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

Part Overview

The 25LC040AT-E/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-DFN (2x3) surface mount package. The device is currently in active production status and is ROHS3 compliant. Equivalent and substitute parts are identified when they maintain functional compatibility across memory capacity, interface protocol, organization, and critical electrical parameters while accommodating variations in package form factors and operating specifications.

Substiute Parts

25LC040AT-E/MC

Microchip TechnologyIn Stock: 93425LC040AT-E/MC Datasheet

Current PartRFQ

CAT25040HU4I-GT3

onsemiIn Stock: 3954CAT25040HU4I-GT3 Datasheet

MFR RecommendedRFQ

CAT25040VP2I-GT3

onsemiIn Stock: 8501CAT25040VP2I-GT3 Datasheet

MFR RecommendedRFQ

M95040-DFMC6TG

STMicroelectronicsIn Stock: 5984M95040-DFMC6TG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 25LC040AT-E/MC are qualified based on the following core parameters that determine functional interchangeability:

Critical Matching Parameters:

• Memory capacity: 4Kbit
• Memory organization: 512 x 8
• Interface protocol: SPI
• Write cycle time: 5ms
• Supply voltage compatibility: Minimum 2.5V support or lower
• Operating temperature range: Minimum -40°C to maximum 85°C or higher
• Mounting type: Surface mount
• Package class: 8-pin DFN/UFDFN/TDFN variants with exposed pad

Allowable Variations:

• Clock frequency: May exceed 10 MHz (backward compatible)
• Supply voltage upper limit: May exceed 5.5V
• Package footprint: Different DFN variants (VFDFN, UFDFN, TDFN) with equivalent pin counts and exposed pad configuration
• Manufacturer: Different qualified manufacturers

The three substitute parts listed below meet these criteria while offering variations in clock frequency capability and supply voltage range.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements. The following considerations apply to part selection:

CAT25040HU4I-GT3 (onsemi): This part extends the lower supply voltage limit to 1.8V, providing enhanced compatibility with low-power applications. Operating temperature range is limited to -40°C to 85°C, which is acceptable for most industrial and commercial applications but does not support the extended high-temperature capability of the original part.

CAT25040VP2I-GT3 (onsemi): Similar to the CAT25040HU4I-GT3, this variant offers 1.8V minimum supply voltage support. The package form factor differs (8-WFDFN versus 8-VFDFN), requiring PCB layout verification for footprint compatibility. Operating temperature range matches the CAT25040HU4I-GT3 specification.

M95040-DFMC6TG (STMicroelectronics): This part provides the highest clock frequency capability at 20 MHz, exceeding the original 10 MHz specification. The lower supply voltage limit of 1.7V offers broad voltage compatibility. Operating temperature range is -40°C to 85°C. This part is suitable for applications requiring higher data throughput while maintaining backward compatibility with 10 MHz operation.

All substitute parts are currently in active production status with verified inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CAT25040HU4I-GT3 or CAT25040VP2I-GT3 be used as direct replacements for 25LC040AT-E/MC in high-temperature applications?

A: No. The onsemi parts are rated to 85°C maximum operating temperature, while the original Microchip part supports 125°C. Applications requiring operation above 85°C must use the original 25LC040AT-E/MC or verify that the reduced temperature range is acceptable for the specific application.

Q: What is the significance of the different package designations (VFDFN, UFDFN, WFDFN)?

A: These designations indicate variations in the DFN package form factor. All are 8-pin packages with exposed pads in 2x3mm footprints, but physical dimensions and pad layouts may differ slightly. PCB layout and assembly equipment compatibility must be verified before substitution.

Q: Does the M95040-DFMC6TG operate at 20 MHz in all applications?

A: The M95040-DFMC6TG is rated for 20 MHz maximum clock frequency. However, it is backward compatible with lower clock frequencies, including the 10 MHz specification of the original part. System design determines the actual operating frequency.

Q: Are all substitute parts compatible with the same supply voltage range as the original 25LC040AT-E/MC?

A: The original part requires minimum 2.5V supply voltage. All substitute parts support lower minimum voltages (1.7V to 1.8V), making them compatible with 2.5V to 5.5V applications. However, applications operating below 1.8V require the original Microchip part or verification of substitute part suitability.

Q: What is the impact of MSL Level 1 rating on component handling?

A: MSL Level 1 indicates unlimited shelf life and no moisture sensitivity precautions are required. All parts listed, including the original and substitutes, can be stored and handled without special moisture control measures.