Equivalent & Substitute Parts for 25C040XT-I/ST

Part Overview

The 25C040XT-I/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-TSSOP surface mount packaging. This device is classified as Active product status and is ROHS3 compliant. The part operates across a supply voltage range of 4.5V to 5.5V and maintains functionality across the industrial temperature range of -40°C to 85°C. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications requiring alternative electrical specifications or manufacturer options while maintaining core functional compatibility.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	3 MHz
Write Cycle Time	5ms
Voltage Supply Range	4.5V ~ 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 25C040XT-I/ST is determined by strict alignment with the following core parameters: 4Kbit memory capacity, 512 x 8 memory organization, SPI serial interface, 8-TSSOP package configuration, surface mount mounting type, and ROHS3 compliance. Substitute parts must maintain identical memory architecture and physical packaging to ensure PCB compatibility and functional interchangeability. Clock frequency variations are permitted when the substitute part operates at equal or higher frequency than the primary part, ensuring protocol timing requirements are met. Supply voltage ranges may extend beyond the primary part specification provided the substitute supports the primary part's operating range. Operating temperature ranges may extend provided the substitute maintains the primary part's minimum and maximum temperature boundaries. Write cycle time must not exceed the primary part specification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temp (°C)	Write Cycle (ms)	Package	Product Status
25C040XT-I/ST	Microchip Technology	4Kbit	3	4.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
25LC040AT-I/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
25LC040XT-I/ST	Microchip Technology	4Kbit	2	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
AT25040B-XHL-T	Microchip Technology	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
CAT25040YI-GT3	onsemi	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
M95040-DFDW6TP	STMicroelectronics	4Kbit	20	1.7 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
M95040-DRDW3TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 125	4	8-TSSOP	Active
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 105	4	8-TSSOP	Active
M95040-RDW6TP	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
M95040-WDW6TP	STMicroelectronics	4Kbit	20	2.5 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active
R1EX25004ATA00I#S0	Renesas Electronics Corporation	4Kbit	5	1.8 ~ 5.5	-40 ~ 85	5	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the primary 25C040XT-I/ST device. Microchip Technology 25LC040AT-I/ST and 25LC040XT-I/ST variants provide direct manufacturer alternatives with extended voltage supply ranges supporting lower operating voltages while maintaining identical package and memory architecture. STMicroelectronics M95040 series parts offer higher clock frequency operation (20 MHz) with automotive-grade qualification available on M95040-DRDW3TP/K and M95040-DRDW8TP/K variants, suitable for applications requiring extended temperature ranges or AEC-Q100 certification. onsemi CAT25040YI-GT3 provides cross-manufacturer compatibility with equivalent electrical specifications. Renesas Electronics R1EX25004ATA00I#S0 supports mid-range clock frequency operation at 5 MHz. Selection should prioritize parts matching the primary device's voltage supply range (4.5V minimum) unless application requirements permit extended lower voltage operation.

Frequently Asked Questions (FAQ)

Q: Can 25LC040XT-I/ST substitute for 25C040XT-I/ST? A: Yes. Both parts share identical 4Kbit memory capacity, 512 x 8 organization, SPI interface, 8-TSSOP packaging, and operating temperature range. The 25LC040XT-I/ST operates at 2 MHz clock frequency, which is lower than the primary part's 3 MHz specification. The substitute's extended voltage supply range (2.5V to 5.5V) encompasses the primary part's 4.5V to 5.5V range, ensuring full compatibility.

Q: What is the significance of clock frequency differences among substitute parts? A: Clock frequency determines the maximum SPI communication speed. Substitute parts operating at equal or higher clock frequencies than the primary 3 MHz specification maintain full protocol compatibility. Parts with lower clock frequencies (such as 25LC040XT-I/ST at 2 MHz) operate within the primary part's timing envelope and remain functionally compatible.

Q: Are automotive-qualified variants suitable for non-automotive applications? A: Yes. Automotive-qualified parts such as M95040-DRDW3TP/K and M95040-DRDW8TP/K meet AEC-Q100 standards and extended temperature specifications. These parts are fully compatible with standard industrial applications and provide additional reliability margin.

Q: How does voltage supply range affect substitution eligibility? A: The primary 25C040XT-I/ST operates from 4.5V to 5.5V. Substitute parts with extended lower voltage ranges (such as 1.8V minimum) remain compatible provided they support the primary part's minimum 4.5V operating point. Substitutes must support the full 4.5V to 5.5V range of the primary device.

Q: Is the 8-TSSOP package identical across all substitute parts? A: Yes. All substitute parts utilize 8-TSSOP packaging with 0.173" width and 4.40mm body dimension, ensuring direct PCB footprint compatibility and identical mounting requirements.

Q: What is the impact of write cycle time variations? A: The primary part specifies 5ms write cycle time. Substitute parts with equal or faster write cycle times (such as M95040 variants at 4ms) maintain full compatibility. Write cycle time does not affect functional interchangeability in standard applications.

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