AT26DF321-SU Equivalent & Substitute Parts

Part Overview

The AT26DF321-SU is a 32Mbit SPI FLASH memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring SPI interface communication. This component operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is housed in an 8-SOIC surface mount package.

The AT26DF321-SU has reached obsolete product status. Identifying functionally compatible substitute parts is necessary to maintain design continuity and ensure continued availability for production and replacement applications.

Substiute Parts

AT26DF321-SU

Microchip TechnologyIn Stock: 16329AT26DF321-SU Datasheet

Current PartRFQ

W25Q32JVSSIQ

Winbond ElectronicsIn Stock: 194474W25Q32JVSSIQ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT26DF321-SU are identified based on the following critical parameters that determine functional compatibility:

Memory Capacity: 32Mbit capacity is the primary selection criterion. Substitute parts must provide identical storage capacity to maintain firmware and data compatibility.

Memory Interface: SPI interface compatibility is mandatory. The AT26DF321-SU uses standard SPI protocol; substitute parts must support SPI communication at minimum.

Package and Pinout: 8-SOIC package with 0.209" width and 5.30mm physical dimensions ensures mechanical and electrical compatibility with existing PCB layouts and sockets.

Voltage Supply Range: 2.7V to 3.6V operating range must be maintained or exceeded to ensure compatibility with existing power supply designs.

Operating Temperature Range: -40°C to 85°C specification must be met or exceeded to maintain reliability across the same environmental conditions.

RoHS Compliance: ROHS3 compliance status ensures regulatory alignment for current manufacturing standards.

Parameter Comparison

Engineering Selection Recommendations

The W25Q32JVSSIQ qualifies as a direct substitute for the AT26DF321-SU based on matching memory capacity, package dimensions, voltage supply range, and operating temperature specifications. Both components are ROHS3 compliant and maintain identical physical form factors.

The W25Q32JVSSIQ offers enhanced performance characteristics, including doubled clock frequency (133 MHz versus 66 MHz) and faster page write cycle time (3ms versus 5ms). The substitute part supports Quad I/O mode in addition to standard SPI operation, providing backward compatibility with existing SPI-only designs while enabling higher-speed operation when supported by the host controller.

The W25Q32JVSSIQ maintains active product status with verified availability, addressing the obsolescence of the original AT26DF321-SU component.

Frequently Asked Questions (FAQ)

Q: Can the W25Q32JVSSIQ be used as a direct replacement for the AT26DF321-SU?

A: Yes. Both components share identical memory capacity (32Mbit), package type (8-SOIC), voltage supply range (2.7V ~ 3.6V), and operating temperature range (-40°C ~ 85°C). The W25Q32JVSSIQ supports standard SPI protocol, ensuring compatibility with existing firmware and hardware designs.

Q: What are the key differences between these parts?

A: The W25Q32JVSSIQ operates at 133 MHz compared to the AT26DF321-SU's 66 MHz, and features faster page write cycles (3ms versus 5ms). The substitute part supports Quad I/O mode for enhanced data throughput, though standard SPI operation remains fully compatible with the original design.

Q: Are there any package or pinout differences?

A: No. Both components use identical 8-SOIC packaging with 0.209" width and 5.30mm dimensions. Pinout compatibility is maintained, allowing direct PCB socket replacement without layout modifications.

Q: What is the significance of the Quad I/O capability in the W25Q32JVSSIQ?

A: Quad I/O mode enables four-line data transfer, doubling throughput compared to standard SPI. This feature is optional and does not affect standard SPI operation. Existing designs using standard SPI protocol will function without modification.

Q: Are both parts RoHS compliant?

A: Yes. Both the AT26DF321-SU and W25Q32JVSSIQ are ROHS3 compliant, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the availability status of the substitute part?

A: The W25Q32JVSSIQ maintains active product status with verified availability from multiple suppliers, addressing the obsolescence of the AT26DF321-SU.