Equivalent & Substitute Parts for 25C040T-E/SN

Part Overview

The 25C040T-E/SN is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-SOIC surface mount packaging. This device is classified as Active product status and is RoHS3 compliant. Substitute parts are necessary when Cut Tape packaging is unavailable, when higher clock frequency operation is required, or when alternative manufacturer sourcing is needed for supply chain continuity.

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 ~ 125°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 25C040T-E/SN is determined by the following critical parameters: memory size (4Kbit), memory organization (512 x 8), SPI interface, 8-SOIC package footprint, surface mount technology, and RoHS3 compliance. Parts are grouped into three categories based on operational characteristics:

Category 1: Direct Microchip Technology Substitutes — Parts maintaining identical memory specifications with packaging or temperature range variations. The 25C040/SN operates at the same 3 MHz frequency but uses Tube packaging instead of Cut Tape.

Category 2: Higher Frequency Microchip Technology Substitutes — The 25LC040AT-E/SN operates at 10 MHz with extended voltage supply range (2.5V ~ 5.5V) and maintains the -40°C ~ 125°C temperature range. This part is backward compatible in applications not requiring the 3 MHz specification.

Category 3: Alternative Manufacturer Substitutes — Parts from STMicroelectronics and onsemi offering 4Kbit SPI EEPROM in 8-SOIC packaging. STMicroelectronics M95040 series operates at 20 MHz with write cycle times of 4-5ms. onsemi CAT25040VI-GT3 operates at unspecified frequency with 5ms write cycle time. The Rohm Semiconductor BR25H040F-2CE2 operates at 10 MHz with 4ms write cycle time and includes AEC-Q100 automotive qualification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Write Cycle Time	Package	Product Status
25C040T-E/SN	Microchip Technology	4Kbit	3 MHz	4.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-SOIC	Active
25C040/SN	Microchip Technology	4Kbit	3 MHz	4.5V ~ 5.5V	0°C ~ 70°C	5ms	8-SOIC	Active
25LC040AT-E/SN	Microchip Technology	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-SOIC	Active
BR25H040F-2CE2	Rohm Semiconductor	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	4ms	8-SOIC	Active
CAT25040VI-G	onsemi	4Kbit	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	Obsolete
CAT25040VI-GT3	onsemi	4Kbit	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	Active
M95040-DRMN3TP/K	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-SOIC	Active
M95040-RMN6TP	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	Active
M95040-WMN6P	STMicroelectronics	4Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	Active
M95040-WMN6TP	STMicroelectronics	4Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications: The 25C040/SN from Microchip Technology is the primary substitute when Cut Tape packaging is unavailable. This part maintains 3 MHz operation and 5ms write cycle time. Note the operating temperature range is restricted to 0°C ~ 70°C compared to the original -40°C ~ 125°C specification.

For Extended Temperature Range Applications: The 25LC040AT-E/SN maintains the -40°C ~ 125°C operating range with increased clock frequency (10 MHz) and lower minimum supply voltage (2.5V). This part is suitable for applications requiring the full temperature range of the original device.

For Automotive and High-Reliability Applications: The BR25H040F-2CE2 from Rohm Semiconductor carries AEC-Q100 automotive qualification and operates across -40°C ~ 125°C with 10 MHz frequency and 4ms write cycle time. The M95040-DRMN3TP/K from STMicroelectronics also provides AEC-Q100 qualification with 20 MHz operation and -40°C ~ 125°C temperature range.

For General-Purpose Substitution: The CAT25040VI-GT3 from onsemi is an Active product with 49,300 units in stock, offering 1.8V ~ 5.5V supply range and 8-SOIC packaging. Operating temperature is limited to -40°C ~ 85°C.

Parts to Avoid: The CAT25040VI-G is classified as Obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can the 25C040/SN replace the 25C040T-E/SN in all applications?

A: The 25C040/SN is electrically compatible with identical memory size, organization, SPI interface, and 3 MHz operation. The primary difference is operating temperature range: 0°C ~ 70°C versus -40°C ~ 125°C. Applications operating within 0°C ~ 70°C can use this substitute. Applications requiring -40°C operation must use alternatives such as 25LC040AT-E/SN or M95040 series parts.

Q: What is the advantage of using 25LC040AT-E/SN over the original part?

A: The 25LC040AT-E/SN operates at 10 MHz (versus 3 MHz) and accepts lower minimum supply voltage (2.5V versus 4.5V). It maintains the full -40°C ~ 125°C temperature range. This part is backward compatible in applications not requiring the 3 MHz specification and offers improved performance headroom.

Q: Are STMicroelectronics M95040 parts compatible with the 25C040T-E/SN?

A: M95040 series parts share 4Kbit memory size, 512 x 8 organization, SPI interface, and 8-SOIC packaging. They operate at 20 MHz with 4-5ms write cycle times. Voltage supply ranges vary by variant (1.8V ~ 5.5V or 2.5V ~ 5.5V). Operating temperature ranges are -40°C ~ 125°C or -40°C ~ 85°C depending on part number. These parts are functionally compatible but operate at higher clock frequencies.

Q: What is the difference between CAT25040VI-G and CAT25040VI-GT3?

A: Both parts share identical electrical specifications: 4Kbit memory, SPI interface, 1.8V ~ 5.5V supply, -40°C ~ 85°C operation, and 8-SOIC packaging. The primary difference is product status: CAT25040VI-G is Obsolete while CAT25040VI-GT3 is Active with 49,300 units in stock. New designs must use CAT25040VI-GT3.

Q: Can I use BR25H040F-2CE2 in non-automotive applications?

A: Yes. The BR25H040F-2CE2 meets all electrical and mechanical requirements for the 25C040T-E/SN application space. AEC-Q100 qualification indicates automotive-grade reliability but does not restrict use in general-purpose applications. This part offers 10 MHz operation, 4ms write cycle time, and -40°C ~ 125°C temperature range.

Q: Which substitute offers the highest clock frequency?

A: The M95040 series from STMicroelectronics operates at 20 MHz, the highest among all listed substitutes. Available variants include M95040-DRMN3TP/K, M95040-RMN6TP, M95040-WMN6P, and M95040-WMN6TP with different packaging and temperature specifications.

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