AT25SF321-SHD-T Equivalent & Substitute Parts

Part Overview

The AT25SF321-SHD-T is a 32Mbit NOR Flash memory IC with SPI Quad I/O interface manufactured by Renesas Electronics Corporation. This device is packaged in 8-SOIC and operates across a supply voltage range of 2.5V to 3.6V with a maximum clock frequency of 104 MHz. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Organization	4M x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF321-SHD-T is determined by the following mandatory parameters:

Memory capacity: 32Mbit
Memory organization: 4M x 8
Interface protocol: SPI - Quad I/O
Package type: 8-SOIC with matching physical dimensions
Supply voltage compatibility: Minimum 2.5V support required
Operating temperature range: -40°C to 85°C minimum
RoHS3 compliance

The three substitute parts listed below meet these core electrical and mechanical requirements. Variations in clock frequency, write cycle time, and voltage supply upper limits do not disqualify substitution when the minimum operating parameters are satisfied.

Parameter Comparison

Parameter	AT25SF321-SHD-T	AT25SF321B-SHB-T	AT25FF321A-SHN-T	W25Q32JVSSIQ
Manufacturer	Renesas Electronics	Renesas Electronics	Renesas Electronics	Winbond Electronics
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit
Memory Organization	4M x 8	4M x 8	4M x 8	4M x 8
Memory 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 Range	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 / Case	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance and meet the core electrical and mechanical specifications of the AT25SF321-SHD-T.

AT25SF321B-SHB-T is a direct Renesas successor with identical memory capacity and interface. This part operates at 108 MHz clock frequency and maintains the same temperature range. The supply voltage minimum increases to 2.7V. This part is verified as programmable and available in high volume.

AT25FF321A-SHN-T is a manufacturer-recommended alternative from Renesas with extended low-voltage operation down to 1.65V. Clock frequency matches the original part at 104 MHz. This part is available in lower volume and programmability has not been verified.

W25Q32JVSSIQ is a manufacturer-recommended alternative from Winbond Electronics with the highest clock frequency at 133 MHz. Supply voltage range is 2.7V to 3.6V. This part is verified as programmable and available in the highest volume. Moisture sensitivity level is rated at MSL 3 (168 Hours) compared to MSL 1 for Renesas alternatives.

Frequently Asked Questions (FAQ)

Q: Can AT25SF321B-SHB-T directly replace AT25SF321-SHD-T in existing designs?

A: Yes. Both parts share identical memory capacity, organization, interface protocol, package type, and operating temperature range. The supply voltage minimum of 2.7V for AT25SF321B-SHB-T is compatible with designs operating at or above this threshold. Clock frequency increase to 108 MHz provides additional performance margin.

Q: What is the key difference between AT25FF321A-SHN-T and the other Renesas option?

A: AT25FF321A-SHN-T supports lower supply voltages down to 1.65V, making it suitable for ultra-low-power applications. All other electrical and mechanical parameters remain compatible with the original part.

Q: Why does W25Q32JVSSIQ have a different moisture sensitivity level?

A: W25Q32JVSSIQ is rated MSL 3 (168 Hours) while Renesas parts are MSL 1 (Unlimited). This affects storage and handling requirements but does not impact electrical performance or substitution eligibility when proper moisture control procedures are followed.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use 8-SOIC packaging with identical physical dimensions (0.209", 5.30mm Width). AT25SF321B-SHB-T and AT25FF321A-SHN-T are supplied in Tape & Reel format, while W25Q32JVSSIQ is supplied in Tube format.

Q: Which substitute part offers the best performance?

A: W25Q32JVSSIQ operates at the highest clock frequency of 133 MHz. For applications requiring maximum speed within the 32Mbit SPI Quad I/O category, this part provides the greatest performance headroom.

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