AT25SF041-SHD-B Equivalent & Substitute Parts

Part Overview

The AT25SF041-SHD-B is a 4Mbit NOR Flash memory IC manufactured by Renesas Electronics Corporation, featuring SPI with Quad I/O interface capability at 104 MHz operation. This component is packaged in 8-SOIC form factor and operates across the -40°C to 85°C temperature range with 2.5V to 3.6V supply voltage compatibility.

The AT25SF041-SHD-B has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Package / Case	8-SOIC (0.209", 5.30mm Width)
Voltage - Supply	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT25SF041-SHD-B are selected based on the following critical parameters that determine functional compatibility:

Memory Capacity: 4Mbit (512K x 8 organization)
Package Type: 8-SOIC form factor with identical 5.30mm width
Memory Interface: SPI protocol support (Quad I/O capability preferred for full compatibility)
Clock Frequency: Minimum 104 MHz operation
Supply Voltage Range: Overlap with 2.5V ~ 3.6V specification
Operating Temperature: -40°C to 85°C range support
RoHS Compliance: ROHS3 Compliant status

The substitute parts identified maintain these core electrical and mechanical parameters, ensuring pin-compatible replacement capability within the specified operating conditions.

Parameter Comparison

Parameter	AT25SF041-SHD-B (Main)	SST25VF040B-50-4I-S2AF-T	W25Q40CLSSIG	W25X40CLSSIG
Manufacturer	Renesas Electronics	Microchip Technology	Winbond Electronics	Winbond Electronics
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8
Memory Interface	SPI - Quad I/O	SPI	SPI - Quad I/O	SPI
Clock Frequency	104 MHz	50 MHz	104 MHz	104 MHz
Package / Case	8-SOIC (5.30mm)	8-SOIC (5.30mm)	8-SOIC (5.30mm)	8-SOIC (5.30mm)
Voltage - Supply	2.5V ~ 3.6V	2.7V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

W25X40CLSSIG (Winbond Electronics) represents the primary substitute option. This part maintains full electrical and mechanical compatibility with the AT25SF041-SHD-B, including identical 104 MHz clock frequency, SPI interface support, matching 8-SOIC package dimensions, and overlapping supply voltage range. The W25X40CLSSIG carries active product status with ROHS3 compliance and verified programmability certification.

W25Q40CLSSIG (Winbond Electronics) provides an alternative with Quad I/O interface capability matching the original part's advanced functionality. This part operates at 104 MHz with identical package specifications and temperature range. Active product status and ROHS3 compliance support long-term availability.

SST25VF040B-50-4I-S2AF-T (Microchip Technology) offers a functional substitute with 4Mbit capacity and 8-SOIC packaging. The 50 MHz clock frequency represents a reduced operational speed compared to the original 104 MHz specification. This part maintains ROHS3 compliance and active product status but operates at lower performance levels.

All three substitute parts maintain ROHS3 compliance and active product status, supporting regulatory requirements and supply chain continuity for applications requiring the AT25SF041-SHD-B.

Frequently Asked Questions (FAQ)

Q: Can W25X40CLSSIG directly replace AT25SF041-SHD-B in existing designs?

A: Yes. Both parts share identical 4Mbit capacity, 512K x 8 organization, 8-SOIC package dimensions (5.30mm width), 104 MHz clock frequency, and overlapping -40°C to 85°C operating temperature range. Pin compatibility and electrical characteristics support direct substitution.

Q: What is the significance of the Quad I/O interface difference between substitutes?

A: The AT25SF041-SHD-B and W25Q40CLSSIG feature SPI - Quad I/O interface, enabling four-line data transfer. The W25X40CLSSIG and SST25VF040B-50-4I-S2AF-T support standard SPI interface. Applications utilizing Quad I/O mode require W25Q40CLSSIG or W25X40CLSSIG for full feature compatibility, though standard SPI operation remains available on all parts.

Q: How does the 50 MHz clock frequency of SST25VF040B-50-4I-S2AF-T affect system performance?

A: The SST25VF040B-50-4I-S2AF-T operates at 50 MHz compared to the original 104 MHz specification. This represents a 52% reduction in maximum clock frequency. Applications requiring 104 MHz operation must select W25X40CLSSIG or W25Q40CLSSIG to maintain original performance specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry ROHS3 Compliant status, matching the original AT25SF041-SHD-B compliance certification.

Q: What supply voltage considerations apply to these substitutes?

A: The AT25SF041-SHD-B operates at 2.5V ~ 3.6V. The W25X40CLSSIG and W25Q40CLSSIG support 2.3V ~ 3.6V, providing broader low-voltage compatibility. The SST25VF040B-50-4I-S2AF-T operates at 2.7V ~ 3.6V. All parts support the original 3.3V nominal supply voltage.

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