AT26DF161-SU Equivalent & Substitute Parts

Part Overview

The AT26DF161-SU is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor. This device operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and supports a write cycle time of 5ms per page. The product is currently classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

AT26DF161-SU

Microchip TechnologyIn Stock: 16599AT26DF161-SU Datasheet

Current PartRFQ

W25Q16JVSSIQ

Winbond ElectronicsIn Stock: 205371W25Q16JVSSIQ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT26DF161-SU is determined by strict equivalence across the following critical parameters:

Memory Capacity & Organization: The substitute must provide 16Mbit total capacity in FLASH format to maintain data storage compatibility.

Interface Protocol: The substitute must support SPI interface to ensure signal-level compatibility with existing PCB designs and firmware implementations.

Package & Pinout: The substitute must use 8-SOIC packaging with identical 0.209" width (5.30mm) to maintain mechanical fit on the PCB.

Electrical Specifications: The substitute must operate within the 2.7V to 3.6V supply voltage range and support the -40°C to 85°C operating temperature window.

Compliance & Certification: The substitute must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory requirements.

The W25Q16JVSSIQ from Winbond Electronics meets all these substitution criteria while offering enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The W25Q16JVSSIQ is a direct functional substitute for the AT26DF161-SU based on matching memory capacity, interface protocol, package form factor, and electrical operating parameters. Both devices maintain identical supply voltage ranges (2.7V to 3.6V) and operating temperature specifications (-40°C to 85°C), ensuring compatibility with existing circuit designs.

The W25Q16JVSSIQ carries active product status from Winbond Electronics, providing long-term availability and supply chain stability compared to the obsolete AT26DF161-SU. Both parts maintain ROHS3 compliance and REACH unaffected certification, satisfying regulatory requirements for new designs and legacy system support.

The W25Q16JVSSIQ offers performance enhancements including 133 MHz clock frequency (versus 66 MHz) and 3ms page write cycle time (versus 5ms), providing improved throughput without requiring design modifications. The Quad I/O interface capability of the W25Q16JVSSIQ is backward compatible with standard SPI operation, allowing seamless integration into existing firmware implementations.

Frequently Asked Questions (FAQ)

Q: Can the W25Q16JVSSIQ directly replace the AT26DF161-SU without PCB modifications?

A: Yes. Both devices use identical 8-SOIC packaging with matching pinout and electrical specifications. No PCB layout changes are required for mechanical or electrical compatibility.

Q: Are the supply voltage requirements identical between these parts?

A: Yes. Both the AT26DF161-SU and W25Q16JVSSIQ operate within the 2.7V to 3.6V supply voltage range, ensuring compatibility with existing power delivery circuits.

Q: Does the higher clock frequency of the W25Q16JVSSIQ require firmware changes?

A: No. The W25Q16JVSSIQ operates at 133 MHz maximum, but firmware can configure it to operate at lower frequencies including the 66 MHz specification of the original part. Existing firmware will function without modification.

Q: What is the significance of the Quad I/O interface on the W25Q16JVSSIQ?

A: The Quad I/O capability allows four-bit parallel data transfer when enabled, improving data throughput. However, the device remains fully compatible with standard SPI single-bit operation, making this feature optional for legacy designs.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the AT26DF161-SU and W25Q16JVSSIQ maintain ROHS3 compliance and REACH unaffected status, satisfying current regulatory requirements for electronic components.

Q: Why is the W25Q16JVSSIQ recommended despite the AT26DF161-SU being available in inventory?

A: The AT26DF161-SU is classified as obsolete, indicating discontinued production and limited long-term availability. The W25Q16JVSSIQ carries active product status with substantial inventory (205,300 units), ensuring reliable supply for current and future applications.