AT25DF041A-SSH-B Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SSH-B is a 4Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in 8-SOIC form factor. This device operates at 70 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The part is currently 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	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 (Page)	5ms
Product Status	Obsolete

Substitute Part Grouping Explanation

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

Core Compatibility Requirements:

Memory Size: 4Mbit (512K x 8 organization)
Memory Interface: SPI
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Voltage Supply Range: Must encompass or be compatible with 2.7V ~ 3.6V
Operating Temperature: Must support -40°C ~ 85°C minimum

Performance Considerations:

Clock Frequency: 70 MHz or higher
Write Cycle Time: Equal to or faster than 5ms page write

Substitute parts are grouped into two categories based on these parameters:

Category 1: Renesas Electronics (Direct Manufacturer Alternatives)

AT25DF041B-SSHN-B: Active product, 104 MHz, enhanced voltage range (1.65V ~ 3.6V), faster page write (2.5ms)
AT25XE041B-SSHN-B and AT25XE041B-SSHN-T: Active products, 85 MHz, extended voltage range (1.65V ~ 3.6V), page write 2.75ms
AT25XE041B-SSHNHR-T: Active product, 85 MHz, extended temperature range (-40°C ~ 125°C), extended voltage range

Category 2: Alternative Manufacturers (Cross-Vendor Substitutes)

LE25U40CMC-AH (onsemi): 40 MHz, 2.3V ~ 3.6V, 8-SOP-J package variant
SST25VF040B-50-4I-SAE and SST25VF040B-50-4I-SAF (Microchip): 50 MHz, 2.7V ~ 3.6V
W25Q40CLSNIG TR (Winbond): 104 MHz, SPI-Quad I/O capable, 2.3V ~ 3.6V
W25X40CLSNIG (Winbond): 104 MHz, 2.3V ~ 3.6V
W25X40CLSVIG (Winbond): 104 MHz, 8-VSOP package variant

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package	Page Write Time	Product Status
AT25DF041A-SSH-B	Renesas	4Mbit	70 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	5ms	Obsolete
AT25DF041B-SSHN-B	Renesas	4Mbit	104 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	2.5ms	Active
AT25XE041B-SSHN-B	Renesas	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	2.75ms	Active
AT25XE041B-SSHN-T	Renesas	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 85°C	8-SOIC	2.75ms	Active
AT25XE041B-SSHNHR-T	Renesas	4Mbit	85 MHz	1.65V ~ 3.6V	-40°C ~ 125°C	8-SOIC	2.75ms	Active
LE25U40CMC-AH	onsemi	4Mbit	40 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	8-SOP-J	5ms	Active
SST25VF040B-50-4I-SAE	Microchip	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	10µs	Active
SST25VF040B-50-4I-SAF	Microchip	4Mbit	50 MHz	2.7V ~ 3.6V	-40°C ~ 85°C	8-SOIC	10µs	Active
W25Q40CLSNIG TR	Winbond	4Mbit	104 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	800µs	Active
W25X40CLSNIG	Winbond	4Mbit	104 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	800µs	Active
W25X40CLSVIG	Winbond	4Mbit	104 MHz	2.3V ~ 3.6V	-40°C ~ 85°C	8-VSOP	800µs	Active

Engineering Selection Recommendations

Primary Recommendation: AT25DF041B-SSHN-B

This Renesas part maintains manufacturer continuity and is the direct successor to the obsolete AT25DF041A-SSH-B. It offers improved performance (104 MHz vs. 70 MHz), faster page write cycles (2.5ms vs. 5ms), and an extended voltage supply range (1.65V ~ 3.6V). The part is ROHS3 compliant and REACH unaffected. Product status is active with verified DiGi-Electronics programmability.

Secondary Recommendation: AT25XE041B-SSHN-T or AT25XE041B-SSHNHR-T

These Renesas alternatives provide 85 MHz operation with extended voltage range (1.65V ~ 3.6V). The AT25XE041B-SSHNHR-T variant extends the operating temperature range to -40°C ~ 125°C, suitable for high-temperature applications. Both are ROHS3 compliant and active products.

Cross-Vendor Alternatives:

Winbond W25X40CLSNIG and W25Q40CLSNIG TR offer 104 MHz performance with verified programmability (W25Q40CLSNIG TR). Both support the full -40°C ~ 85°C temperature range and are ROHS3 compliant. The W25Q40CLSNIG TR provides additional SPI-Quad I/O capability.

Microchip SST25VF040B series (50 MHz) and onsemi LE25U40CMC-AH (40 MHz) are suitable for applications where lower clock frequencies are acceptable. All cross-vendor options are ROHS3 compliant and active products.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical memory organization (512K x 8), SPI interface, 8-SOIC package, and -40°C ~ 85°C operating temperature range. The AT25DF041B-SSHN-B is the active successor with improved specifications (higher clock frequency, faster write cycles, lower minimum voltage).

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

A: Both parts are electrically identical with 85 MHz clock frequency and identical electrical parameters. The difference is packaging: SSHN-B is supplied in Tube, while SSHN-T is supplied in Tape & Reel (TR). Select based on your procurement and assembly requirements.

Q: Why does LE25U40CMC-AH operate at only 40 MHz when the original part is 70 MHz?

A: The LE25U40CMC-AH is a lower-performance alternative suitable for applications where 40 MHz operation is sufficient. It maintains the same 4Mbit capacity and SPI interface but operates at reduced clock frequency. Verify your application's timing requirements before selection.

Q: Can I use W25X40CLSVIG as a substitute if my board layout uses 8-SOIC footprint?

A: No. W25X40CLSVIG uses an 8-VSOP package, which has a different footprint than the 8-SOIC required for AT25DF041A-SSH-B. Use W25X40CLSNIG (8-SOIC package) instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the extended temperature range in AT25XE041B-SSHNHR-T?

A: The AT25XE041B-SSHNHR-T supports -40°C ~ 125°C operating temperature, compared to -40°C ~ 85°C for most alternatives. Select this variant only if your application requires operation above 85°C.

Q: Which substitute offers the fastest write performance?

A: Winbond W25Q40CLSNIG TR and W25X40CLSNIG offer the fastest page write time at 800µs. Renesas AT25DF041B-SSHN-B provides 2.5ms page write time. Microchip SST25VF040B series specifies 10µs word write time. Verify your application's write cycle requirements.

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