Equivalent & Substitute Parts for 25LC040AT-I/ST

Part Overview

The 25LC040AT-I/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 non-volatile memory device operates across a 2.5V to 5.5V supply range and supports industrial temperature specifications from -40°C to 85°C. The part is ROHS3 compliant and maintains active product status with verified programmability through DiGi-Electronics. Equivalent and substitute parts are identified to address inventory availability, packaging format requirements, performance specifications, or extended operational parameters.

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	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 25LC040AT-I/ST is determined by the following critical parameters: memory capacity (4Kbit), memory organization (512 x 8), interface protocol (SPI), package form factor (8-TSSOP), and mounting technology (surface mount). Parts are grouped into categories based on operational frequency, voltage supply compatibility, temperature rating, and automotive qualification status.

Direct Substitutes maintain identical or superior electrical specifications within the same package footprint. Frequency-Variant Substitutes operate at different clock speeds but retain full functional compatibility. Extended-Range Substitutes provide enhanced temperature or voltage specifications suitable for demanding applications. Automotive-Grade Substitutes include AEC-Q100 qualification for automotive environments.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temp (°C)	Write Cycle (ms)	Package	Automotive Grade
25LC040AT-I/ST	Microchip	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
25LC040A-I/ST	Microchip	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
25LC040XT-I/ST	Microchip	4Kbit	2	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
AT25040B-XHL-T	Microchip	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
BR25H040FVT-2CE2	Rohm Semiconductor	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	4	8-TSSOP-B	Yes (AEC-Q100)
CAT25040YI-GT3	onsemi	4Kbit	Not Specified	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
M95040-DFDW6TP	STMicroelectronics	4Kbit	20	1.7 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
M95040-DRDW3TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 125	4	8-TSSOP	Yes (AEC-Q100)
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 105	4	8-TSSOP	Yes (AEC-Q100)
M95040-RDW6TP	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	No
M95040-WDW6TP	STMicroelectronics	4Kbit	20	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	No

Engineering Selection Recommendations

For Direct Replacement: The 25LC040A-I/ST provides identical electrical and thermal specifications with equivalent performance. Both parts maintain Microchip Technology manufacturing and ROHS3 compliance. Packaging format differs (Tube versus Tape & Reel), affecting supply chain logistics but not functional compatibility.

For Higher Clock Frequency Applications: The AT25040B-XHL-T, M95040-DFDW6TP, M95040-DRDW3TP/K, M95040-DRDW8TP/K, M95040-RDW6TP, and M95040-WDW6TP operate at 20 MHz, providing 2x frequency capability. These parts maintain 4Kbit capacity and SPI interface compatibility. Voltage supply ranges extend to 1.7V or 1.8V minimum, supporting low-power applications. Write cycle times reduce to 4ms on automotive-qualified variants.

For Lower Frequency Applications: The 25LC040XT-I/ST operates at 2 MHz, suitable for power-constrained or noise-sensitive designs while maintaining full electrical compatibility.

For Extended Temperature Range: The BR25H040FVT-2CE2 and M95040-DRDW3TP/K extend operating temperature to -40°C to 125°C with AEC-Q100 automotive qualification. The M95040-DRDW8TP/K supports -40°C to 105°C with automotive grade certification.

For Automotive Applications: BR25H040FVT-2CE2, M95040-DRDW3TP/K, and M95040-DRDW8TP/K carry AEC-Q100 qualification, meeting automotive reliability and quality standards.

For Verified Programmability: The 25LC040AT-I/ST and M95040-WDW6TP are verified through DiGi-Electronics programmability testing, confirming functional reliability for production environments.

Frequently Asked Questions (FAQ)

Q: Can 25LC040A-I/ST replace 25LC040AT-I/ST in production? A: Yes. Both parts share identical electrical specifications, memory capacity, interface protocol, and package footprint. The difference is packaging format (Tube versus Tape & Reel). Verify your assembly equipment compatibility with the selected packaging format.

Q: What is the functional difference between 10 MHz and 20 MHz variants? A: Clock frequency determines maximum SPI communication speed. The 10 MHz variant (25LC040AT-I/ST) supports data transfer rates up to 10 Mbps. The 20 MHz variants (AT25040B-XHL-T, M95040 series) support up to 20 Mbps. Both maintain identical memory capacity and write cycle times. Select based on system bus speed requirements.

Q: Are automotive-grade parts (BR25H040FVT-2CE2, M95040-DRDW3TP/K, M95040-DRDW8TP/K) compatible with industrial applications? A: Yes. Automotive-grade parts exceed industrial specifications through AEC-Q100 qualification and extended temperature ranges. They function in industrial environments with enhanced reliability margins. Verify your application does not require the specific Microchip part number designation.

Q: What voltage supply range should I select? A: The 25LC040AT-I/ST operates 2.5V to 5.5V. Parts with 1.8V or 1.7V minimum ratings (AT25040B-XHL-T, M95040 series) provide compatibility with lower-voltage systems. Parts with 2.5V minimum (25LC040AT-I/ST, BR25H040FVT-2CE2, M95040-WDW6TP) require higher supply voltages. Confirm your system power supply specifications.

Q: Does package variant 8-TSSOP-B differ functionally from standard 8-TSSOP? A: No. The BR25H040FVT-2CE2 uses 8-TSSOP-B packaging, which maintains identical pinout and electrical characteristics as standard 8-TSSOP. The designation indicates Rohm Semiconductor's variant. Verify PCB footprint compatibility with your design.

Q: Which substitute offers the fastest write cycle time? A: The BR25H040FVT-2CE2 and M95040-DRDW3TP/K and M95040-DRDW8TP/K provide 4ms write cycle time, compared to 5ms on the 25LC040AT-I/ST. This 20% improvement applies to page write operations. Verify your application timing requirements before selecting.

Q: Can I use CAT25040YI-GT3 as a direct substitute? A: Yes, with verification. The CAT25040YI-GT3 maintains 4Kbit capacity, SPI interface, and 8-TSSOP packaging. Clock frequency is not specified in available documentation. Confirm onsemi specifications match your system requirements before implementation.

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