M95040-WDW6TP EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The M95040-WDW6TP is a 4Kbit EEPROM memory integrated circuit manufactured by STMicroelectronics. This non-volatile memory device operates via SPI interface at 20 MHz clock frequency and is housed in an 8-TSSOP surface mount package. The component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical specifications are maintained across the same memory category, package type, and interface protocol. Alternative components may be required due to inventory availability, packaging format preferences, or extended operating temperature ranges for specific applications.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	SPI
Clock Frequency	20 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
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the M95040-WDW6TP is determined by the following critical parameters:

Primary Substitution Criteria:

Memory capacity: 4Kbit
Memory organization: 512 x 8 bit structure
Interface protocol: SPI serial communication
Package format: 8-TSSOP surface mount
Voltage supply compatibility: Minimum 2.5V operation required

Secondary Compatibility Factors:

Clock frequency: 20 MHz operation capability
Write cycle time: 5ms specification
Operating temperature range: -40°C to 85°C minimum
RoHS3 compliance status
MSL rating: Level 1 or equivalent

Substitute parts are grouped into two categories: STMicroelectronics M95040 series variants with identical base specifications, and Microchip Technology 25LC040 series devices with equivalent memory architecture and SPI interface. Parts with reduced clock frequency (2 MHz or 10 MHz) or extended temperature ranges (105°C or 125°C) are listed as functional alternatives where application requirements permit deviation from the primary specification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Write Cycle Time	Package	Packaging Format
M95040-WDW6TP	STMicroelectronics	4Kbit	20 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tape & Reel
M95040-DFDW6TP	STMicroelectronics	4Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tape & Reel
M95040-DRDW3TP/K	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Cut Tape & Digi-Reel
M95040-DRDW8TP/K	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 105°C	4ms	8-TSSOP	Tape & Reel
M95040-RDW6TP	STMicroelectronics	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Cut Tape & Digi-Reel
25LC040A-I/ST	Microchip Technology	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tube
25LC040AT-I/ST	Microchip Technology	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tape & Reel
25LC040AX-I/ST	Microchip Technology	4Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tube
25LC040XT-I/ST	Microchip Technology	4Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tape & Reel
AT25040B-XHL-B	Microchip Technology	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tube
AT25040B-XHL-T	Microchip Technology	4Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Tape & Reel

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications):

M95040-RDW6TP and M95040-DFDW6TP are direct functional equivalents to M95040-WDW6TP. Both maintain 4Kbit capacity, 20 MHz SPI operation, 8-TSSOP packaging, and -40°C to 85°C operating range. M95040-DFDW6TP extends voltage supply range to 1.7V minimum, providing enhanced low-voltage operation capability. M95040-RDW6TP operates from 1.8V minimum and is available in Cut Tape & Digi-Reel packaging format.

Extended Temperature Range Alternatives:

M95040-DRDW3TP/K and M95040-DRDW8TP/K are automotive-grade variants qualified to AEC-Q100 standard with extended operating temperature to 125°C and 105°C respectively. These parts feature reduced write cycle time (4ms) and lower minimum voltage (1.8V). Selection of these variants is appropriate for applications requiring automotive qualification or extended temperature operation.

Microchip Technology Equivalents:

AT25040B-XHL-B and AT25040B-XHL-T provide 20 MHz SPI operation with 4Kbit capacity in 8-TSSOP package. Both operate across -40°C to 85°C range with 1.8V minimum supply voltage. MSL rating of 3 (168 hours) differs from the primary part's MSL 1 rating.

25LC040AT-I/ST and 25LC040A-I/ST operate at 10 MHz clock frequency, reducing maximum data throughput compared to the 20 MHz specification. These parts maintain identical voltage supply range (2.5V ~ 5.5V) and temperature operating window (-40°C ~ 85°C).

25LC040XT-I/ST operates at 2 MHz clock frequency and is suitable only for applications with reduced speed requirements.

Product Status and Compliance:

All listed substitute parts maintain Active product status and ROHS3 compliance. M95040-WDW6TP and 25LC040 series parts are verified as DiGi-Electronics Programmable. Automotive-grade M95040-DRDW variants carry AEC-Q100 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can M95040-RDW6TP replace M95040-WDW6TP in existing designs?

A: Yes. M95040-RDW6TP maintains identical memory capacity (4Kbit), SPI interface, 20 MHz clock frequency, 8-TSSOP package, and -40°C to 85°C operating temperature. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and minimum supply voltage (1.8V versus 2.5V). Designs operating above 1.8V supply voltage experience no functional difference.

Q: What is the significance of the voltage supply range difference between M95040-WDW6TP (2.5V ~ 5.5V) and M95040-DFDW6TP (1.7V ~ 5.5V)?

A: M95040-DFDW6TP supports operation at lower supply voltages down to 1.7V, whereas M95040-WDW6TP requires minimum 2.5V. Applications operating at voltages between 1.7V and 2.5V require M95040-DFDW6TP or equivalent low-voltage variant. Applications operating above 2.5V are compatible with both parts.

Q: Are Microchip 25LC040 series parts direct replacements for STMicroelectronics M95040 parts?

A: 25LC040 series parts share identical 4Kbit capacity, 512 x 8 organization, SPI interface, and 8-TSSOP package. However, clock frequency differs: 25LC040A variants operate at 10 MHz (versus 20 MHz for M95040-WDW6TP), and 25LC040XT operates at 2 MHz. Direct substitution is possible only in applications where reduced clock frequency is acceptable. AT25040B variants operate at 20 MHz and provide closer functional equivalence.

Q: What packaging format differences exist among substitute parts?

A: M95040-WDW6TP is supplied in Tape & Reel (TR) format. Alternatives include Cut Tape & Digi-Reel (M95040-RDW6TP, M95040-DRDW3TP/K), standard Tape & Reel (M95040-DFDW6TP, M95040-DRDW8TP/K, 25LC040AT-I/ST, 25LC040XT-I/ST, AT25040B-XHL-T), and Tube (25LC040A-I/ST, 25LC040AX-I/ST, AT25040B-XHL-B). Packaging format selection depends on assembly process requirements and quantity handling.

Q: Why do automotive-grade variants (M95040-DRDW3TP/K, M95040-DRDW8TP/K) have faster write cycle times (4ms versus 5ms)?

A: Write cycle time specification is provided as stated in the input parameters. M95040-DRDW variants specify 4ms write cycle time while standard variants specify 5ms. Both meet the functional requirement of non-volatile memory write operation within their respective timing specifications.

Q: Can M95040-DRDW3TP/K be used in non-automotive applications?

A: Yes. M95040-DRDW3TP/K is an automotive-qualified variant with AEC-Q100 certification, but this qualification does not restrict use in non-automotive applications. The part maintains identical 4Kbit capacity, 20 MHz SPI operation, and 8-TSSOP package. Extended operating temperature range (-40°C to 125°C) provides additional margin for non-automotive applications with elevated temperature requirements.

Q: What is the impact of MSL rating differences between M95040-WDW6TP (MSL 1) and AT25040B variants (MSL 3)?

A: MSL 1 (Unlimited) indicates no moisture sensitivity limitation during storage. MSL 3 (168 hours) specifies maximum floor life of 168 hours after moisture exposure before reflow soldering. Applications with extended storage periods or high-humidity environments benefit from MSL 1 rated parts. AT25040B variants with MSL 3 rating require moisture control during storage and handling.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the primary M95040-WDW6TP specification. REACH status is Unaffected for all parts.

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