AT25SF041-SSHD-T Equivalent & Substitute Parts

Part Overview

The AT25SF041-SSHD-T is a 4Mbit NOR Flash memory IC with SPI Quad I/O interface manufactured by Renesas Electronics Corporation. This part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates at 104 MHz clock frequency in an 8-SOIC surface mount package and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time - Word / Page	5µs / 2.5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT25SF041-SSHD-T is determined by the following critical parameters:

Memory Size: 4Mbit (fixed requirement)
Package Type: 8-SOIC form factor (mechanical compatibility)
Memory Interface: SPI - Quad I/O capability (functional requirement)
Voltage Supply Range: Must encompass or be compatible with 2.5V ~ 3.6V
Operating Temperature Range: Must support -40°C ~ 85°C minimum
Clock Frequency: 104 MHz or higher (performance compatibility)

Substitute parts are grouped into two categories:

Category A - Direct Quad I/O Substitutes: Parts maintaining SPI - Quad I/O interface with equivalent or superior clock frequency and compatible voltage/temperature specifications.

Category B - SPI Interface Substitutes: Parts with standard SPI interface (non-Quad) that maintain 4Mbit capacity and 8-SOIC packaging but operate at reduced clock frequencies or with different voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Memory Interface	Clock Frequency	Voltage Supply	Operating Temp	Product Status	Package
AT25SF041-SSHD-T	Renesas	SPI - Quad I/O	104 MHz	2.5V ~ 3.6V	-40°C ~ 85°C	Obsolete	8-SOIC
AT25SF041B-SSHD-T	Renesas	SPI - Quad I/O	108 MHz	2.5V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25FF041A-SSHN-T	Renesas	SPI - Quad I/O	104 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25SF041B-SSHB-T	Adesto Technologies	SPI - Quad I/O	108 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
W25Q40CLSNIG	Winbond Electronics	SPI - Quad I/O	104 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25DF041B-SSHN-B	Renesas	SPI	104 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25DF041B-SSHNHR-T	Renesas	SPI	85 MHz	1.7V ~ 3.6V	-40°C ~ 125°C	Active	8-SOIC
AT25XE041B-SSHN-B	Renesas	SPI	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25XE041B-SSHN-T	Renesas	SPI	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC
AT25XE041B-SSHNHR-T	Renesas	SPI	85 MHz	1.65V ~ 3.6V	-40°C ~ 125°C	Active	8-SOIC
LE25U40CMC-AH	onsemi	SPI	40 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	Active	8-SOIC

Engineering Selection Recommendations

Primary Substitutes (Active Status, Quad I/O Interface):

AT25SF041B-SSHD-T and AT25SF041B-SSHB-T are the preferred direct replacements. Both maintain SPI - Quad I/O functionality with clock frequencies of 108 MHz, exceeding the original 104 MHz specification. Both are ROHS3 compliant and carry Active product status. AT25SF041B-SSHD-T is manufactured by Renesas with identical voltage specifications (2.5V ~ 3.6V). AT25SF041B-SSHB-T is manufactured by Adesto Technologies with a minimum voltage of 2.7V, which remains compatible with the original 2.5V ~ 3.6V range for applications operating above 2.7V.

AT25FF041A-SSHN-T provides Quad I/O functionality with extended voltage range (1.65V ~ 3.6V) and is Active status. This part supports lower supply voltages while maintaining 104 MHz clock frequency and ROHS3 compliance.

W25Q40CLSNIG (Winbond Electronics) offers Quad I/O interface at 104 MHz with extended voltage range (2.3V ~ 3.6V) and Active product status. This part is verified as programmable and ROHS3 compliant.

Secondary Substitutes (Active Status, Standard SPI Interface):

AT25DF041B-SSHN-B operates at 104 MHz with standard SPI interface and extended voltage range (1.65V ~ 3.6V). This part sacrifices Quad I/O capability but maintains clock frequency and is ROHS3 compliant.

AT25DF041B-SSHNHR-T provides extended operating temperature range (-40°C ~ 125°C) with standard SPI interface at 85 MHz. This part is suitable for applications requiring higher temperature operation.

AT25XE041B variants (SSHN-B, SSHN-T, SSHNHR-T) operate at 85 MHz with standard SPI interface and extended voltage range (1.65V ~ 3.6V). The SSHNHR-T variant extends operating temperature to 125°C.

Limited Substitutes (Reduced Clock Frequency):

LE25U40CMC-AH (onsemi) operates at 40 MHz with standard SPI interface. This part is suitable only for applications where reduced clock frequency is acceptable. Moisture sensitivity level is 3 (168 Hours), compared to MSL 1 for other parts.

Frequently Asked Questions (FAQ)

Q: Can AT25SF041B-SSHD-T directly replace AT25SF041-SSHD-T?

A: Yes. Both parts maintain SPI - Quad I/O interface, 4Mbit capacity, 8-SOIC packaging, and -40°C ~ 85°C operating temperature. AT25SF041B-SSHD-T operates at 108 MHz versus 104 MHz, providing improved performance. Voltage specifications are identical (2.5V ~ 3.6V). Both are ROHS3 compliant.

Q: What is the difference between Quad I/O and standard SPI substitutes?

A: Quad I/O parts (AT25SF041B-SSHD-T, AT25FF041A-SSHN-T, W25Q40CLSNIG) support four-line data transfer, enabling higher data throughput. Standard SPI parts (AT25DF041B, AT25XE041B series) use single-line data transfer. Applications designed for Quad I/O require compatible controller support; standard SPI substitutes are suitable only if the application can operate at reduced data rates or if the controller supports both modes.

Q: Are there voltage compatibility concerns with substitute parts?

A: The original AT25SF041-SSHD-T operates at 2.5V ~ 3.6V. Substitutes with extended lower voltage ranges (1.65V ~ 3.6V) are fully compatible. Substitutes with higher minimum voltages (2.7V, 2.3V) remain compatible for applications operating above their minimum threshold. Verify system supply voltage specifications before selection.

Q: Which substitute supports the widest operating temperature range?

A: AT25DF041B-SSHNHR-T and AT25XE041B-SSHNHR-T both support -40°C ~ 125°C, extending 40°C above the original specification. These parts are suitable for high-temperature applications. Both operate at 85 MHz with standard SPI interface.

Q: What is the impact of reduced clock frequency on substitute selection?

A: LE25U40CMC-AH operates at 40 MHz, significantly below the original 104 MHz. This part is suitable only for applications where data throughput requirements are low or where the controller can tolerate reduced clock speeds. Higher-frequency substitutes (85 MHz and above) are preferred for performance-critical applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original AT25SF041-SSHD-T specification.

Q: What packaging options are available for substitutes?

A: All substitute parts use 8-SOIC (0.154", 3.90mm Width) packaging, ensuring mechanical compatibility with the original part. Packaging variants (Cut Tape, Tape & Reel, Tube) differ only in supply format and do not affect electrical or mechanical compatibility.

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