Equivalent & Substitute Parts for 25LC040XT-I/ST

Part Overview

The 25LC040XT-I/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 2 MHz with 8-TSSOP surface mount packaging. This device is classified as Active product status and is RoHS3 compliant. Substitute parts are necessary when the original part becomes unavailable, when higher clock frequency operation is required, or when alternative manufacturer sourcing is needed for supply chain optimization.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	2 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 is determined by the following critical parameters:

Memory Size: Must be 4Kbit
Memory Organization: Must be 512 x 8
Memory Interface: Must be SPI
Package Type: Must be 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant

Clock frequency, voltage supply range, write cycle time, and operating temperature are secondary parameters that may vary among substitutes. Higher clock frequencies are backward compatible with lower frequency applications. Voltage supply ranges may differ; substitutes with lower minimum voltage or higher maximum voltage provide extended operational flexibility. Write cycle time variations do not affect functional compatibility in standard applications.

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temperature (°C)	Write Cycle Time (ms)	Inventory (Pcs)	Product Status
25LC040XT-I/ST	Microchip Technology	2	2.5 ~ 5.5	-40 ~ 85	5	3468	Active
25LC040AT-I/ST	Microchip Technology	10	2.5 ~ 5.5	-40 ~ 85	5	3362	Active
AT25040B-XHL-T	Microchip Technology	20	1.8 ~ 5.5	-40 ~ 85	5	18647	Active
CAT25040YI-GT3	onsemi	20	1.8 ~ 5.5	-40 ~ 85	5	60300	Active
M95040-DFDW6TP	STMicroelectronics	20	1.7 ~ 5.5	-40 ~ 85	5	4760	Active
M95040-DRDW3TP/K	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 125	4	18871	Active
M95040-DRDW8TP/K	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 105	4	4532	Active
M95040-RDW6TP	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 85	5	15964	Active
M95040-WDW6TP	STMicroelectronics	20	2.5 ~ 5.5	-40 ~ 85	5	1437	Active
R1EX25004ATA00I#S0	Renesas Electronics Corporation	5	1.8 ~ 5.5	-40 ~ 85	5	3811	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection among substitutes should prioritize inventory availability and voltage supply range compatibility with the target application.

For applications requiring extended temperature operation beyond -40°C to 85°C, M95040-DRDW3TP/K supports -40°C to 125°C operation. For automotive-grade qualification, M95040-DRDW3TP/K and M95040-DRDW8TP/K carry AEC-Q100 certification.

Clock frequency selection depends on system requirements. The 25LC040XT-I/ST operates at 2 MHz; higher frequency substitutes (10 MHz and 20 MHz variants) are backward compatible with 2 MHz applications. Voltage supply range compatibility must be verified; substitutes with 1.7V or 1.8V minimum voltage support lower supply applications than the original 2.5V minimum.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz part as a direct replacement for the 2 MHz 25LC040XT-I/ST?

A: Yes. Higher clock frequency parts are functionally compatible with lower frequency applications. The SPI interface operates at the speed commanded by the host controller, so a 20 MHz capable device functions correctly in a 2 MHz system.

Q: What is the difference between the voltage supply ranges listed?

A: The 25LC040XT-I/ST operates from 2.5V to 5.5V. Substitutes with 1.8V or 1.7V minimum voltage support operation in lower voltage systems. All parts support the full 5.5V maximum. Verify your application voltage before selection.

Q: Are all substitute parts in the same 8-TSSOP package?

A: Yes. All listed substitutes use the 8-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive electronics qualification standard. M95040-DRDW3TP/K and M95040-DRDW8TP/K carry this certification, indicating suitability for automotive applications with extended temperature ranges.

Q: Which substitute has the highest inventory availability?

A: CAT25040YI-GT3 from onsemi has the highest inventory at 60,300 pieces, followed by AT25040B-XHL-T from Microchip Technology at 18,647 pieces.

Q: Can I substitute based on write cycle time differences?

A: Write cycle time variations (4ms vs 5ms) do not affect functional compatibility. Both values are acceptable for standard EEPROM applications. Selection should prioritize other parameters such as voltage range and temperature rating.

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