AT25SF321-MHD-T Equivalent & Substitute Parts

Part Overview

The AT25SF321-MHD-T is a 32Mbit NOR Flash memory IC manufactured by Renesas Electronics Corporation, featuring SPI Quad I/O interface with 104 MHz clock frequency in 8-UDFN (5x6) surface mount packaging. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Format	FLASH - NOR
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Memory Organization	4M x 8
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF321-MHD-T is determined by the following critical parameters:

Memory capacity: 32Mbit (4M x 8 organization)
Interface protocol: SPI Quad I/O
Package footprint: 8-pin UDFN/WSON with exposed pad
Supply voltage compatibility: Minimum 2.5V operation required
Temperature range: -40°C to 85°C
RoHS3 compliance

Substitute parts must maintain identical memory capacity, interface type, and temperature operating range. Package variants (UDFN vs. WSON) are acceptable provided pin configuration and footprint compatibility are verified for the target application. Clock frequency variations above the minimum 104 MHz specification do not preclude substitution. Supply voltage ranges that encompass the original specification are acceptable.

Parameter Comparison

Parameter	AT25SF321-MHD-T	AT25SF321B-MHB-T	AT25FF321A-MHN-T	W25Q32JVZPIQ
Manufacturer	Renesas	Renesas	Renesas	Winbond
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit
Memory Format	FLASH - NOR	FLASH - NOR	FLASH - NOR	FLASH - NOR
Interface	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O
Clock Frequency	104 MHz	108 MHz	104 MHz	133 MHz
Voltage Supply	2.5V ~ 3.6V	2.7V ~ 3.6V	1.65V ~ 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	8-UDFN (5x6)	8-UDFN (5x6)	8-UDFN (5x6)	8-WSON (6x5)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT25SF321B-MHB-T is the direct Renesas equivalent with active product status. This part maintains identical package geometry (8-UDFN 5x6), memory capacity, and interface specification. The increased clock frequency (108 MHz vs. 104 MHz) and reduced page write cycle time (3ms vs. 5ms) provide performance enhancement without functional incompatibility. The minimum supply voltage increases to 2.7V; applications requiring 2.5V operation must account for this specification change.

AT25FF321A-MHN-T is the manufacturer-recommended alternative from Renesas with active status. This part maintains the original 104 MHz clock frequency and identical package footprint. The extended supply voltage range (1.65V ~ 3.6V) provides greater operational flexibility for low-power applications. Write cycle time specifications are not provided for this variant.

W25Q32JVZPIQ is a cross-manufacturer substitute from Winbond with active product status. This part delivers the highest clock frequency (133 MHz) and maintains 32Mbit capacity with SPI Quad I/O interface. The package variant (8-WSON 6x5) differs from the original UDFN footprint; PCB layout and mechanical compatibility must be evaluated. Moisture sensitivity level increases to MSL 3 (168 hours). Supply voltage minimum increases to 2.7V.

All substitute parts maintain ROHS3 compliance and identical operating temperature range (-40°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can AT25SF321B-MHB-T directly replace AT25SF321-MHD-T in existing designs?

A: AT25SF321B-MHB-T is functionally compatible for applications operating at 2.7V or higher. The minimum supply voltage specification increases from 2.5V to 2.7V. If the original design operates at 2.5V, voltage compatibility must be verified before substitution.

Q: What is the primary difference between AT25SF321B-MHB-T and AT25FF321A-MHN-T?

A: Both are Renesas 32Mbit SPI Quad I/O alternatives. AT25SF321B-MHB-T operates at 108 MHz with 2.7V minimum supply. AT25FF321A-MHN-T operates at 104 MHz with extended 1.65V minimum supply voltage, suitable for low-power applications.

Q: Is W25Q32JVZPIQ a pin-compatible replacement?

A: W25Q32JVZPIQ maintains identical pin count (8-pin) and SPI Quad I/O interface. The package footprint differs (WSON 6x5 vs. UDFN 5x6); PCB layout modifications may be required. Electrical interface compatibility is maintained.

Q: What are the supply voltage constraints for substitution?

A: The original AT25SF321-MHD-T operates at 2.5V ~ 3.6V. AT25SF321B-MHB-T and W25Q32JVZPIQ require minimum 2.7V. AT25FF321A-MHN-T supports 1.65V minimum, providing the widest voltage compatibility range.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts (AT25SF321B-MHB-T, AT25FF321A-MHN-T, W25Q32JVZPIQ) maintain ROHS3 compliance status.

Q: What is the impact of increased clock frequency in substitute parts?

A: Higher clock frequencies (108 MHz for AT25SF321B-MHB-T, 133 MHz for W25Q32JVZPIQ) do not reduce compatibility with designs specified for 104 MHz operation. Increased frequency capability provides performance headroom without functional degradation.

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