AT25DF641A-MH-Y Equivalent & Substitute Parts

Part Overview

The AT25DF641A-MH-Y is a 64Mbit Serial Peripheral Interface (SPI) Flash memory IC manufactured by Renesas Electronics Corporation. This non-volatile memory device operates at 100 MHz and is packaged in an 8-UDFN (5x6) surface mount configuration with an exposed pad. The part is currently discontinued at DiGi Electronics, making equivalent substitute components necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile FLASH
Memory Size	64Mbit
Memory Organization	256 Bytes x 32K pages
Memory Interface	SPI
Clock Frequency	100 MHz
Write Cycle Time (Page)	6ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	8-UDFN Exposed Pad (5x6)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AT25DF641A-MH-Y is determined by the following critical parameters:

Memory Capacity: 64Mbit capacity requirement
Memory Interface: SPI protocol compatibility
Voltage Supply Range: 2.7V ~ 3.6V operating range
Operating Temperature: -40°C ~ 85°C range
Mounting Type: Surface mount configuration
Package Compatibility: Physical dimensions and pin configuration
Compliance Standards: RoHS3 compliance and REACH status

The W25Q64JVZPIQ qualifies as a substitute based on matching memory capacity, voltage supply range, operating temperature range, and compliance certifications. While the substitute offers enhanced specifications (133 MHz clock frequency, Quad I/O capability, faster access time), these represent functional improvements rather than deviations from the core electrical and mechanical requirements.

Parameter Comparison

Parameter	AT25DF641A-MH-Y	W25Q64JVZPIQ	Compatibility
Memory Size	64Mbit	64Mbit	Match
Memory Type	Non-Volatile FLASH	Non-Volatile FLASH - NOR	Match
Memory Interface	SPI	SPI - Quad I/O	Compatible (Quad I/O is SPI superset)
Clock Frequency	100 MHz	133 MHz	Compatible (Higher frequency)
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	Match
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Type	8-UDFN Exposed Pad (5x6)	8-WSON Exposed Pad (6x5)	Different package footprint
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
MSL Rating	1 (Unlimited)	3 (168 Hours)	Different moisture sensitivity

Engineering Selection Recommendations

The W25Q64JVZPIQ serves as a functional substitute for the discontinued AT25DF641A-MH-Y based on electrical parameter alignment and compliance certifications. Both devices maintain identical voltage supply ranges, operating temperature specifications, and RoHS3 compliance status.

Key considerations for selection:

Electrical Compatibility: Both parts operate within 2.7V ~ 3.6V supply range and -40°C ~ 85°C temperature range, ensuring direct electrical substitution in existing circuit designs.
Memory Capacity: Identical 64Mbit capacity maintains data storage requirements without modification.
Interface Protocol: SPI interface compatibility is maintained. The W25Q64JVZPIQ supports Quad I/O mode as an enhancement, which is backward compatible with standard SPI operation.
Package Footprint: The AT25DF641A-MH-Y uses 8-UDFN (5x6) packaging while the W25Q64JVZPIQ uses 8-WSON (6x5) packaging. PCB layout modification is required due to different physical dimensions and pin arrangement.
Moisture Sensitivity: The substitute part has MSL rating 3 (168 hours) compared to MSL rating 1 (unlimited) for the original part. Storage and handling procedures must account for this difference.
Product Status: The W25Q64JVZPIQ maintains active product status with verified programmability, ensuring continued availability and support.

Frequently Asked Questions (FAQ)

Q: Can the W25Q64JVZPIQ directly replace the AT25DF641A-MH-Y without PCB modifications?

A: No. While electrical parameters are compatible, the package footprints differ. The AT25DF641A-MH-Y uses 8-UDFN (5x6) and the W25Q64JVZPIQ uses 8-WSON (6x5). PCB layout redesign is required for physical mounting.

Q: Are the SPI interface protocols fully compatible between these parts?

A: Yes. The W25Q64JVZPIQ supports SPI and Quad I/O modes. Standard SPI operation is fully backward compatible with the AT25DF641A-MH-Y SPI interface. Existing firmware requires no modification for basic SPI communication.

Q: What is the impact of different MSL ratings on component handling?

A: The AT25DF641A-MH-Y has MSL 1 (unlimited shelf life), while the W25Q64JVZPIQ has MSL 3 (168-hour limit after moisture exposure). The substitute requires stricter moisture control during storage and handling. Baking procedures may be necessary before reflow soldering if the 168-hour window is exceeded.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the AT25DF641A-MH-Y and W25Q64JVZPIQ are ROHS3 compliant and REACH unaffected, maintaining identical regulatory compliance status.

Q: Is the higher clock frequency of the W25Q64JVZPIQ (133 MHz vs 100 MHz) a concern?

A: No. Higher clock frequency represents a performance enhancement. Existing designs operating at 100 MHz will function correctly with the substitute part. The substitute supports faster operation if system requirements change.

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