AT25DF041A-SSH-T Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SSH-T is a 4Mbit SPI Flash memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and supports standard SPI interface protocols for embedded systems requiring non-volatile memory storage.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	70 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time (Word, Page)	7µs, 5ms
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF041A-SSH-T is determined by the following critical parameters:

Memory Size: 4Mbit (fixed requirement)
Memory Organization: 512K x 8 (fixed requirement)
Memory Interface: SPI (fixed requirement)
Package / Case: 8-SOIC (fixed requirement)
Voltage Supply Range: Must encompass or be compatible with 2.7V ~ 3.6V
Operating Temperature: Must support minimum -40°C ~ 85°C range
Clock Frequency: 70 MHz or higher acceptable for direct substitution

All substitute parts listed maintain identical memory capacity, organization, interface protocol, and physical package dimensions. Variations in clock frequency, voltage range, and temperature rating are acceptable provided they meet or exceed the original specifications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Product Status
AT25DF041A-SSH-T	Renesas Electronics	4Mbit	70 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Obsolete
AT25DF041B-SSHN-B	Renesas Electronics	4Mbit	104 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
AT25DF041B-SSHNHR-T	Renesas Electronics	4Mbit	85 MHz	1.7V ~ 3.6V	-40°C ~ 125°C	8-SOIC	Active
AT25XE041B-SSHN-B	Renesas Electronics	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
AT25XE041B-SSHN-T	Renesas Electronics	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
AT25XE041B-SSHNHR-T	Renesas Electronics	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 125°C	8-SOIC	Active
LE25U40CMC-AH	onsemi	4Mbit	40 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SST25VF040B-50-4I-SAE	Microchip Technology	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SST25VF040B-50-4I-SAE-T	Microchip Technology	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SST25VF040B-50-4I-SAF	Microchip Technology	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SST25VF040B-50-4I-SAF-T	Microchip Technology	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status with ROHS3 compliance and REACH unaffected certification, ensuring regulatory alignment for current production environments. The Renesas AT25DF041B and AT25XE041 series provide direct manufacturer lineage with enhanced performance specifications, including higher clock frequencies and extended temperature ranges in select variants.

The AT25DF041B-SSHNHR-T and AT25XE041B-SSHNHR-T variants support extended operating temperatures to 125°C, suitable for industrial applications. The AT25DF041B-SSHN-B offers the highest clock frequency at 104 MHz with active status and verified programmability certification.

For applications with lower frequency requirements, the Microchip SST25VF040B series and onsemi LE25U40CMC-AH provide alternative sourcing with equivalent memory specifications and 8-SOIC packaging. The SST25VF040B variants maintain identical voltage supply range to the original part (2.7V ~ 3.6V).

Frequently Asked Questions (FAQ)

Q: Can AT25DF041B-SSHN-B directly replace AT25DF041A-SSH-T?

A: Yes. Both devices share identical memory capacity (4Mbit), organization (512K x 8), SPI interface, and 8-SOIC package. The AT25DF041B-SSHN-B operates at 104 MHz, exceeding the original 70 MHz specification, and supports the required voltage range. The substitute is active status with verified programmability.

Q: What is the difference between AT25XE041B and AT25DF041B variants?

A: Both series maintain 4Mbit capacity and SPI interface in 8-SOIC packages. The AT25XE041B variants operate at 85 MHz with lower minimum voltage (1.65V) compared to AT25DF041B at 104 MHz (1.65V minimum). The AT25XE041B series is not verified for programmability by DiGi-Electronics.

Q: Are Microchip SST25VF040B parts compatible?

A: Yes. The SST25VF040B series maintains 4Mbit capacity, 512K x 8 organization, SPI interface, and 8-SOIC package. Clock frequency is 50 MHz and voltage supply range is 2.7V ~ 3.6V, matching the original specification. These parts are active status with ROHS3 compliance.

Q: Why does LE25U40CMC-AH have a lower clock frequency?

A: The LE25U40CMC-AH operates at 40 MHz, below the original 70 MHz specification. This part is suitable only for applications where lower clock frequency is acceptable. Voltage supply range is 2.3V ~ 3.6V, and the part is active status with ROHS3 compliance.

Q: What packaging options are available?

A: All substitute parts are supplied in 8-SOIC (0.154", 3.90mm Width) surface mount packages. Packaging variants include Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel options, depending on the specific part number selected.

Q: Are extended temperature variants available?

A: Yes. The AT25DF041B-SSHNHR-T and AT25XE041B-SSHNHR-T support operating temperatures from -40°C to 125°C, compared to the standard -40°C to 85°C range. These variants are suitable for industrial and automotive applications requiring extended temperature operation.

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