 MHz, which is 10 MHz below the original specification. Both parts are in active production status and maintain the small flag package variant. MR25H40CDF offers standard industrial temperature range (-40°C ~ 85°C), while MR25H40MDF extends to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. These parts are suitable only for applications where 40 MHz clock frequency is acceptable.

Not Recommended: MR25H40CDC

MR25H40CDC is classified as "Not For New Designs" and features a large flag package variant (5x6), requiring PCB layout modifications compared to the original small flag design. While functionally compatible at 40 MHz, the product status and package change make this option unsuitable for new implementations.

Frequently Asked Questions (FAQ)

Q: Can MR20H40CDF be used as a direct replacement for MR20H40DF without design changes?

A: Yes. MR20H40CDF maintains the same 50 MHz clock frequency, 4Mbit capacity, SPI interface, supply voltage range (3V ~ 3.6V), and small flag 8-DFN-EP package. The extended temperature range (-40°C ~ 85°C) provides improved thermal coverage. No PCB layout or firmware modifications are required.

Q: What is the impact of using 40 MHz parts (MR25H40CDF or MR25H40MDF) in a design specified for 50 MHz?

A: The 40 MHz clock frequency is 10 MHz lower than the original specification. This affects maximum SPI communication speed and data throughput. Applications with strict timing requirements or high-speed data transfer may experience performance degradation. Design verification is necessary to confirm compatibility.

Q: Why is MR25H40CDC listed as a substitute if it is "Not For New Designs"?

A: MR25H40CDC is included as a manufacturer-recognized substitute but carries a "Not For New Designs" status, indicating Everspin does not recommend it for new product development. Additionally, the large flag package variant requires PCB layout modifications. This part should be avoided for new implementations.

Q: What is the difference between the small flag and large flag package variants?

A: The small flag (5x6) and large flag (5x6) variants refer to different pad configurations within the 8-DFN-EP package. These are not mechanically interchangeable without PCB redesign. MR20H40DF and MR20H40CDF use small flag; MR25H40CDC uses large flag; MR25H40CDF and MR25H40MDF use small flag.

Q: Is MR25H40MDF suitable for automotive applications?

A: MR25H40MDF carries AEC-Q100 automotive qualification and operates across -40°C ~ 125°C, making it suitable for automotive-grade designs. However, the 40 MHz clock frequency must be verified against application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (MR20H40CDF, MR25H40CDC, MR25H40CDF, MR25H40MDF) maintain ROHS3 compliance, matching the original MR20H40DF specification.