AT25DF041A-SH-B FLASH Memory IC Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SH-B 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 70 MHz with a supply voltage range of 2.7V to 3.6V and is rated for industrial temperature range (-40°C to 85°C). The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support, production continuity, and system maintenance applications.

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 Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Write Cycle Time (Page)	5ms

Substitute Part Grouping Explanation

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

Primary Compatibility Criteria:

Memory capacity: 4Mbit (512K x 8 organization)
Memory interface: SPI protocol
Package: 8-SOIC form factor with 5.30mm width
Supply voltage: 2.7V ~ 3.6V range
Operating temperature: -40°C ~ 85°C range
Mounting: Surface mount technology

Secondary Performance Considerations:

Clock frequency: 70 MHz (minimum acceptable performance level)
Write cycle time specifications

All four substitute parts meet the primary compatibility criteria. Variations in clock frequency and write cycle time represent performance enhancements or trade-offs but do not prevent functional substitution within the specified electrical and mechanical constraints.

Parameter Comparison

Parameter	AT25DF041A-SH-B	SST25VF040B-50-4I-S2AE	SST25VF040B-50-4I-S2AF	W25Q40CLSSIG	W25X40CLSSIG
Manufacturer	Renesas Electronics	Microchip Technology	Microchip Technology	Winbond Electronics	Winbond Electronics
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI	SPI	SPI - Quad I/O	SPI
Clock Frequency	70 MHz	50 MHz	50 MHz	104 MHz	104 MHz
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 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)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Write Cycle Time (Page)	5ms	10µs	10µs	800µs	800µs
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SST25VF040B-50-4I-S2AE and SST25VF040B-50-4I-S2AF (Microchip Technology)

Both SST25VF040B variants are active products with ROHS3 compliance. These parts operate at 50 MHz, which is below the original 70 MHz specification. The SST25VF040B-50-4I-S2AF offers significantly higher inventory availability (36,600 units) compared to the S2AE variant (1,406 units). Both maintain identical electrical and mechanical compatibility with the AT25DF041A-SH-B within the specified parameter ranges.

W25Q40CLSSIG (Winbond Electronics)

The W25Q40CLSSIG is an active product with ROHS3 compliance and extended SPI-Quad I/O capability. It operates at 104 MHz, exceeding the original specification, and supports a lower minimum supply voltage (2.3V). The Quad I/O interface provides enhanced performance potential but requires protocol compatibility verification in the target application. Inventory availability is 901 units.

W25X40CLSSIG (Winbond Electronics)

The W25X40CLSSIG is an active product with ROHS3 compliance and verified DiGi-Electronics programmability. Operating at 104 MHz with standard SPI interface, this part provides direct functional compatibility with the AT25DF041A-SH-B. The extended supply voltage range (2.3V ~ 3.6V) and highest inventory availability (44,400 units) support production continuity and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can the SST25VF040B series operate at the original 70 MHz clock frequency?

A: The SST25VF040B-50-4I-S2AE and SST25VF040B-50-4I-S2AF are rated for 50 MHz maximum clock frequency. Operation at 70 MHz exceeds the manufacturer specification for these devices.

Q: What is the difference between W25Q40CLSSIG and W25X40CLSSIG?

A: The W25Q40CLSSIG supports SPI-Quad I/O interface with 104 MHz operation. The W25X40CLSSIG provides standard SPI interface with 104 MHz operation. Both share identical 4Mbit capacity, 8-SOIC packaging, and voltage/temperature specifications. The W25X40CLSSIG has verified programmability status and higher inventory availability.

Q: Are all substitute parts pin-compatible with the AT25DF041A-SH-B?

A: All substitute parts use the 8-SOIC package with 5.30mm width. Pin compatibility requires verification of signal assignments and protocol implementation in the target application circuit.

Q: What is the impact of the lower write cycle time in substitute parts?

A: The SST25VF040B variants specify 10µs page write time compared to 5ms for the AT25DF041A-SH-B, representing improved write performance. The Winbond parts specify 800µs page write time. Faster write cycles do not create compatibility issues in applications designed for the original specification.

Q: Which substitute part offers the best long-term availability?

A: The W25X40CLSSIG offers the highest current inventory (44,400 units) and active product status with ROHS3 compliance, supporting sustained production and design continuity.

Q: Can the W25Q40CLSSIG Quad I/O mode be used as a direct replacement?

A: The W25Q40CLSSIG supports both standard SPI and Quad I/O modes. Operation in standard SPI mode provides direct functional compatibility. Quad I/O mode requires application-level protocol support and should be evaluated separately.

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