25LC040AT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC040AT-I/MC is a 4Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology. This non-volatile memory device operates at 10 MHz with a supply voltage range of 2.5V to 5.5V and is housed in an 8-pin DFN package (2x3mm). The component is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package compatibility, and electrical operating parameters.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Write Cycle Time	5ms
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad (2x3mm)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC040AT-I/MC are qualified based on the following critical parameters:

Memory Capacity: 4Kbit (512 x 8 organization) — all substitutes maintain identical capacity
Interface Protocol: SPI — all substitutes use SPI communication
Write Cycle Time: 5ms — all substitutes meet or exceed this specification
Operating Temperature Range: -40°C ~ 85°C — all substitutes support this range
Supply Voltage Compatibility: Substitutes operate within overlapping voltage ranges (minimum 1.7V to 2.5V, maximum 5.5V)
Package Form Factor: 8-pin DFN variants with exposed pad — all substitutes use compatible 8-pin DFN packages
Product Status: All substitutes are in active production
Compliance: All substitutes maintain ROHS3 compliance and EAR99 classification

The three qualified substitute parts are manufactured by onsemi (CAT25040HU4I-GT3, CAT25040VP2I-GT3) and STMicroelectronics (M95040-DFMC6TG), each offering equivalent or enhanced performance characteristics within the same functional category.

Parameter Comparison

Parameter	25LC040AT-I/MC (Microchip)	CAT25040HU4I-GT3 (onsemi)	CAT25040VP2I-GT3 (onsemi)	M95040-DFMC6TG (STMicroelectronics)
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit
Memory Organization	512 x 8	512 x 8	512 x 8	512 x 8
Memory Interface	SPI	SPI	SPI	SPI
Clock Frequency	10 MHz	Not specified	Not specified	20 MHz
Write Cycle Time	5ms	5ms	5ms	5ms
Supply Voltage Range	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad	8-UFDFN Exposed Pad	8-WFDFN Exposed Pad	8-UFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts maintain active product status and full ROHS3 compliance, meeting the regulatory and supply chain requirements equivalent to the 25LC040AT-I/MC.

CAT25040HU4I-GT3 (onsemi): This substitute operates across an extended lower voltage range (1.8V minimum) compared to the primary part (2.5V minimum), providing broader compatibility with low-power applications. The 8-UFDFN package is mechanically compatible with the original 8-VFDFN footprint.

CAT25040VP2I-GT3 (onsemi): This variant also supports 1.8V minimum supply voltage and uses an 8-WFDFN package configuration. Both onsemi substitutes are cross-referenced in the original part's substitute list, indicating manufacturer-level compatibility validation.

M95040-DFMC6TG (STMicroelectronics): This substitute offers enhanced clock frequency performance at 20 MHz (double the original 10 MHz specification) while maintaining all other electrical and thermal parameters. The 1.7V minimum supply voltage extends low-voltage operation capability. This part is also listed in the original substitute cross-reference.

All substitutes maintain identical memory capacity, SPI interface protocol, write cycle timing, and operating temperature range. Package form factors are all 8-pin DFN variants with exposed pads, suitable for surface mount assembly on compatible PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can CAT25040HU4I-GT3 or CAT25040VP2I-GT3 be used as direct replacements for 25LC040AT-I/MC?

A: Yes. Both onsemi parts maintain identical 4Kbit capacity, SPI interface, 5ms write cycle time, and -40°C to 85°C operating temperature range. The extended lower voltage range (1.8V vs. 2.5V minimum) provides additional design flexibility. Package compatibility requires verification of PCB footprint dimensions for the specific DFN variant.

Q: What is the primary advantage of M95040-DFMC6TG over the original 25LC040AT-I/MC?

A: The M95040-DFMC6TG operates at 20 MHz clock frequency, providing twice the data transfer rate of the original 10 MHz specification. All other functional parameters remain equivalent, including memory capacity, interface protocol, and thermal characteristics.

Q: Are there voltage compatibility concerns when substituting these parts?

A: The 25LC040AT-I/MC operates from 2.5V to 5.5V. All three substitutes support 5.5V maximum. The onsemi parts (CAT25040HU4I-GT3, CAT25040VP2I-GT3) and STMicroelectronics part (M95040-DFMC6TG) all support lower minimum voltages (1.8V and 1.7V respectively), making them compatible in any circuit designed for the original 2.5V to 5.5V range.

Q: Do package differences affect PCB layout compatibility?

A: All substitutes use 8-pin DFN packages with exposed pads in 2x3mm form factor. Specific package variants (VFDFN, UFDFN, WFDFN) have minor dimensional differences. PCB footprint verification is required to ensure mechanical and electrical compatibility with the original design.

Q: Are all substitutes RoHS compliant?

A: Yes. All three substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory certifications.

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