Equivalent & Substitute Parts for 25LC040A-E/ST

Part Overview

The 25LC040A-E/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 10 MHz with 8-TSSOP surface mount packaging. This device is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent memory capacity, interface protocol, and package form factor are required due to inventory constraints, manufacturing discontinuation, or application-specific performance requirements.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Write Cycle Time	5ms
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Memory Size: 4Kbit (512 x 8 organization)
Memory Interface: SPI protocol
Package / Case: 8-TSSOP form factor with 0.173" width and 4.40mm dimensions
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage Supply Range: Must encompass or overlap with 2.5V ~ 5.5V
Operating Temperature: Must support -40°C minimum and 125°C maximum where applicable
Write Cycle Time: 4ms or 5ms acceptable
Clock Frequency: 5 MHz, 10 MHz, or 20 MHz operation

All identified substitute parts meet the primary compatibility requirements. Variations in clock frequency, voltage supply range, operating temperature upper limit, and write cycle time represent functional enhancements or application-specific variants rather than incompatibilities.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temp (°C)	Write Cycle (ms)	Package	Inventory (Pcs)
25LC040A-E/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	5	8-TSSOP	661
AT25040B-XHL-B	Microchip Technology	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	2800
BR25H040FVT-2CE2	Rohm Semiconductor	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	4	8-TSSOP	3640
CAT25040YI-GT3	onsemi	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	60300
M95040-DFDW6TP	STMicroelectronics	4Kbit	20	1.7 ~ 5.5	-40 ~ 85	5	8-TSSOP	4760
M95040-DRDW3TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 125	4	8-TSSOP	18871
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 105	4	8-TSSOP	4532
M95040-RDW6TP	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	15964
M95040-WDW6TP	STMicroelectronics	4Kbit	20	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	1437
R1EX25004ATA00I#S0	Renesas Electronics Corporation	4Kbit	5	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	3811

Engineering Selection Recommendations

Direct Functional Equivalents (Identical Operating Parameters): BR25H040FVT-2CE2 from Rohm Semiconductor matches the 25LC040A-E/ST across clock frequency (10 MHz), voltage supply range (2.5V ~ 5.5V), and operating temperature range (-40°C ~ 125°C). This part carries AEC-Q100 automotive qualification and is available in higher inventory (3640 pcs). The write cycle time is improved to 4ms.

Enhanced Performance Variants (Higher Clock Frequency): AT25040B-XHL-B, CAT25040YI-GT3, M95040-DFDW6TP, M95040-DRDW3TP/K, M95040-DRDW8TP/K, M95040-RDW6TP, and M95040-WDW6TP operate at 20 MHz, providing doubled clock frequency while maintaining 4Kbit capacity and 8-TSSOP packaging. These parts are suitable for applications requiring higher data throughput. CAT25040YI-GT3 offers the largest inventory (60300 pcs). M95040-DRDW3TP/K and M95040-DRDW8TP/K include AEC-Q100 automotive qualification.

Lower Clock Frequency Variant: R1EX25004ATA00I#S0 from Renesas Electronics operates at 5 MHz, half the frequency of the main part. This variant is suitable for applications with reduced timing requirements or lower power consumption priorities.

Verified Programmable Status: The 25LC040A-E/ST and M95040-WDW6TP are both verified as DiGi-Electronics Programmable. All substitute parts maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC040A-E/ST with a 20 MHz variant? A: Yes. All 20 MHz variants (AT25040B-XHL-B, CAT25040YI-GT3, M95040 series) maintain 4Kbit capacity, SPI interface, and 8-TSSOP packaging. Higher clock frequency is backward compatible with applications designed for 10 MHz operation. Verify your system can tolerate the reduced operating temperature upper limit (85°C) for most 20 MHz options, except M95040-DRDW3TP/K and M95040-DRDW8TP/K which support 125°C and 105°C respectively.

Q: What is the difference between the various M95040 part numbers? A: M95040 variants differ in packaging format (Tape & Reel, Cut Tape & Digi-Reel, or Tube), operating temperature range, and automotive qualification status. M95040-DRDW3TP/K and M95040-DRDW8TP/K include AEC-Q100 qualification. All maintain identical memory specifications and 8-TSSOP package dimensions.

Q: Is the 8-TSSOP-B package compatible with 8-TSSOP footprints? A: BR25H040FVT-2CE2 uses 8-TSSOP-B packaging. The physical dimensions (0.173" width, 4.40mm) are identical to standard 8-TSSOP, ensuring PCB footprint compatibility.

Q: Can I use R1EX25004ATA00I#S0 as a direct replacement? A: R1EX25004ATA00I#S0 operates at 5 MHz, half the frequency of the main part. It is functionally compatible but suitable only for applications where lower clock frequency is acceptable. Verify timing requirements before substitution.

Q: Which substitute offers the best inventory availability? A: CAT25040YI-GT3 from onsemi provides the highest inventory at 60300 pcs, followed by M95040-DRDW3TP/K at 18871 pcs and M95040-RDW6TP at 15964 pcs.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the 25LC040A-E/ST.

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