AT25DQ321-MH-T Equivalent & Substitute Parts

Part Overview

The AT25DQ321-MH-T is a 32Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-UDFN (5x6) package. This component operates at 100 MHz with a supply voltage range of 2.7V to 3.6V and supports industrial temperature ranges from -40°C to 85°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Type	Non-Volatile FLASH
Memory Interface	SPI
Clock Frequency	100 MHz
Memory Organization	256 Bytes x 16384 pages
Write Cycle Time (Word/Page)	7µs / 3ms
Supply Voltage	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DQ321-MH-T is determined by the following critical parameters:

Memory Capacity: 32Mbit (exact match required)
Memory Type & Technology: Non-Volatile FLASH
Memory Interface: SPI protocol compatibility
Supply Voltage Range: 2.7V ~ 3.6V (must encompass or match)
Operating Temperature Range: -40°C ~ 85°C (must encompass or match)
Package Type: 8-pin surface mount with exposed pad configuration
Write Performance: Page write cycle time of 3ms or faster

The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications designed for the AT25DQ321-MH-T.

Parameter Comparison

Parameter	AT25DQ321-MH-T	AT25DF321A-MH-T	AT25DF321A-MH-Y	W25Q32JVZPIQ
Manufacturer	Renesas Electronics	Renesas Electronics	Adesto Technologies	Winbond Electronics
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH - NOR
Memory Interface	SPI	SPI	SPI	SPI - Quad I/O
Clock Frequency	100 MHz	100 MHz	100 MHz	133 MHz
Memory Organization	256 Bytes x 16384 pages	256 Bytes x 16384 pages	256 Bytes x 16384 pages	4M x 8
Write Cycle Time (Page)	3ms	3ms	3ms	3ms
Supply Voltage	2.7V ~ 3.6V	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	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-WSON Exposed Pad
Product Status	Obsolete	Not For New Designs	Not For New Designs	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

AT25DF321A-MH-T (Renesas Electronics): This part maintains identical electrical specifications and memory organization to the AT25DQ321-MH-T while offering improved moisture sensitivity characteristics (MSL 1 vs. MSL 3). It is ROHS3 compliant and REACH unaffected. Although classified as "Not For New Designs," it provides the closest functional equivalence with the same 8-UDFN package footprint.

AT25DF321A-MH-Y (Adesto Technologies): Functionally equivalent to the AT25DF321A-MH-T with identical electrical and memory parameters. This variant is supplied in Tray packaging and offers the same MSL 1 rating and ROHS3 compliance. Packaging format differs from the original part.

W25Q32JVZPIQ (Winbond Electronics): This part meets all core electrical requirements with 32Mbit capacity, SPI interface, matching supply voltage, and operating temperature range. It operates at 133 MHz (exceeding the 100 MHz specification) and features Quad I/O capability for enhanced performance. The package type differs (8-WSON vs. 8-UDFN), requiring PCB layout verification. This is the only substitute with Active product status, making it suitable for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can AT25DF321A-MH-T directly replace AT25DQ321-MH-T?

A: Yes. Both parts share identical memory capacity (32Mbit), interface protocol (SPI), clock frequency (100 MHz), supply voltage (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and package configuration (8-UDFN Exposed Pad). The AT25DF321A-MH-T offers improved moisture sensitivity handling.

Q: What is the difference between AT25DF321A-MH-T and AT25DF321A-MH-Y?

A: Both parts are electrically and functionally identical. The primary difference is packaging format: AT25DF321A-MH-T is supplied in Cut Tape (CT) & Digi-Reel format, while AT25DF321A-MH-Y is supplied in Tray format. Selection depends on procurement and assembly requirements.

Q: Can W25Q32JVZPIQ be used as a substitute?

A: W25Q32JVZPIQ meets all critical electrical specifications and memory capacity requirements. However, the package type differs (8-WSON vs. 8-UDFN), requiring PCB footprint and layout verification before implementation. The part's Quad I/O capability and higher clock frequency (133 MHz) provide performance headroom. W25Q32JVZPIQ is the only substitute with Active product status.

Q: What does "Not For New Designs" status mean?

A: This designation indicates the manufacturer no longer recommends these parts for new product development. Existing designs may continue using these parts, but new applications should transition to active alternatives. W25Q32JVZPIQ carries Active status and is recommended for new designs.

Q: Are all substitutes ROHS3 compliant?

A: AT25DF321A-MH-T, AT25DF321A-MH-Y, and W25Q32JVZPIQ are all ROHS3 compliant. The original AT25DQ321-MH-T RoHS status is not specified in available documentation.

Q: How do moisture sensitivity levels affect component handling?

A: MSL 1 (AT25DF321A variants) indicates unlimited shelf life without moisture absorption concerns. MSL 3 (AT25DQ321-MH-T and W25Q32JVZPIQ) requires controlled storage conditions with a 168-hour floor life after moisture exposure. AT25DF321A variants offer superior moisture tolerance for extended storage scenarios.

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