AT45DB081D-MU-SL955 Equivalent & Substitute Parts

Part Overview

The AT45DB081D-MU-SL955 is an 8Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in an 8-VDFN (6x5) surface mount configuration. This device operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and supports a 4ms page write cycle time. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and production continuity.

Substiute Parts

AT45DB081D-MU-SL955

Renesas Electronics CorporationIn Stock: 717AT45DB081D-MU-SL955 Datasheet

Current PartRFQ

AT45DB081E-MHN2B-T

Renesas Electronics CorporationIn Stock: 2052AT45DB081E-MHN2B-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT45DB081D-MU-SL955 is determined by the following critical parameters:

• Memory Capacity: 8Mbit (non-negotiable for data storage compatibility)
• Memory Interface: SPI (required for protocol compatibility with existing host controllers)
• Memory Organization: 256 Bytes x 4096 pages (ensures address mapping and access pattern compatibility)
• Operating Temperature Range: -40°C ~ 85°C (maintains thermal operating envelope)
• Supply Voltage Compatibility: Substitute must operate within or encompass the original 2.7V ~ 3.6V range

The AT45DB081E-MHN2B-T qualifies as a direct substitute based on these parameters. While it features an enhanced clock frequency (85 MHz versus 66 MHz) and improved package moisture sensitivity (MSL 1 versus MSL 3), these represent performance and reliability improvements rather than incompatibilities. The substitute maintains identical memory capacity, organization, interface protocol, and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

The AT45DB081E-MHN2B-T is the qualified substitute for the obsolete AT45DB081D-MU-SL955. Selection is supported by the following factors:

• Product Status: The substitute is Active, ensuring continued availability and manufacturing support, whereas the main part is Obsolete.
• Regulatory Compliance: The substitute is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.
• Functional Equivalence: Identical memory capacity, organization, interface protocol, and thermal operating range ensure drop-in compatibility at the functional level.
• Enhanced Specifications: The substitute provides extended supply voltage range (1.7V ~ 3.6V) and superior moisture sensitivity rating (MSL 1), representing improvements over the original specification.
• Package Consideration: The substitute uses 8-UDFN (5x6) packaging versus the original 8-VDFN (6x5). Physical footprint verification is required during PCB layout assessment.

Frequently Asked Questions (FAQ)

Q: Can the AT45DB081E-MHN2B-T be used as a direct replacement for the AT45DB081D-MU-SL955?

A: Yes, at the functional and protocol level. Both devices share identical 8Mbit capacity, SPI interface, memory organization, and thermal specifications. However, the package footprint differs (8-UDFN 5x6 versus 8-VDFN 6x5), requiring PCB layout verification before implementation.

Q: What is the significance of the different package types?

A: The main part uses 8-VDFN (6x5mm) while the substitute uses 8-UDFN (5x6mm). Although both are 8-pin packages with exposed pads, the physical dimensions and pin layout differ. PCB footprint compatibility must be confirmed; direct soldering without layout modification is not guaranteed.

Q: Does the higher clock frequency of the substitute affect compatibility?

A: No. The substitute's 85 MHz clock frequency is a performance enhancement. Systems designed for 66 MHz operation will function correctly with the 85 MHz device, as the substitute supports the original operating frequency and exceeds it.

Q: What does the improved Moisture Sensitivity Level (MSL 1 versus MSL 3) mean?

A: MSL 1 indicates unlimited shelf life under controlled humidity conditions, whereas MSL 3 limits shelf life to 168 hours. The substitute offers superior moisture resistance and longer storage capability without degradation.

Q: Is the extended supply voltage range (1.7V ~ 3.6V) of the substitute a concern?

A: No. The substitute's wider voltage range encompasses the original 2.7V ~ 3.6V specification. Systems operating within the original voltage window will function identically with the substitute.

Q: Are there any compliance differences between the two parts?

A: Yes. The substitute is ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations. The original part's compliance status is not specified. For new designs or regulated applications, the substitute's compliance certifications are advantageous.