AT45DB041D-MU-SL955 Equivalent & Substitute Parts

Part Overview

The AT45DB041D-MU-SL955 is a 4Mbit FLASH memory IC with SPI interface operating at 66 MHz, manufactured by Renesas Electronics Corporation. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement planning. The part is packaged in 8-VDFN (6x5) with exposed pad and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

AT45DB041D-MU-SL955

Renesas Electronics CorporationIn Stock: 1136AT45DB041D-MU-SL955 Datasheet

Current PartRFQ

AT45DB041E-MHN2B-T

Renesas Electronics CorporationIn Stock: 1081AT45DB041E-MHN2B-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT45DB041D-MU-SL955 is determined by the following critical parameters:

• Memory Capacity: Must be 4Mbit to maintain firmware and data storage compatibility
• Memory Interface: Must be SPI to ensure protocol compatibility with existing host controllers
• Memory Organization: Must be 256 Bytes x 2048 pages to preserve addressing and access patterns
• Operating Temperature Range: Must support -40°C to 85°C minimum
• Supply Voltage Compatibility: Substitute must operate within or be compatible with the system's power supply range
• Package Footprint: Physical dimensions must be compatible with PCB layout constraints
• Base Product Family: AT45DB041 series devices share the same core architecture and command set

The identified substitute AT45DB041E-MHN2B-T maintains all critical functional parameters while offering enhanced performance characteristics and improved product status.

Parameter Comparison

Engineering Selection Recommendations

The AT45DB041E-MHN2B-T is a direct functional substitute for the AT45DB041D-MU-SL955 based on the following engineering criteria:

Product Status: The substitute is classified as Active, ensuring continued availability and manufacturer support, whereas the main part is Obsolete. This transition is necessary for long-term supply chain reliability.

Compliance & Certifications: The AT45DB041E-MHN2B-T carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The substitute's MSL 1 rating provides superior moisture handling compared to the main part's MSL 3 rating.

Performance Enhancement: The substitute operates at 85 MHz versus 66 MHz, providing 29% higher clock frequency. Page write time is reduced from 4ms to 3ms, improving programming speed. These enhancements are backward compatible with systems designed for the original part.

Voltage Supply Consideration: The substitute operates at 1.65V ~ 3V, which overlaps with the main part's 2.7V ~ 3.6V range. Systems operating at 2.7V to 3V will function with both parts. Systems requiring operation below 1.65V or above 3V must use the original part or implement voltage regulation.

Package Footprint: The substitute uses 8-UDFN (5x6) versus the original 8-VDFN (6x5). PCB layout verification is required to confirm physical compatibility, as package dimensions differ.

Frequently Asked Questions (FAQ)

Q: Can the AT45DB041E-MHN2B-T directly replace the AT45DB041D-MU-SL955 without firmware changes?

A: Yes, both devices share identical SPI command sets, memory organization (256 Bytes x 2048 pages), and 4Mbit capacity. No firmware modifications are required for functional operation. However, PCB layout must accommodate the different package dimensions (8-UDFN vs. 8-VDFN).

Q: What is the voltage supply compatibility between these parts?

A: The main part operates at 2.7V ~ 3.6V, while the substitute operates at 1.65V ~ 3V. The overlap range is 2.7V to 3V. If your system operates within this range, both parts are compatible. Systems requiring 3V to 3.6V operation must use the original part or implement voltage regulation for the substitute.

Q: Are there package footprint differences that affect PCB design?

A: Yes. The AT45DB041D-MU-SL955 uses 8-VDFN (6x5mm), while the AT45DB041E-MHN2B-T uses 8-UDFN (5x6mm). The packages have different dimensions and pin layouts. PCB redesign or adapter solutions may be necessary. Verify footprint compatibility with your PCB design tools before committing to the substitute.

Q: What are the advantages of switching to the AT45DB041E-MHN2B-T?

A: The substitute offers Active product status (versus Obsolete), ROHS3 compliance, superior moisture sensitivity (MSL 1 vs. MSL 3), higher clock frequency (85 MHz vs. 66 MHz), and faster page write time (3ms vs. 4ms). These improvements support long-term supply chain continuity and enhanced performance.

Q: Is the substitute backward compatible with existing designs?

A: Functionally, yes—both parts share the same SPI interface, command set, and memory organization. However, physical compatibility depends on PCB layout. The different package dimensions (8-VDFN vs. 8-UDFN) require verification that the substitute footprint fits your existing PCB or that PCB redesign is feasible.

Q: What is the moisture sensitivity difference, and why does it matter?

A: The main part has MSL 3 (168-hour floor life after moisture exposure), while the substitute has MSL 1 (unlimited floor life). MSL 1 provides superior reliability in humid environments and allows longer storage without baking. This is particularly important for supply chain logistics and manufacturing environments with variable humidity.