AT25DF321A-MH-T Equivalent & Substitute Parts

Part Overview

The AT25DF321A-MH-T is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-UDFN (5x6) surface mount package. This non-volatile memory device operates at 100 MHz and is designed for applications requiring high-density data storage with SPI interface compatibility. The part carries a "Not For New Designs" status, making identification of functionally equivalent alternatives essential for ongoing production and design updates.

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 (Page)	3ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AT25DF321A-MH-T are identified based on the following critical parameters that determine functional equivalence:

Memory Capacity: 32Mbit (exact match required)
Memory Type: Non-Volatile FLASH technology
Interface Protocol: SPI or SPI-compatible (including Quad I/O variants)
Voltage Supply Range: 2.7V ~ 3.6V (compatible operating window)
Operating Temperature Range: -40°C ~ 85°C
Package Compatibility: 8-pin surface mount packages with exposed pad
RoHS Compliance: ROHS3 Compliant

The identified substitutes maintain these core electrical and mechanical parameters while potentially offering variations in clock frequency, packaging format, or interface capabilities that remain within acceptable operational boundaries.

Parameter Comparison

Parameter	AT25DF321A-MH-T (Main)	AT25DF321A-MH-Y (Substitute)	W25Q32JVZPIQ (Substitute)
Manufacturer	Renesas Electronics	Adesto Technologies	Winbond Electronics
Memory Size	32Mbit	32Mbit	32Mbit
Memory Format	FLASH	FLASH	FLASH - NOR
Memory Interface	SPI	SPI	SPI - Quad I/O
Clock Frequency	100 MHz	100 MHz	133 MHz
Memory Organization	256 Bytes x 16384 pages	256 Bytes x 16384 pages	4M x 8
Write Cycle Time (Page)	3ms	3ms	3ms
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)
Package / Case	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-WDFN Exposed Pad
Supplier Package	8-UDFN (5x6)	8-UDFN (5x6)	8-WSON (6x5)
Product Status	Not For New Designs	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

AT25DF321A-MH-Y provides direct functional equivalence to the AT25DF321A-MH-T with identical electrical specifications, memory organization, and package dimensions. Both parts share "Not For New Designs" status from their respective manufacturers. Selection of this substitute is appropriate for applications requiring pin-for-pin compatibility and identical performance characteristics. Packaging format differs (Tray vs. Cut Tape), which may affect procurement and handling procedures.

W25Q32JVZPIQ offers functional substitution with enhanced capabilities. This Winbond device maintains the 32Mbit capacity, 2.7V ~ 3.6V supply range, and -40°C ~ 85°C operating temperature. The W25Q32JVZPIQ operates at 133 MHz (33 MHz faster than the main part) and supports Quad I/O interface in addition to standard SPI mode, providing backward compatibility with SPI-only applications. The part carries "Active" product status, ensuring long-term availability. Package dimensions differ slightly (8-WSON 6x5 vs. 8-UDFN 5x6), requiring PCB layout verification. MSL rating is 3 (168 Hours) compared to MSL 1, affecting moisture handling during assembly.

Frequently Asked Questions (FAQ)

Q: Can AT25DF321A-MH-Y be used as a direct replacement for AT25DF321A-MH-T?

A: Yes. Both parts are electrically and mechanically equivalent with identical memory capacity (32Mbit), interface (SPI), clock frequency (100 MHz), voltage range (2.7V ~ 3.6V), operating temperature (-40°C ~ 85°C), and package type (8-UDFN Exposed Pad 5x6). The primary difference is packaging format (Tray vs. Cut Tape).

Q: What are the key differences between W25Q32JVZPIQ and AT25DF321A-MH-T?

A: The W25Q32JVZPIQ maintains core electrical compatibility (32Mbit, 2.7V ~ 3.6V, -40°C ~ 85°C) but operates at 133 MHz versus 100 MHz and supports Quad I/O interface capability. Package dimensions differ (8-WSON 6x5 vs. 8-UDFN 5x6), and MSL rating is higher (3 vs. 1). The W25Q32JVZPIQ carries Active product status.

Q: Are there pin compatibility concerns with W25Q32JVZPIQ substitution?

A: Both the 8-UDFN and 8-WSON packages are 8-pin configurations with exposed pads. Physical dimensions differ (5x6mm vs. 6x5mm), requiring PCB footprint verification. Pin assignments must be confirmed against device datasheets before layout implementation.

Q: What is the impact of MSL rating differences?

A: AT25DF321A-MH-T and AT25DF321A-MH-Y have MSL 1 (Unlimited moisture sensitivity level), while W25Q32JVZPIQ has MSL 3 (168 Hours). MSL 3 requires moisture control during storage and assembly, with baking procedures if exposure limits are exceeded. MSL 1 parts have no moisture sensitivity restrictions.

Q: Why is AT25DF321A-MH-T marked "Not For New Designs"?

A: This status indicates the manufacturer is discontinuing the product line. Existing designs may continue using available inventory, but new designs should transition to active alternatives such as W25Q32JVZPIQ to ensure long-term supply availability.

Q: Can W25Q32JVZPIQ operate in standard SPI mode?

A: Yes. The W25Q32JVZPIQ supports both standard SPI and Quad I/O modes. Applications using only SPI protocol will operate without modification, though Quad I/O capability remains unused.

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