AT45DB081D-SU Equivalent & Substitute Parts

Part Overview

The AT45DB081D-SU is an 8Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Format	FLASH
Memory Interface	SPI
Memory Organization	264 Bytes x 4096 pages
Clock Frequency	66 MHz
Write Cycle Time (Page)	4ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT45DB081D-SU is based on the following critical parameters that must remain constant or compatible:

Memory capacity: 8Mbit (non-negotiable)
Memory format and technology: FLASH
Interface protocol: SPI
Memory organization: 264 Bytes x 4096 pages
Package type: 8-SOIC with identical physical dimensions
Operating temperature range: -40°C ~ 85°C
Mounting type: Surface Mount

The substitute parts identified (AT45DB081E-SHN-B, AT45DB081E-SHN-T, AT45DB081E-SHNHA-T) share the same base product number AT45DB081 and maintain all critical electrical and mechanical parameters. These parts represent active production alternatives with enhanced specifications, specifically improved clock frequency (85 MHz versus 66 MHz) and extended supply voltage compatibility (1.7V ~ 3.6V versus 2.7V ~ 3.6V). The identical memory organization, page write cycle time, and package specifications ensure direct functional compatibility.

Parameter Comparison

Parameter	AT45DB081D-SU (Main)	AT45DB081E-SHN-B	AT45DB081E-SHN-T	AT45DB081E-SHNHA-T
Memory Size	8Mbit	8Mbit	8Mbit	8Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	SPI	SPI	SPI
Memory Organization	264 Bytes x 4096 pages	264 Bytes x 4096 pages	264 Bytes x 4096 pages	264 Bytes x 4096 pages
Clock Frequency	66 MHz	85 MHz	85 MHz	85 MHz
Write Cycle Time (Page)	4ms	4ms	4ms	4ms
Voltage Supply Range	2.7V ~ 3.6V	1.7V ~ 3.6V	1.7V ~ 3.6V	1.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three substitute parts (AT45DB081E-SHN-B, AT45DB081E-SHN-T, AT45DB081E-SHNHA-T) are active production components manufactured by Renesas Electronics Corporation and are suitable replacements for the obsolete AT45DB081D-SU. The substitute parts offer improved specifications including higher clock frequency (85 MHz) and wider supply voltage range (1.7V ~ 3.6V), providing enhanced performance margins and greater design flexibility.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. Selection among the three substitute options should be based on packaging requirements: AT45DB081E-SHN-B is supplied in Tube packaging, AT45DB081E-SHN-T is supplied in Cut Tape and Digi-Reel format, and AT45DB081E-SHNHA-T is supplied in Tape & Reel format. Inventory availability and procurement logistics may also influence the selection among these functionally equivalent alternatives.

Frequently Asked Questions (FAQ)

Q: Can AT45DB081E series parts directly replace the AT45DB081D-SU?

A: Yes. The AT45DB081E series parts maintain identical memory capacity (8Mbit), memory organization (264 Bytes x 4096 pages), SPI interface, package type (8-SOIC), and operating temperature range (-40°C to 85°C). The higher clock frequency (85 MHz) and extended supply voltage range (1.7V ~ 3.6V) of the substitute parts are backward compatible with designs specified for the original part.

Q: What is the difference between AT45DB081E-SHN-B, AT45DB081E-SHN-T, and AT45DB081E-SHNHA-T?

A: These three parts are electrically and functionally identical. The differences are in packaging format: SHN-B is Tube packaging, SHN-T is Cut Tape and Digi-Reel format, and SHNHA-T is Tape & Reel format. Selection depends on production volume requirements and procurement preferences.

Q: Are the substitute parts pin-compatible with the original AT45DB081D-SU?

A: Yes. All parts use the same 8-SOIC package with identical pin configuration and physical dimensions (0.209" width, 5.30mm).

Q: Do the substitute parts require any design modifications?

A: No design modifications are required. The substitute parts operate within the same voltage and temperature ranges as the original part and maintain full SPI protocol compatibility.

Q: What is the significance of the higher 85 MHz clock frequency in the substitute parts?

A: The 85 MHz specification in the substitute parts represents an improved performance specification compared to the original 66 MHz. This provides additional performance margin and does not require any design changes for applications originally specified at 66 MHz.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

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