AT25SF641-MHB-T Equivalent & Substitute Parts

Part Overview

The AT25SF641-MHB-T is a 64Mbit NOR Flash memory IC manufactured by Renesas Electronics Corporation, featuring SPI and Quad I/O interface capabilities with a maximum clock frequency of 104 MHz. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part is housed in an 8-UDFN (5x6) surface mount package with exposed pad configuration.

Key Parameters

Parameter	Value
Memory Size	64Mbit
Memory Organization	8M x 8
Memory Interface	SPI - Quad I/O, QPI
Clock Frequency	104 MHz
Supply Voltage	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package Type	8-UDFN Exposed Pad
Write Cycle Time (Page)	5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF641-MHB-T is determined by the following critical parameters:

Memory capacity must equal 64Mbit with 8M x 8 organization
Memory interface must support SPI with Quad I/O capability
Supply voltage range must encompass 2.7V ~ 3.6V
Operating temperature range must cover -40°C ~ 85°C
Package must be compatible with 8-pin surface mount configurations
RoHS3 compliance is required for regulatory alignment

Two substitute parts meet these criteria: AT25SF641B-MHB-T (Renesas Electronics Corporation) and W25Q64JVZPIQ (Winbond Electronics). Both maintain identical memory capacity, organization, interface protocol, voltage specifications, and temperature range. Package variations exist between the main part and substitutes, requiring mechanical validation during integration.

Parameter Comparison

Parameter	AT25SF641-MHB-T	AT25SF641B-MHB-T	W25Q64JVZPIQ
Memory Size	64Mbit	64Mbit	64Mbit
Memory Organization	8M x 8	8M x 8	8M x 8
Memory Interface	SPI - Quad I/O, QPI	SPI - Quad I/O	SPI - Quad I/O
Clock Frequency	104 MHz	108 MHz	133 MHz
Supply Voltage	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-WDFN Exposed Pad
Write Cycle Time (Page)	5ms	3ms	3ms
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT25SF641B-MHB-T is the primary substitute option, maintaining identical package geometry (8-UDFN 5x6) and electrical specifications while offering active product status and improved write performance (3ms page write cycle versus 5ms). This part provides direct mechanical and electrical compatibility with minimal design modification risk.

W25Q64JVZPIQ serves as an alternative substitute with verified programmability status and superior clock frequency performance (133 MHz). However, package geometry differs (8-WSON 6x5 versus 8-UDFN 5x6), requiring PCB layout and footprint validation. This option is suitable for designs where package size variation is acceptable and higher performance is beneficial.

Both substitute parts maintain ROHS3 compliance and identical memory capacity, organization, interface protocol, voltage range, and temperature specifications as the original part.

Frequently Asked Questions (FAQ)

Q: Can AT25SF641B-MHB-T directly replace AT25SF641-MHB-T without PCB modifications?

A: Yes. Both parts use identical 8-UDFN (5x6) package geometry with exposed pad configuration. Electrical specifications and pinout are compatible. No PCB layout changes are required.

Q: What is the primary difference between AT25SF641-MHB-T and AT25SF641B-MHB-T?

A: AT25SF641B-MHB-T is the active production variant with improved write cycle time (3ms page write versus 5ms) and higher clock frequency (108 MHz versus 104 MHz). The original part is obsolete.

Q: Can W25Q64JVZPIQ be used as a substitute?

A: W25Q64JVZPIQ meets all electrical and functional requirements but uses 8-WSON (6x5) package instead of 8-UDFN (5x6). PCB footprint and layout must be validated for mechanical compatibility. This part offers superior performance with 133 MHz clock frequency.

Q: Are all three parts RoHS3 compliant?

A: Yes. AT25SF641-MHB-T, AT25SF641B-MHB-T, and W25Q64JVZPIQ are all ROHS3 compliant.

Q: What is the memory interface difference between the main part and substitutes?

A: AT25SF641-MHB-T supports SPI with Quad I/O and QPI modes. AT25SF641B-MHB-T and W25Q64JVZPIQ support SPI with Quad I/O. All three parts maintain full Quad I/O compatibility for data transfer operations.

Q: Which substitute offers the best performance?

A: W25Q64JVZPIQ provides the highest clock frequency at 133 MHz with 6 ns access time and 3ms page write cycle. AT25SF641B-MHB-T offers direct package compatibility with 108 MHz operation and 3ms page write cycle.

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