AT45DB081D-MU-2.5 Equivalent & Substitute Parts

Part Overview

The AT45DB081D-MU-2.5 is an 8Mbit FLASH memory IC with SPI interface operating at 50 MHz, manufactured by Renesas Electronics Corporation. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. The part is packaged in 8-VDFN (6x5) with exposed pad and operates across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	50 MHz
Memory Organization	264 Bytes x 4096 pages
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VDFN Exposed Pad (6x5)
Write Cycle Time (Page)	4ms
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT45DB081D-MU-2.5 is determined by the following critical parameters:

Memory Capacity: Must be 8Mbit to maintain functional equivalence
Memory Interface: Must be SPI to ensure protocol compatibility
Memory Organization: Must be 264 Bytes x 4096 pages for address mapping compatibility
Voltage Supply Range: Substitute must support the operating voltage window of the original design
Operating Temperature Range: Must cover -40°C to 85°C minimum
Package Compatibility: Physical dimensions and pin configuration must be compatible with PCB layout

The AT45DB081E-MHN-Y qualifies as a direct substitute based on identical memory capacity, organization, interface protocol, and temperature range. Enhanced specifications (85 MHz clock frequency, wider voltage range, improved MSL rating) provide superior performance characteristics while maintaining full backward compatibility.

Parameter Comparison

Parameter	AT45DB081D-MU-2.5 (Main)	AT45DB081E-MHN-Y (Substitute)
Memory Size	8Mbit	8Mbit
Memory Format	FLASH	FLASH
Memory Interface	SPI	SPI
Clock Frequency	50 MHz	85 MHz
Memory Organization	264 Bytes x 4096 pages	264 Bytes x 4096 pages
Voltage Supply Range	2.5V ~ 3.6V	1.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-VDFN (6x5)	8-UDFN (5x6)
Write Cycle Time (Page)	4ms	4ms
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

The AT45DB081E-MHN-Y is the qualified substitute for AT45DB081D-MU-2.5 applications. Selection is based on:

Product Status: The substitute is active production, ensuring long-term availability and supply chain stability compared to the obsolete main part
Compliance: The substitute meets ROHS3 compliance and REACH unaffected status, satisfying modern regulatory requirements
Functional Compatibility: Identical memory capacity, organization, and SPI interface ensure drop-in compatibility at the firmware level
Enhanced Specifications: Higher clock frequency (85 MHz vs 50 MHz) and extended voltage range (1.7V minimum vs 2.5V minimum) provide operational margin
Improved Reliability: MSL 1 rating eliminates moisture sensitivity constraints during storage and handling

Package geometry differs (8-VDFN 6x5 vs 8-UDFN 5x6); PCB layout verification is required to confirm physical fit within existing footprints.

Frequently Asked Questions (FAQ)

Q: Can AT45DB081E-MHN-Y replace AT45DB081D-MU-2.5 in existing designs?

A: Yes. Both devices share identical memory capacity (8Mbit), organization (264 Bytes x 4096 pages), SPI interface, and operating temperature range (-40°C to 85°C). The substitute operates within the original supply voltage window (2.5V ~ 3.6V) and maintains 4ms page write cycle time. Physical package dimensions differ; PCB layout compatibility must be confirmed.

Q: What are the key differences between these parts?

A: The substitute offers higher clock frequency (85 MHz vs 50 MHz), extended minimum supply voltage (1.7V vs 2.5V), improved moisture sensitivity rating (MSL 1 vs MSL 3), and active product status versus obsolete. Package footprints differ: 8-VDFN (6x5) versus 8-UDFN (5x6).

Q: Is the package change from 8-VDFN to 8-UDFN a concern?

A: Package dimensions differ (6x5mm vs 5x6mm). Existing PCB layouts designed for 8-VDFN may require modification to accommodate 8-UDFN. Pin configuration and electrical characteristics remain compatible; physical placement verification is necessary.

Q: Does the higher clock frequency affect firmware compatibility?

A: No. The substitute operates at 85 MHz maximum, which is backward compatible with designs clocked at 50 MHz. Firmware requires no modification; the device operates at reduced frequency if the system clock is limited to 50 MHz.

Q: What compliance certifications apply to the substitute?

A: AT45DB081E-MHN-Y is ROHS3 compliant and REACH unaffected. Both parts carry EAR99 export classification and HTSUS code 8542.32.0071.

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