AT26DF081A-SU Equivalent & Substitute Parts

Part Overview

The AT26DF081A-SU is an 8Mbit SPI FLASH memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring serial peripheral interface communication. This device operates at 70 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is housed in an 8-SOIC surface mount package. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	70 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT26DF081A-SU is determined by the following critical parameters:

Memory Capacity: 8Mbit (non-negotiable)
Memory Type: Non-volatile FLASH technology
Interface Protocol: SPI or SPI-compatible (Quad I/O SPI is backward compatible with standard SPI)
Package: 8-SOIC form factor with identical pin pitch and dimensions
Supply Voltage: 2.7V ~ 3.6V compatibility
RoHS Compliance: ROHS3 Compliant status

The substitute parts listed below meet these core electrical and mechanical requirements. Clock frequency variations are acceptable provided the substitute operates at or above the minimum system requirements. Operating temperature ranges may differ; selection depends on application-specific thermal constraints.

Parameter Comparison

Parameter	AT26DF081A-SU	SST25VF080B-50-4C-S2AF	SST25VF080B-50-4C-S2AF-T	SST25VF080B-50-4I-S2AF	W25Q80DVSSIG
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Winbond Electronics
Memory Size	8Mbit	8Mbit	8Mbit	8Mbit	8Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH	FLASH - NOR
Memory Interface	SPI	SPI	SPI	SPI	SPI - Quad I/O
Clock Frequency	70 MHz	50 MHz	50 MHz	50 MHz	104 MHz
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active

Engineering Selection Recommendations

SST25VF080B-50-4I-S2AF is the primary substitute for applications requiring full temperature range operation (-40°C ~ 85°C). This part maintains identical supply voltage specifications and operating temperature range as the original AT26DF081A-SU, ensuring compatibility with designs operating across extended thermal environments. The device is actively manufactured and verified for programmability.

W25Q80DVSSIG is suitable for applications where higher clock frequency (104 MHz) provides performance benefits and full temperature range operation is required. This Winbond device supports Quad I/O SPI mode while maintaining backward compatibility with standard SPI protocol. The higher clock frequency does not compromise compatibility with systems designed for the original 70 MHz part.

SST25VF080B-50-4C-S2AF and SST25VF080B-50-4C-S2AF-T are alternatives for applications constrained to 0°C ~ 70°C operating temperature ranges. These parts differ only in packaging format (Tube versus Cut Tape & Digi-Reel). Selection between these variants depends on procurement and assembly workflow requirements.

All substitute parts maintain ROHS3 compliance and identical 8-SOIC package dimensions, ensuring direct mechanical and electrical compatibility without circuit board redesign.

Frequently Asked Questions (FAQ)

Q: Can SST25VF080B-50-4I-S2AF directly replace AT26DF081A-SU without circuit modifications?

A: Yes. Both devices share identical 8-SOIC package geometry, pin configuration, supply voltage range (2.7V ~ 3.6V), and operating temperature range (-40°C ~ 85°C). The 50 MHz clock frequency of the SST25VF080B-50-4I-S2AF is lower than the original 70 MHz specification but is fully compatible with SPI interface timing requirements for the AT26DF081A-SU application.

Q: What is the difference between SST25VF080B-50-4C-S2AF and SST25VF080B-50-4C-S2AF-T?

A: Both parts are electrically identical 8Mbit SPI FLASH devices. The difference is packaging format: SST25VF080B-50-4C-S2AF is supplied in Tube packaging, while SST25VF080B-50-4C-S2AF-T is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Why does W25Q80DVSSIG operate at 104 MHz while the original part operates at 70 MHz?

A: W25Q80DVSSIG is a higher-performance variant from Winbond Electronics. The increased clock frequency does not create compatibility issues; systems designed for 70 MHz operation function correctly with 104 MHz devices. The higher frequency provides performance headroom for demanding applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SST25VF080B-50-4C-S2AF, SST25VF080B-50-4C-S2AF-T, SST25VF080B-50-4I-S2AF, and W25Q80DVSSIG) are ROHS3 compliant, matching the compliance status of the original AT26DF081A-SU.

Q: Which substitute should I select for applications requiring -40°C ~ 85°C operation?

A: SST25VF080B-50-4I-S2AF and W25Q80DVSSIG both support the full -40°C ~ 85°C operating temperature range. SST25VF080B-50-4C-S2AF and SST25VF080B-50-4C-S2AF-T are limited to 0°C ~ 70°C and are unsuitable for extended temperature applications.

Q: Is the SPI - Quad I/O interface of W25Q80DVSSIG compatible with standard SPI designs?

A: Yes. Quad I/O SPI is backward compatible with standard SPI protocol. W25Q80DVSSIG operates in standard SPI mode when configured for single I/O operation, ensuring compatibility with existing circuit designs without firmware modifications.

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