Equivalent & Substitute Parts for 25LC040AXT-I/ST

Part Overview

The 25LC040AXT-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 supply voltage range of 2.5V to 5.5V and maintains functionality over the industrial temperature range of -40°C to 85°C. The part is ROHS3 compliant and carries Active product status with verified programmability through DiGi-Electronics.

Equivalent and substitute parts are identified based on matching core electrical and mechanical parameters: 4Kbit memory capacity, 512 x 8 memory organization, SPI interface protocol, 8-TSSOP package geometry, and compatible operating temperature ranges. Substitution eligibility is determined by alignment of these critical specifications.

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

Substitute parts for the 25LC040AXT-I/ST are grouped into three categories based on clock frequency compatibility and voltage supply specifications:

Category 1: Direct Electrical Equivalents (10 MHz Operation) Parts operating at 10 MHz with 2.5V to 5.5V supply range provide direct functional equivalence. These include 25LC040AX-I/ST (Tube packaging) and CAV25040YE-GT3 (automotive-qualified variant with extended temperature to 125°C).

Category 2: Higher Frequency Variants (20 MHz Operation) Parts rated for 20 MHz operation include AT25040B-XHL-B, AT25040B-XHL-T, CAT25040YI-GT3, M95040-DFDW6TP, M95040-DRDW3TP/K, and M95040-DRDW8TP/K. These devices support faster clock speeds and are backward compatible in applications not requiring the full 10 MHz specification. Supply voltage ranges vary: AT25040B variants operate at 1.8V to 5.5V; CAT25040YI-GT3 operates at 1.8V to 5.5V; M95040 variants operate at 1.7V to 5.5V or 1.8V to 5.5V.

Category 3: Lower Frequency Variant (2 MHz Operation) The 25LC040XT-I/ST operates at 2 MHz with 2.5V to 5.5V supply range, suitable for applications with reduced speed requirements.

All substitute parts maintain 4Kbit capacity, 512 x 8 organization, SPI interface, 8-TSSOP package, and -40°C to 85°C operating temperature range (except CAV25040YE-GT3 which extends to 125°C).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temp (°C)	Package	Packaging Type	Product Status
25LC040AXT-I/ST	Microchip	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
25LC040AX-I/ST	Microchip	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Tube	Active
25LC040AT-I/ST	Microchip	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
25LC040XT-I/ST	Microchip	4Kbit	2	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
AT25040B-XHL-B	Microchip	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Tube	Active
AT25040B-XHL-T	Microchip	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
CAT25040YI-GT3	onsemi	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
CAV25040YE-GT3	onsemi	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	8-TSSOP	Tape & Reel	Active
M95040-DFDW6TP	STMicroelectronics	4Kbit	20	1.7 ~ 5.5	-40 ~ 85	8-TSSOP	Tape & Reel	Active
M95040-DRDW3TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 125	8-TSSOP	Cut Tape & Digi-Reel	Active
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20	1.8 ~ 5.5	-40 ~ 105	8-TSSOP	Tape & Reel	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance) Select 25LC040AX-I/ST or 25LC040AT-I/ST when maintaining exact 10 MHz clock frequency and 2.5V to 5.5V supply voltage is required. Both parts carry Active product status. The choice between these depends on packaging preference: 25LC040AX-I/ST is supplied in Tube packaging, while 25LC040AT-I/ST is supplied in Tape & Reel format.

For Automotive Applications CAV25040YE-GT3 (onsemi) and M95040-DRDW3TP/K (STMicroelectronics) are qualified to AEC-Q100 automotive standards. CAV25040YE-GT3 maintains 10 MHz operation with extended temperature range to 125°C. M95040-DRDW3TP/K operates at 20 MHz with 4ms write cycle time and -40°C to 125°C temperature range.

For Higher Speed Applications AT25040B-XHL-T, CAT25040YI-GT3, M95040-DFDW6TP, and M95040-DRDW8TP/K support 20 MHz clock frequency. These parts are backward compatible in applications where the 10 MHz specification is not a limiting factor. All maintain 4Kbit capacity and 8-TSSOP packaging. Supply voltage ranges extend to 1.8V minimum, providing enhanced low-voltage operation compared to the 25LC040AXT-I/ST.

For Lower Speed Applications 25LC040XT-I/ST operates at 2 MHz with identical 2.5V to 5.5V supply range and -40°C to 85°C temperature range, suitable for applications with reduced clock speed requirements.

All substitute parts maintain ROHS3 compliance and Active product status.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz part as a direct replacement for the 25LC040AXT-I/ST? A: Yes. Parts rated for 20 MHz operation (AT25040B-XHL-T, CAT25040YI-GT3, M95040-DFDW6TP, M95040-DRDW8TP/K) are backward compatible and will function correctly in applications designed for 10 MHz operation. The higher clock rating does not affect compatibility.

Q: What is the difference between 25LC040AX-I/ST and 25LC040AT-I/ST? A: Both parts are electrically identical with 10 MHz operation, 2.5V to 5.5V supply, and -40°C to 85°C temperature range. The difference is packaging: 25LC040AX-I/ST is supplied in Tube format, while 25LC040AT-I/ST is supplied in Tape & Reel format.

Q: Are automotive-qualified parts suitable for industrial applications? A: Yes. Automotive-qualified parts (CAV25040YE-GT3, M95040-DRDW3TP/K, M95040-DRDW8TP/K) meet or exceed industrial specifications and are suitable for industrial use. These parts typically offer extended temperature ranges and enhanced reliability.

Q: What is the minimum supply voltage for substitute parts? A: The 25LC040AXT-I/ST operates at 2.5V minimum. Higher-frequency variants (20 MHz) typically support 1.8V or 1.7V minimum supply voltage, providing greater flexibility in low-voltage applications.

Q: Can I substitute a 2 MHz part (25LC040XT-I/ST) for the 10 MHz original? A: The 25LC040XT-I/ST is not a direct substitute but rather a lower-speed variant. Use only if your application does not require 10 MHz clock frequency operation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the environmental compliance of the 25LC040AXT-I/ST.

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