25LC040AT-M/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC040AT-M/SN is a 4Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIC 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 supports industrial temperature range operation from -55°C to 125°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level rating.

Substitute parts are necessary when the original 25LC040AT-M/SN becomes unavailable due to inventory constraints, end-of-life status, or when alternative packaging formats or performance specifications better suit application requirements.

Key Parameters

Parameter	Value
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	-55°C ~ 125°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 25LC040AT-M/SN is determined by the following critical parameters:

Primary Substitution Criteria:

Memory Size: 4Kbit (mandatory match)
Memory Organization: 512 x 8 (mandatory match)
Memory Interface: SPI (mandatory match)
Package Type: 8-SOIC or compatible footprint (mandatory match)
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Write Cycle Time: 5ms or faster (backward compatible)

Secondary Considerations:

Clock Frequency: 10 MHz or higher (backward compatible)
Operating Temperature Range: Must support minimum -55°C to 125°C or application-specific subset
Product Status: Active or recently active parts preferred
Compliance: ROHS3 and REACH compliance maintained

Substitute parts are grouped into three categories based on electrical compatibility and packaging format:

Group 1 - Microchip Technology Direct Equivalents (8-SOIC, 10 MHz): 25LC040AT-E/SN and CAV25040VE-GT3 maintain identical electrical specifications with the main part.

Group 2 - Enhanced Performance Alternatives (8-SOIC, 20 MHz): AT25040B-SSHL-B, AT25040B-SSHL-T, M95040-DFMN6TP, M95040-DRMN8TP/K, and M95040-RMN6TP offer doubled clock frequency with compatible voltage and package specifications.

Group 3 - Alternative Package Formats (8-TDFN, 20 MHz): CAT25040VP2I-GT3 provides equivalent electrical performance in a smaller 8-TDFN package footprint.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package	Product Status	RoHS
25LC040AT-M/SN	Microchip	4Kbit	10 MHz	2.5V ~ 5.5V	-55°C ~ 125°C	8-SOIC	Active	ROHS3
25LC040AT-E/SN	Microchip	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3
AT25040B-SSHL-B	Microchip	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
AT25040B-SSHL-T	Microchip	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
CAT25040VI-GT3	onsemi	4Kbit	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
CAT25040VP2I-GT3	onsemi	4Kbit	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TDFN	Active	ROHS3
CAV25040VE-GT3	onsemi	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3
M95040-DFMN6TP	STMicroelectronics	4Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
M95040-DRMN8TP/K	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 105°C	8-SOIC	Active	ROHS3
M95040-RMN6TP	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): 25LC040AT-E/SN is the primary direct substitute, offering identical electrical performance with Tape & Reel packaging. Both parts maintain 10 MHz clock frequency, 2.5V to 5.5V supply range, and 8-SOIC package format. The operating temperature range differs only at the lower bound (-40°C versus -55°C), which is acceptable for most industrial applications. This part is verified as DiGi-Electronics programmable and carries higher inventory availability (11,405 units).

Automotive-Grade Alternative: CAV25040VE-GT3 provides equivalent electrical specifications with automotive qualification (AEC-Q100) and is suitable for applications requiring automotive-grade components. This part maintains the 10 MHz frequency and 2.5V to 5.5V supply range with extended temperature support to 125°C.

Enhanced Performance Substitutes (20 MHz): AT25040B-SSHL-T, M95040-DFMN6TP, M95040-DRMN8TP/K, and M95040-RMN6TP offer doubled clock frequency (20 MHz) while maintaining 4Kbit capacity and 8-SOIC packaging. These parts are suitable when higher SPI clock speeds are required. M95040-DRMN8TP/K includes automotive qualification and supports -40°C to 105°C temperature range. All enhanced performance parts reduce the operating temperature upper limit to 85°C or 105°C, which must be evaluated against application requirements.

Alternative Package Format: CAT25040VP2I-GT3 provides 4Kbit SPI EEPROM in 8-TDFN package (2x3mm), suitable for space-constrained applications. This part is compatible with the main part's electrical specifications but requires PCB layout redesign due to different footprint geometry.

Product Status Consideration: All recommended substitutes maintain Active product status with ROHS3 compliance. CAT25040VI-G is marked Obsolete and should be avoided for new designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can 25LC040AT-E/SN directly replace 25LC040AT-M/SN without circuit modification?

A: Yes. Both parts share identical memory capacity (4Kbit), interface (SPI), clock frequency (10 MHz), supply voltage range (2.5V to 5.5V), and 8-SOIC package. The operating temperature range differs only at the lower specification (-40°C minimum versus -55°C), which does not affect compatibility in most applications. No circuit modifications are required.

Q: What is the difference between 8-SOIC and 8-TDFN packages?

A: 8-SOIC (Small Outline Integrated Circuit) measures 0.154" width with 1.27mm lead pitch, while 8-TDFN (Thin Dual Flat No-Lead) measures 2x3mm with 0.5mm lead pitch. TDFN packages occupy approximately 40% less board area but require different PCB footprint design and reflow soldering profiles. CAT25040VP2I-GT3 uses 8-TDFN format and is not pin-compatible with 8-SOIC parts.

Q: Are 20 MHz parts backward compatible with 10 MHz designs?

A: Yes. Parts with 20 MHz clock frequency are backward compatible with 10 MHz designs. The SPI interface operates at the clock frequency specified by the host controller, so a 20 MHz-capable part functions correctly when driven at 10 MHz. No design changes are required, and the higher frequency capability provides future flexibility.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is the Automotive Electronics Council qualification standard for integrated circuits used in automotive applications. Parts meeting this standard (M95040-DRMN8TP/K and CAV25040VE-GT3) undergo additional reliability testing and are suitable for automotive-grade designs. Non-automotive parts do not carry this qualification.

Q: Can I use parts with lower voltage supply minimums?

A: Parts with lower voltage minimums (1.7V or 1.8V) are compatible with 2.5V to 5.5V designs. The lower minimum specification provides additional flexibility for low-power applications but does not affect operation in the 2.5V to 5.5V range. Verify that your application does not require operation below the substitute part's minimum voltage specification.

Q: What is the significance of MSL (Moisture Sensitivity Level)?

A: MSL 1 (Unlimited) indicates the part can be stored indefinitely without moisture baking requirements before soldering. MSL 3 (168 Hours) requires moisture baking if the part has been exposed to ambient humidity for more than 168 hours. AT25040B-SSHL-B carries MSL 3 and requires moisture control procedures; all other substitutes carry MSL 1 with no moisture handling restrictions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message