25LC040A-I/MS EEPROM Equivalent & Substitute Parts

Part Overview

The 25LC040A-I/MS is a 4Kbit Serial Peripheral Interface (SPI) EEPROM manufactured by Microchip Technology, packaged in 8-MSOP surface mount configuration. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and is rated for industrial temperature range (-40°C to 85°C). The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, organization, package compatibility, and electrical specifications.

Key Parameters

Parameter	25LC040A-I/MS
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Memory Size: 4Kbit (mandatory)
Memory Organization: 512 x 8 (mandatory)
Memory Interface: SPI (mandatory)
Memory Type: Non-Volatile EEPROM (mandatory)
Write Cycle Time: 5ms (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)

Secondary Compatibility Parameters:

Package Type: 8-MSOP or 8-TSSOP (both are 8-pin surface mount packages with compatible pinouts)
Voltage Supply Range: Must encompass or be compatible with 2.5V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
Clock Frequency: 10 MHz or higher (backward compatible)

Substitute parts are grouped into two categories:

Category A - Direct Pin-Compatible Substitutes (8-MSOP Package):

25AA040A-I/MS (Microchip Technology): Identical package, extended voltage range (1.8V ~ 5.5V), same clock frequency

Category B - Package-Compatible Substitutes (8-TSSOP Package):

AT25040B-XHL-B, AT25040B-XHL-T (Microchip Technology)
CAT25040YI-GT3 (onsemi)
CAV25040YE-GT3 (onsemi)
M95040-DFDW6TP, M95040-DRDW8TP/K, M95040-RDW6TP, M95040-WDW6TP (STMicroelectronics)

All substitute parts maintain 4Kbit capacity, 512 x 8 organization, SPI interface, and RoHS3 compliance. Package transition from 8-MSOP to 8-TSSOP requires PCB layout modification but maintains electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package	Write Cycle Time	RoHS Status
25LC040A-I/MS	Microchip	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	ROHS3
25AA040A-I/MS	Microchip	4Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	ROHS3
AT25040B-XHL-B	Microchip	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3
AT25040B-XHL-T	Microchip	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3
CAT25040YI-GT3	onsemi	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3
CAV25040YE-GT3	onsemi	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	5ms	ROHS3
M95040-DFDW6TP	STMicroelectronics	4Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	4ms	ROHS3
M95040-RDW6TP	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3
M95040-WDW6TP	STMicroelectronics	4Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	ROHS3

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (No PCB Modification): Select 25AA040A-I/MS when maintaining the 8-MSOP package is required. This part offers extended voltage range (1.8V minimum) while preserving identical pinout and package footprint. Both parts are Active status and RoHS3 compliant.

For Package Migration to 8-TSSOP: When transitioning to 8-TSSOP package, select based on application requirements:

Standard Industrial Applications: AT25040B-XHL-T, CAT25040YI-GT3, or M95040-RDW6TP provide 20 MHz operation with standard temperature range (-40°C to 85°C) and RoHS3 compliance.
Extended Temperature Range: CAV25040YE-GT3 supports -40°C to 125°C operating range, suitable for automotive and harsh environment applications. This part includes AEC-Q100 qualification.
Automotive Grade: M95040-DRDW8TP/K is AEC-Q100 qualified with extended temperature range (-40°C to 105°C) and reduced write cycle time (4ms). Suitable for automotive and mission-critical applications.
Low Voltage Applications: M95040-DFDW6TP supports minimum 1.7V supply voltage, enabling operation in low-power systems.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 25AA040A-I/MS directly replace 25LC040A-I/MS without PCB changes?

A: Yes. Both parts use identical 8-MSOP package with compatible pinouts. The 25AA040A-I/MS offers extended voltage range (1.8V minimum vs. 2.5V minimum) and identical clock frequency (10 MHz), making it a direct pin-compatible substitute.

Q: What is the difference between 8-MSOP and 8-TSSOP packages?

A: Both are 8-pin surface mount packages with identical pinout and electrical compatibility. The primary difference is physical dimensions: 8-MSOP has 3.00mm width while 8-TSSOP has 4.40mm width. Substitution requires PCB layout modification to accommodate the different footprint.

Q: Why do some substitute parts operate at 20 MHz instead of 10 MHz?

A: Higher clock frequency (20 MHz) is backward compatible with 10 MHz applications. The 25LC040A-I/MS operates at 10 MHz; substitute parts rated for 20 MHz can operate at reduced clock speeds without performance degradation.

Q: Which substitute part should I select for automotive applications?

A: M95040-DRDW8TP/K or CAV25040YE-GT3 are qualified for automotive use. M95040-DRDW8TP/K includes AEC-Q100 qualification and supports extended temperature range (-40°C to 105°C). CAV25040YE-GT3 also includes AEC-Q100 qualification with -40°C to 125°C range.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original 25LC040A-I/MS regulatory requirements.

Q: What is the impact of voltage supply range differences?

A: The original part operates at 2.5V ~ 5.5V. Substitute parts with lower minimum voltage (1.8V or 1.7V) offer extended low-voltage capability. Substitute parts with identical or higher minimum voltage are directly compatible. Verify system supply voltage against selected part specifications.

Q: Can I use M95040-DRDW8TP/K in a non-automotive application?

A: Yes. Automotive-qualified parts exceed standard industrial specifications and are suitable for general industrial applications. The AEC-Q100 qualification indicates enhanced reliability and extended temperature range, providing performance margin for demanding environments.

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