AT45DB011D-MH-SL954 Equivalent & Substitute Parts

Part Overview

The AT45DB011D-MH-SL954 is a 1Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, featuring SPI interface operation at 66 MHz. This device is packaged in an 8-UDFN (5x6) surface mount configuration with exposed pad. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT45DB011D-MH-SL954
Manufacturer	Renesas Electronics Corporation
Memory Size	1Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	66 MHz
Memory Organization	256 Bytes x 512 pages
Write Cycle Time	4ms (Page)
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

Physical Compatibility:

Package type: 8-UDFN Exposed Pad (5x6) form factor
Mounting type: Surface Mount
Pin count and layout: 8-pin configuration

Electrical Compatibility:

Memory interface: SPI protocol
Voltage supply range: Must accommodate 2.7V ~ 3.6V operation
Operating temperature range: -40°C ~ 85°C
Clock frequency: Minimum 66 MHz operation capability

Functional Compatibility:

Memory type: Non-Volatile FLASH
Memory organization: Page-based architecture with byte-level access

The AT45DB021E-MHN2B-T qualifies as a direct substitute based on matching package geometry, SPI interface protocol, compatible voltage supply range, and identical operating temperature specifications. The substitute part maintains the same physical footprint and electrical interface requirements while offering enhanced performance characteristics.

Parameter Comparison

Parameter	AT45DB011D-MH-SL954	AT45DB021E-MHN2B-T	Compatibility
Memory Size	1Mbit	2Mbit	Substitute offers increased capacity
Memory Organization	256 Bytes x 512 pages	264 Bytes x 1024 pages	Compatible page-based architecture
Memory Interface	SPI	SPI	Identical
Clock Frequency	66 MHz	70 MHz	Substitute exceeds minimum requirement
Write Cycle Time	4ms (Page)	3ms (Page)	Substitute offers faster write performance
Voltage Supply Range	2.7V ~ 3.6V	1.65V ~ 3.6V	Substitute supports extended lower voltage
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package / Case	8-UDFN Exposed Pad (5x6)	8-UDFN Exposed Pad (5x6)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	Not specified	ROHS3 Compliant	Substitute meets current compliance

Engineering Selection Recommendations

The AT45DB021E-MHN2B-T is the qualified substitute for the obsolete AT45DB011D-MH-SL954 based on the following engineering criteria:

Product Lifecycle Status: The original part is obsolete, while the substitute is in active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The substitute part carries ROHS3 compliance certification, meeting current environmental and regulatory requirements for electronic components.

Physical Integration: Both parts share identical package geometry (8-UDFN Exposed Pad, 5x6 dimensions) and surface mount configuration, enabling direct PCB footprint compatibility without layout modifications.

Electrical Interface: Both parts operate on SPI protocol with compatible voltage supply ranges and identical operating temperature specifications, ensuring firmware and hardware interface compatibility.

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

Frequently Asked Questions (FAQ)

Q: Can the AT45DB021E-MHN2B-T be used as a direct replacement for the AT45DB011D-MH-SL954?

A: Yes. Both parts share identical package geometry (8-UDFN Exposed Pad, 5x6), surface mount configuration, SPI interface protocol, and operating temperature range (-40°C ~ 85°C). The substitute part is electrically and physically compatible with the original design.

Q: What are the key differences between these two parts?

A: The substitute part offers 2Mbit memory capacity compared to 1Mbit in the original, operates at 70 MHz versus 66 MHz, and features a faster page write cycle time of 3ms versus 4ms. The substitute also supports an extended lower voltage range (1.65V minimum versus 2.7V minimum).

Q: Does the increased memory capacity of the substitute part affect compatibility?

A: No. The increased capacity does not impact compatibility. The substitute maintains the same SPI interface protocol and page-based memory organization. Firmware and hardware interfaces remain compatible.

Q: Are there packaging differences between these parts?

A: No. Both parts use identical 8-UDFN Exposed Pad packaging (5x6 dimensions) with surface mount configuration. PCB footprints are identical.

Q: What is the significance of the substitute part being ROHS3 compliant?

A: ROHS3 compliance indicates the substitute part meets current environmental and regulatory requirements for electronic components in the European Union and other regulated markets. This ensures compliance with modern procurement and manufacturing standards.

Q: Can the substitute part operate at the same voltage levels as the original?

A: Yes. The substitute part supports the original voltage range of 2.7V ~ 3.6V and extends compatibility to lower voltages down to 1.65V, providing greater flexibility in power supply design.

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