AT45DB011D-SH-SL954 Equivalent & Substitute Parts

Part Overview

The AT45DB011D-SH-SL954 is a 1Mbit FLASH memory IC with SPI interface operating at 66 MHz, manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. The part's non-volatile FLASH memory architecture and SPI communication protocol define the baseline requirements for functional equivalency.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	66 MHz
Memory Organization	256 Bytes x 512 pages
Write Cycle Time - Page	4ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT45DB011D-SH-SL954 is determined by the following critical parameters:

Interface Compatibility: The SPI protocol must be maintained to ensure software and hardware compatibility with existing controller implementations.

Package Compatibility: The 8-SOIC surface mount package with 5.30mm width must be preserved to maintain PCB layout and assembly process compatibility.

Voltage Supply Range: The substitute must operate within or encompass the 2.7V ~ 3.6V supply voltage window.

Operating Temperature Range: The substitute must support the -40°C ~ 85°C operating temperature specification.

Memory Organization: While memory size may increase, the 256-byte page organization and SPI command set compatibility are required for firmware compatibility.

The AT45DB021E-SHN2B-T meets these substitution criteria while offering enhanced specifications in memory capacity and performance characteristics.

Parameter Comparison

Parameter	AT45DB011D-SH-SL954	AT45DB021E-SHN2B-T	Compatibility Notes
Memory Size	1Mbit	2Mbit	Increased capacity; backward compatible
Memory Format	FLASH	FLASH	Identical
Memory Interface	SPI	SPI	Identical
Clock Frequency	66 MHz	70 MHz	Higher frequency; backward compatible
Memory Organization	256 Bytes x 512 pages	256 Bytes x 1024 pages	Same page size; doubled page count
Write Cycle Time - Page	4ms	3ms	Improved performance
Voltage Supply Range	2.7V ~ 3.6V	1.65V ~ 3.6V	Wider range; fully compatible
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	Substitute is in active production

Engineering Selection Recommendations

The AT45DB021E-SHN2B-T is the designated manufacturer-recommended substitute for the obsolete AT45DB011D-SH-SL954. Selection of this substitute is supported by the following factors:

Product Status: The AT45DB021E-SHN2B-T maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Compliance Certification: The substitute is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Backward Compatibility: The identical SPI interface, package footprint, and operating temperature range ensure functional compatibility with existing designs without requiring PCB modifications or firmware rewrites.

Performance Enhancement: The substitute provides increased memory capacity (2Mbit vs. 1Mbit), faster clock frequency (70 MHz vs. 66 MHz), and improved write cycle time (3ms vs. 4ms), delivering superior performance characteristics within the same physical and electrical constraints.

Frequently Asked Questions (FAQ)

Q: Can the AT45DB021E-SHN2B-T be used as a direct replacement on existing PCBs designed for the AT45DB011D-SH-SL954?

A: Yes. Both parts use identical 8-SOIC packaging with 5.30mm width and the same pin configuration. No PCB layout modifications are required.

Q: Will existing firmware operate without modification when using the AT45DB021E-SHN2B-T?

A: Yes. The SPI interface protocol and 256-byte page organization are identical. The increased memory capacity (2Mbit) is transparent to firmware that addresses only the original 1Mbit address space. Firmware can be updated to utilize the additional memory capacity if desired.

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

A: The AT45DB011D-SH-SL954 operates at 2.7V ~ 3.6V. The AT45DB021E-SHN2B-T operates at 1.65V ~ 3.6V, providing a wider supply voltage range. Both parts are fully compatible with 3.3V and 2.7V supply systems.

Q: Are there differences in operating temperature specifications?

A: No. Both parts operate across the identical -40°C ~ 85°C temperature range, ensuring thermal compatibility in all application environments.

Q: What is the significance of the higher clock frequency in the substitute part?

A: The AT45DB021E-SHN2B-T operates at 70 MHz compared to 66 MHz in the original part. This higher frequency is backward compatible and does not require controller modifications. Systems designed for 66 MHz operation will function correctly at the higher frequency.

Q: Is the AT45DB021E-SHN2B-T the only available substitute?

A: According to the manufacturer data provided, the AT45DB021E-SHN2B-T is the designated substitute. This part is currently in active production with verified programmability status.

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