AT26DF161A-MU Equivalent & Substitute Parts

Part Overview

The AT26DF161A-MU is a 16Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-VDFN (6x5) with exposed pad. This non-volatile memory device operates at 70 MHz and is designed for embedded storage applications requiring SPI interface connectivity. The product is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Type	Non-Volatile FLASH
Memory Interface	SPI
Clock Frequency	70 MHz
Supply Voltage Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VDFN Exposed Pad (6x5)
Write Cycle Time (Page)	5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT26DF161A-MU is determined by the following critical parameters:

Memory Capacity: 16Mbit (2M x 8 organization)
Memory Interface: SPI protocol compatibility
Supply Voltage: 2.7V ~ 3.6V operating range
Operating Temperature: -40°C ~ 85°C
Package Compatibility: 8-pin surface mount with exposed pad, 6x5mm footprint
Compliance: ROHS3 and REACH compliance status

The W25Q16JVZPIQ meets all substitution criteria. While it supports extended SPI-Quad I/O functionality and operates at higher clock frequency (133 MHz), it maintains full backward compatibility with standard SPI operation, identical voltage specifications, matching temperature range, and equivalent package footprint.

Parameter Comparison

Parameter	AT26DF161A-MU	W25Q16JVZPIQ	Match Status
Memory Size	16Mbit	16Mbit	Identical
Memory Type	Non-Volatile FLASH	Non-Volatile FLASH - NOR	Compatible
Memory Interface	SPI	SPI - Quad I/O	Compatible
Clock Frequency	70 MHz	133 MHz	Substitute Exceeds
Supply Voltage	2.7V ~ 3.6V	2.7V ~ 3.6V	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package Type	8-VDFN Exposed Pad (6x5)	8-WSON Exposed Pad (6x5)	Pin-Compatible
Page Write Time	5ms	3ms	Substitute Exceeds
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

The W25Q16JVZPIQ is a direct functional substitute for the obsolete AT26DF161A-MU. Selection is based on the following engineering criteria:

Compliance & Certification: Both devices maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for current manufacturing standards.

Electrical Compatibility: Identical supply voltage range (2.7V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) ensure drop-in compatibility in existing circuit designs without modification to power distribution or thermal management.

Memory Capacity & Organization: Both devices provide 16Mbit capacity with compatible memory organization, ensuring software and firmware compatibility without address space modifications.

Interface Protocol: The W25Q16JVZPIQ supports standard SPI operation in addition to Quad I/O modes. Existing designs using standard SPI protocol will operate without firmware changes. The higher clock frequency (133 MHz vs. 70 MHz) and faster page write time (3ms vs. 5ms) provide performance improvement without compatibility risk.

Package Footprint: Both devices use 8-pin surface mount packages with 6x5mm footprint and exposed pad, enabling direct PCB layout reuse.

Frequently Asked Questions (FAQ)

Q: Can the W25Q16JVZPIQ replace the AT26DF161A-MU in existing designs without PCB modification?

A: Yes. Both devices share identical pin counts, footprint dimensions (6x5mm), and exposed pad configuration. PCB layout and component placement require no changes.

Q: Are there firmware or software changes required when substituting to the W25Q16JVZPIQ?

A: No firmware changes are required for standard SPI operation. The W25Q16JVZPIQ operates in standard SPI mode by default, maintaining full compatibility with existing software. Quad I/O functionality is optional and requires explicit firmware implementation.

Q: What is the difference between 8-VDFN and 8-WSON packaging?

A: Both are 8-pin surface mount packages with identical footprint dimensions (6x5mm) and exposed pad. VDFN (Very Thin Dual Flat No-Lead) and WSON (Wafer-Level Chip Scale Package) are functionally equivalent for PCB assembly and electrical performance.

Q: Does the higher clock frequency of the W25Q16JVZPIQ affect compatibility?

A: No. Higher clock frequency is a performance enhancement that does not affect compatibility. Existing designs operating at 70 MHz will function correctly with the W25Q16JVZPIQ, which supports operation at lower frequencies.

Q: Are both devices RoHS compliant?

A: Yes. Both the AT26DF161A-MU and W25Q16JVZPIQ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

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

A: The W25Q16JVZPIQ is an active product with 18,488 units in stock, providing reliable availability for production and development requirements.

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