AT45DB011D-MH-SL955 Equivalent & Substitute Parts

Part Overview

The AT45DB011D-MH-SL955 is a 1Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation, designed for non-volatile data storage applications requiring 66 MHz operation. The device is packaged in an 8-UDFN (5x6) surface mount configuration with an exposed pad.

This part is classified as Obsolete, making identification of functionally compatible alternatives essential for ongoing system support, design updates, and production continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface protocol, voltage specifications, and thermal operating range while accommodating the same physical footprint.

Substiute Parts

AT45DB011D-MH-SL955

Renesas Electronics CorporationIn Stock: 1199AT45DB011D-MH-SL955 Datasheet

Current PartRFQ

AT45DB021E-MHN2B-T

Renesas Electronics CorporationIn Stock: 1981AT45DB021E-MHN2B-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT45DB011D-MH-SL955 is determined by the following critical parameters:

Interface Compatibility: The SPI protocol must be maintained to ensure firmware and hardware interface compatibility without modification to existing control logic.

Package Compatibility: The 8-UDFN (5x6) exposed pad package ensures mechanical and thermal compatibility with existing PCB layouts and soldering processes.

Voltage Compatibility: The supply voltage range must overlap or be contained within the original specification (2.7V ~ 3.6V) to maintain safe operation within existing power distribution systems.

Operating Temperature Range: The thermal operating range (-40°C ~ 85°C) must be met or exceeded to ensure reliability across the intended application environment.

Memory Organization: While memory capacity may increase, the page size (256 Bytes) and addressing scheme must remain compatible with firmware implementation.

The AT45DB021E-MHN2B-T qualifies as a direct substitute based on these criteria: it maintains SPI interface protocol, identical package configuration, overlapping voltage specifications (1.65V ~ 3.6V), matching thermal range, and compatible memory organization with increased capacity (2Mbit) and enhanced clock frequency (70 MHz).

Parameter Comparison

Engineering Selection Recommendations

The AT45DB021E-MHN2B-T is the qualified substitute for the obsolete AT45DB011D-MH-SL955. Selection is based on the following engineering criteria:

Product Status: The substitute part maintains Active product status, ensuring long-term availability, manufacturing support, and supply chain continuity compared to the Obsolete original part.

Compliance & Certifications: Both parts share identical REACH Status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8542.32.0071). The substitute part carries RoHS3 Compliance certification, meeting current regulatory requirements for electronic components.

Electrical Compatibility: The substitute part operates within the original voltage specification range and exceeds clock frequency and write cycle time performance, providing enhanced operational capability without degradation of existing system requirements.

Physical Compatibility: Identical package configuration (8-UDFN 5x6 exposed pad) and mounting type (Surface Mount) ensure direct PCB layout compatibility and soldering process alignment.

Frequently Asked Questions (FAQ)

Q: Can the AT45DB021E-MHN2B-T be used as a direct replacement without firmware modification?

A: Yes. Both parts implement the SPI protocol with compatible memory organization (256-byte page structure). The increased memory capacity (2Mbit vs. 1Mbit) and faster write cycle time (3ms vs. 4ms) are backward compatible. Firmware addressing schemes remain valid across the expanded memory space.

Q: What is the difference in memory organization between these parts?

A: The AT45DB011D-MH-SL955 provides 256 Bytes x 512 pages (1Mbit total). The AT45DB021E-MHN2B-T provides 264 Bytes x 1024 pages (2Mbit total). The page size increase from 256 to 264 bytes is a standard architectural change in the AT45DB series and is handled transparently by the SPI interface protocol.

Q: Are there packaging differences between these parts?

A: Both parts use identical 8-UDFN (5x6) surface mount packages with exposed pads. No PCB layout modifications are required for substitution.

Q: What is the voltage compatibility range?

A: The original part operates at 2.7V ~ 3.6V. The substitute part operates at 1.65V ~ 3.6V, providing extended low-voltage capability. Systems designed for the original 2.7V ~ 3.6V range operate safely with the substitute part.

Q: Does the substitute part meet current regulatory requirements?

A: Yes. The AT45DB021E-MHN2B-T carries RoHS3 Compliance certification and maintains REACH Unaffected status, meeting current electronic component regulatory standards.