BR95040-WDW6TP EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The BR95040-WDW6TP is a 4Kbit EEPROM memory IC manufactured by Rohm Semiconductor, featuring SPI interface operation at 5 MHz with 8-TSSOP surface mount packaging. This component is classified as obsolete product status. Due to its obsolete classification, identifying functionally equivalent substitute parts is essential for design continuity, production support, and long-term component availability in applications requiring 4Kbit SPI EEPROM memory storage.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Format	EEPROM
Memory Interface	SPI
Clock Frequency	5 MHz
Memory Organization	512 x 8
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BR95040-WDW6TP is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 4Kbit (fixed requirement)
Memory Format: EEPROM (fixed requirement)
Memory Interface: SPI (fixed requirement)
Memory Organization: 512 x 8 (fixed requirement)
Package / Case: 8-TSSOP with 0.173" width, 4.40mm Width (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)
Write Cycle Time: 5ms (fixed requirement)

Allowable Parameter Variations:

Clock Frequency: May be equal to or greater than 5 MHz
Voltage Supply Range: Must encompass or be compatible with 2.5V ~ 5.5V
Operating Temperature: May extend beyond -40°C ~ 85°C
Product Status: Active status preferred for long-term availability
RoHS Compliance: ROHS3 Compliant required

Substitute parts are grouped based on clock frequency capability, voltage supply compatibility, and temperature rating, as these parameters determine functional interchangeability within the specified application constraints.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temp (°C)	Package	Product Status
BR95040-WDW6TP	Rohm Semiconductor	4Kbit	5	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Obsolete
25AA040AT-I/ST	Microchip Technology	4Kbit	10	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25AA040AXT-I/ST	Microchip Technology	4Kbit	10	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25AA040XT-I/ST	Microchip Technology	4Kbit	1	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25LC040AT-E/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	8-TSSOP	Active
25LC040AT-I/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25LC040AXT-E/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 125	8-TSSOP	Active
25LC040AXT-I/ST	Microchip Technology	4Kbit	10	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25LC040XT-I/ST	Microchip Technology	4Kbit	2	2.5 ~ 5.5	-40 ~ 85	8-TSSOP	Active
25LC040XT/ST	Microchip Technology	4Kbit	2	2.5 ~ 5.5	0 ~ 70	8-TSSOP	Active
AT25040B-XHL-T	Microchip Technology	4Kbit	20	1.8 ~ 5.5	-40 ~ 85	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 25LC040AT-I/ST and 25LC040AXT-I/ST are the most direct substitutes for the BR95040-WDW6TP. Both parts maintain identical voltage supply range (2.5V ~ 5.5V), matching operating temperature range (-40°C ~ 85°C), and feature 10 MHz clock frequency operation, which exceeds the original 5 MHz requirement. Both are active product status with ROHS3 compliance and verified programmability certification.

Secondary Substitutes (Extended Temperature or Frequency):

The 25LC040AT-E/ST and 25LC040AXT-E/ST offer extended operating temperature range (-40°C ~ 125°C) while maintaining voltage supply compatibility (2.5V ~ 5.5V) and 10 MHz clock frequency. These parts are suitable for applications requiring enhanced thermal performance.

The AT25040B-XHL-T provides 20 MHz clock frequency operation with 1.8V ~ 5.5V voltage supply range and -40°C ~ 85°C operating temperature. This part supports higher-speed SPI communication while maintaining temperature compatibility with the original specification.

Compatibility Considerations:

All substitute parts listed maintain the 8-TSSOP package format, 4Kbit memory size, 512 x 8 organization, SPI interface, and 5ms write cycle time. Parts with clock frequencies exceeding 5 MHz (10 MHz, 20 MHz) are backward compatible with 5 MHz operation. The 25AA040 series parts with 1.8V minimum supply voltage provide broader voltage compatibility but require verification of application-specific voltage requirements.

The 25LC040XT/ST operates within 0°C ~ 70°C temperature range, which is narrower than the original specification and suitable only for applications not requiring -40°C operation.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher clock frequency than the original BR95040-WDW6TP?

A: Yes. The substitute parts with 10 MHz or 20 MHz clock frequency are backward compatible with 5 MHz operation. Higher clock frequency capability does not prevent operation at lower speeds. The SPI interface will function correctly at the original 5 MHz specification.

Q: What is the difference between 25AA040 and 25LC040 series parts?

A: The primary difference is voltage supply range. The 25AA040 series operates at 1.8V ~ 5.5V, while the 25LC040 series operates at 2.5V ~ 5.5V. The BR95040-WDW6TP specifies 2.5V ~ 5.5V, making 25LC040 series parts more directly compatible. Both series maintain identical memory capacity, organization, interface, and package specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original BR95040-WDW6TP specification.

Q: Does the 8-TSSOP package remain consistent across all substitutes?

A: Yes. All substitute parts use 8-TSSOP packaging with 0.173" width and 4.40mm Width, ensuring mechanical and electrical compatibility with existing PCB layouts and socket designs.

Q: Which substitute part should I select if my application requires -40°C operation?

A: The 25LC040XT/ST operates only within 0°C ~ 70°C and is not suitable. Select from: 25AA040AT-I/ST, 25AA040AXT-I/ST, 25AA040XT-I/ST, 25LC040AT-E/ST, 25LC040AT-I/ST, 25LC040AXT-E/ST, 25LC040AXT-I/ST, 25LC040XT-I/ST, or AT25040B-XHL-T. All these parts support -40°C minimum operating temperature.

Q: What is the significance of "Tape & Reel (TR)" packaging designation?

A: Tape & Reel packaging indicates the component is supplied on continuous tape for automated assembly processes. This is a supply format designation and does not affect electrical or mechanical compatibility. The underlying component package remains 8-TSSOP.

Q: Can I substitute the BR95040-WDW6TP with a part having extended temperature range like 25LC040AT-E/ST?

A: Yes. The 25LC040AT-E/ST operates within -40°C ~ 125°C, which encompasses the original -40°C ~ 85°C specification. Extended temperature capability provides additional operational margin and is functionally compatible with the original design.

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