AT25DF041A-SSHF-B Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SSHF-B is a 4Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in 8-SOIC form factor. This device operates at 50 MHz clock frequency with a supply voltage range of 2.3V to 3.6V and supports operating temperatures from -40°C to 85°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	50 MHz
Voltage Supply Range	2.3V – 3.6V
Operating Temperature	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time (Word, Page)	7µs, 5ms
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF041A-SSHF-B is determined by the following critical parameters:

Memory Size: 4Mbit (512K x 8 organization)
Memory Interface: SPI
Package / Case: 8-SOIC form factor
Voltage Supply Range: Minimum 2.3V support required
Operating Temperature: Minimum -40°C to 85°C range required

Substitute parts must maintain compatibility across these core electrical and mechanical specifications. Clock frequency, write cycle time, and product status variations are acceptable provided the above parameters align. Parts with extended temperature ranges (-40°C to 125°C) or higher clock frequencies (85 MHz, 104 MHz) are functionally compatible as they represent performance enhancements or expanded operating conditions.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Product Status
AT25DF041A-SSHF-B	Renesas	4Mbit	50 MHz	2.3V – 3.6V	-40°C to 85°C	8-SOIC	Obsolete
AT25DF041B-SSHN-B	Renesas	4Mbit	104 MHz	1.65V – 3.6V	-40°C to 85°C	8-SOIC	Active
AT25XE041B-SSHN-B	Renesas	4Mbit	85 MHz	1.65V – 3.6V	-40°C to 85°C	8-SOIC	Active
AT25XE041B-SSHN-T	Renesas	4Mbit	85 MHz	1.65V – 3.6V	-40°C to 85°C	8-SOIC	Active
AT25XE041B-SSHNHR-T	Renesas	4Mbit	85 MHz	1.65V – 3.6V	-40°C to 125°C	8-SOIC	Active
LE25U40CMC-AH	onsemi	4Mbit	40 MHz	2.3V – 3.6V	-40°C to 85°C	8-SOIC	Active
W25Q40CLSNIG TR	Winbond	4Mbit	104 MHz	2.3V – 3.6V	-40°C to 85°C	8-SOIC	Active
W25X40CLSNIG	Winbond	4Mbit	104 MHz	2.3V – 3.6V	-40°C to 85°C	8-SOIC	Active
W25X40CLSVIG	Winbond	4Mbit	104 MHz	2.3V – 3.6V	-40°C to 85°C	8-VSOP	Active

Engineering Selection Recommendations

All listed substitute parts maintain the core 4Mbit SPI FLASH memory specification and 8-SOIC package compatibility required for direct replacement of the AT25DF041A-SSHF-B.

Renesas AT25DF041B-SSHN-B and AT25XE041B variants offer active product status with ROHS3 compliance and REACH unaffected certification. These parts are recommended as primary substitutes due to manufacturer continuity and verified programmability status where applicable.

Winbond W25Q40CLSNIG TR and W25X40CLSNIG provide active alternatives with ROHS3 compliance and verified programmability. The W25Q40CLSNIG TR supports quad I/O capability in addition to standard SPI operation, offering enhanced performance flexibility.

onsemi LE25U40CMC-AH is an active substitute with ROHS3 compliance. This part operates at 40 MHz, matching the original device's performance envelope more closely than higher-frequency alternatives.

W25X40CLSVIG uses an 8-VSOP package variant and is not recommended for direct replacement in designs requiring standard 8-SOIC form factor compatibility.

Frequently Asked Questions (FAQ)

Q: Can AT25DF041B-SSHN-B replace AT25DF041A-SSHF-B directly?

A: Yes. Both parts share identical 4Mbit capacity, 512K x 8 organization, SPI interface, and 8-SOIC packaging. The AT25DF041B-SSHN-B operates at 104 MHz versus the original 50 MHz and supports lower minimum supply voltage (1.65V). These represent performance improvements with full backward compatibility.

Q: What is the difference between AT25XE041B-SSHN-T and AT25XE041B-SSHNHR-T?

A: Both parts are electrically identical 4Mbit SPI FLASH devices in 8-SOIC packages operating at 85 MHz. The primary difference is operating temperature range: AT25XE041B-SSHN-T supports -40°C to 85°C, while AT25XE041B-SSHNHR-T extends to -40°C to 125°C. The HR suffix indicates high-temperature rating. Select based on application temperature requirements.

Q: Why is W25X40CLSVIG listed but not recommended?

A: W25X40CLSVIG uses an 8-VSOP package instead of the standard 8-SOIC form factor. While electrically compatible, the different package geometry prevents direct PCB replacement without layout modifications.

Q: Are Winbond parts compatible with Renesas designs?

A: Yes. W25Q40CLSNIG TR and W25X40CLSNIG maintain the same 4Mbit SPI FLASH specification, voltage range (2.3V – 3.6V), temperature range (-40°C to 85°C), and 8-SOIC packaging. Both are ROHS3 compliant and verified programmable, supporting direct substitution.

Q: What does "Quad I/O" mean on the W25Q40CLSNIG TR?

A: Quad I/O capability allows the W25Q40CLSNIG TR to operate in both standard SPI mode and quad I/O mode for higher data throughput. Designs using standard SPI operation are fully compatible; quad mode is an optional enhancement not required for substitution.

Q: Is LE25U40CMC-AH suitable for high-speed applications?

A: LE25U40CMC-AH operates at 40 MHz, lower than the original 50 MHz and significantly lower than 85–104 MHz alternatives. This part is suitable for applications where the original 50 MHz specification is not a critical requirement. For designs requiring maximum performance, Renesas AT25DF041B-SSHN-B or Winbond alternatives are preferred.

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