AT25DF041A-SHF-T Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SHF-T is a 4Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 50 MHz with a supply voltage range of 2.3V to 3.6V and supports operating temperatures from -40°C to 85°C. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

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 Range	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Write Cycle Time (Page)	5ms

Substitute Part Grouping Explanation

Substitute parts for the AT25DF041A-SHF-T are qualified based on the following critical parameters:

Memory Capacity: 4Mbit (512K x 8 organization)
Package Compatibility: 8-SOIC form factor with identical 0.209" width and 5.30mm dimensions
Voltage Compatibility: 2.3V to 3.6V supply voltage range
Temperature Range: -40°C to 85°C operating specification
Interface Type: SPI protocol support (standard or enhanced modes acceptable)
Surface Mount Technology: Compatible with existing PCB assembly processes

The substitute parts identified maintain electrical and mechanical compatibility within these parameters. Enhanced specifications (higher clock frequency, additional interface modes) do not preclude substitution when core parameters align.

Parameter Comparison

Parameter	AT25DF041A-SHF-T	W25Q40CLSSIG TR	W25X40CLSSIG TR
Manufacturer	Renesas Electronics	Winbond Electronics	Winbond Electronics
Memory Size	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI - Quad I/O	SPI
Clock Frequency	50 MHz	104 MHz	104 MHz
Voltage Supply Range	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Write Cycle Time (Page)	5ms	800µs	800µs
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both W25Q40CLSSIG TR and W25X40CLSSIG TR meet the core electrical and mechanical substitution criteria for the AT25DF041A-SHF-T. Selection between these alternatives should be based on the following factors:

W25X40CLSSIG TR is the primary substitute. This device maintains standard SPI interface compatibility with the original part, operates at an enhanced clock frequency of 104 MHz, and carries active product status with ROHS3 compliance certification. Programmability has been verified for this part number.

W25Q40CLSSIG TR provides an alternative with extended interface capability (SPI - Quad I/O mode), enabling higher data throughput when the application supports quad I/O operation. This part also maintains active product status and ROHS3 compliance. Programmability verification status is not confirmed for this variant.

Both substitutes feature improved write cycle performance (800µs page write versus 5ms) and identical supply voltage and temperature specifications. The choice between them depends on whether the application requires standard SPI operation or can utilize quad I/O functionality.

Frequently Asked Questions (FAQ)

Q: Can W25X40CLSSIG TR be used as a direct replacement for AT25DF041A-SHF-T?

A: Yes. The W25X40CLSSIG TR maintains compatibility across all critical parameters: 4Mbit capacity, 512K x 8 organization, SPI interface, 2.3V to 3.6V supply voltage, -40°C to 85°C operating temperature, and identical 8-SOIC package dimensions. The higher clock frequency (104 MHz versus 50 MHz) and faster write cycle time represent performance improvements that do not compromise backward compatibility.

Q: What is the difference between W25Q40CLSSIG TR and W25X40CLSSIG TR?

A: Both devices are 4Mbit FLASH memory ICs from Winbond with identical core specifications. The primary difference is the memory interface: W25Q40CLSSIG TR supports SPI - Quad I/O mode, enabling four-bit parallel data transfer, while W25X40CLSSIG TR operates in standard SPI mode. Both operate at 104 MHz and feature 800µs page write cycles. Selection depends on whether the application circuit supports quad I/O signaling.

Q: Are there any package compatibility concerns?

A: No. All three parts use the 8-SOIC package with identical dimensions (0.209" width, 5.30mm). Pin assignments and footprints are compatible for surface mount assembly on existing PCBs designed for the AT25DF041A-SHF-T.

Q: What compliance certifications apply to the substitute parts?

A: Both Winbond alternatives (W25Q40CLSSIG TR and W25X40CLSSIG TR) are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8542.32.0071, matching the original part's regulatory status.

Q: How do the write cycle times compare?

A: The AT25DF041A-SHF-T specifies a 5ms page write cycle time. Both Winbond substitutes reduce this to 800µs, providing approximately 6x faster write performance. This improvement is transparent to applications using standard SPI write commands and does not require firmware modifications.

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