AT25DQ321-S3H-T Equivalent & Substitute Parts

Part Overview

The AT25DQ321-S3H-T is a 32Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, designed for SPI interface applications operating at 100 MHz. This component features an 8-SOIC surface mount package and operates across a supply voltage range of 2.7V to 3.6V with an operating temperature range of -40°C to 85°C.

The AT25DQ321-S3H-T is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	100 MHz
Memory Organization	256 Bytes x 16384 pages
Write Cycle Time - Word	7µs
Write Cycle Time - Page	3ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AT25DQ321-S3H-T are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Memory Size: 32Mbit
Memory Format: FLASH
Memory Interface: SPI
Voltage Supply Range: 2.7V ~ 3.6V
Operating Temperature Range: -40°C ~ 85°C
Mounting Type: Surface Mount

Substitute Parts Identified:

AT25DF321A-SH-T (Renesas Electronics Corporation) - Manufacturer recommended substitute. Maintains identical memory specifications, voltage range, temperature range, and 8-SOIC package configuration. Classified as discontinued at DiGi Electronics with verified programmability.
W25Q32JVSFIQ (Winbond Electronics) - Functionally equivalent 32Mbit FLASH memory with SPI interface. Operates within the same voltage supply range (2.7V ~ 3.6V) and temperature range (-40°C ~ 85°C). Classified as active product status. Note: Package differs to 16-SOIC and clock frequency increases to 133 MHz with quad I/O capability.

Parameter Comparison

Parameter	AT25DQ321-S3H-T	AT25DF321A-SH-T	W25Q32JVSFIQ
Manufacturer	Renesas Electronics	Renesas Electronics	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 Range	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-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	16-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete	Discontinued at DiGi Electronics	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

AT25DF321A-SH-T is the primary substitute for AT25DQ321-S3H-T. Both parts are manufactured by Renesas Electronics Corporation and maintain identical electrical and mechanical specifications. The AT25DF321A-SH-T offers ROHS3 compliance and verified programmability, making it suitable for direct replacement in existing designs. The 8-SOIC package footprint remains unchanged, eliminating PCB redesign requirements.

W25Q32JVSFIQ serves as an alternative substitute when package size constraints permit. This Winbond part maintains core memory specifications and voltage/temperature operating ranges. The W25Q32JVSFIQ is classified as active product status, ensuring ongoing availability. Design considerations include the larger 16-SOIC package footprint and enhanced clock frequency capability (133 MHz versus 100 MHz). The quad I/O interface provides additional functionality beyond the standard SPI interface of the original part. MSL rating of 3 requires adherence to 168-hour moisture exposure limits during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can AT25DF321A-SH-T be used as a direct replacement for AT25DQ321-S3H-T?

A: Yes. Both parts share identical memory capacity (32Mbit), interface type (SPI), voltage supply range (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and package configuration (8-SOIC). No circuit modifications or PCB redesign are required.

Q: What are the key differences between AT25DF321A-SH-T and W25Q32JVSFIQ?

A: The primary differences are manufacturer (Renesas versus Winbond), package size (8-SOIC versus 16-SOIC), clock frequency (100 MHz versus 133 MHz), and interface capability (standard SPI versus SPI with Quad I/O). Both maintain the same 32Mbit capacity and voltage/temperature specifications. PCB layout modifications are necessary if selecting W25Q32JVSFIQ due to package size change.

Q: Are there any compliance or certification differences between these parts?

A: AT25DF321A-SH-T and W25Q32JVSFIQ both carry ROHS3 compliance and REACH unaffected status. The original AT25DQ321-S3H-T compliance status is not specified in available documentation. MSL ratings differ: AT25DQ321-S3H-T and AT25DF321A-SH-T are rated MSL 1 (unlimited), while W25Q32JVSFIQ is rated MSL 3 (168 hours).

Q: What is the impact of the W25Q32JVSFIQ's higher clock frequency?

A: The W25Q32JVSFIQ operates at 133 MHz compared to 100 MHz for the original part. This higher frequency is backward compatible with designs operating at lower clock speeds. Firmware or driver modifications may be required to utilize the enhanced frequency capability or quad I/O interface features.

Q: Does package size difference affect design feasibility?

A: The AT25DF321A-SH-T maintains the 8-SOIC package of the original part, requiring no PCB modifications. The W25Q32JVSFIQ uses a 16-SOIC package (0.295" width versus 0.209" width), necessitating PCB layout changes and footprint redesign. Verify available PCB space before selecting W25Q32JVSFIQ.

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