AT25DF161-MH-Y Equivalent & Substitute Parts

Part Overview

The AT25DF161-MH-Y is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Microchip Technology, packaged in an 8-UDFN (5x6) configuration with exposed pad. This non-volatile memory device operates at 100 MHz and is designed for embedded systems requiring high-density data storage with SPI interface compatibility.

The AT25DF161-MH-Y has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	100 MHz
Memory Organization	2M x 8
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AT25DF161-MH-Y is determined by strict alignment of the following critical parameters:

Memory Capacity: 16Mbit (2M x 8 organization)
Memory Technology: FLASH (Non-Volatile)
Interface Protocol: SPI-compatible communication
Supply Voltage: 2.7V ~ 3.6V operating range
Operating Temperature: -40°C ~ 85°C
Package Compatibility: Surface mount, 8-pin configuration with exposed pad
Compliance Standards: ROHS3 and REACH compliance

The W25Q16JVZPIQ qualifies as a direct substitute based on matching memory capacity, FLASH technology, SPI interface support, identical supply voltage range, and equivalent operating temperature specifications. Both devices maintain ROHS3 compliance and identical moisture sensitivity ratings.

Parameter Comparison

Parameter	AT25DF161-MH-Y	W25Q16JVZPIQ	Match Status
Manufacturer	Microchip Technology	Winbond Electronics	Different
Memory Size	16Mbit	16Mbit	Match
Memory Format	FLASH	FLASH - NOR	Match
Memory Interface	SPI	SPI - Quad I/O	Compatible
Memory Organization	2M x 8	2M x 8	Match
Clock Frequency	100 MHz	133 MHz	Compatible
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	Match
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	Match
Package Type	8-UDFN Exposed Pad (5x6)	8-WSON Exposed Pad (6x5)	Compatible
Mounting Type	Surface Mount	Surface Mount	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	Match
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The W25Q16JVZPIQ is a qualified substitute for the AT25DF161-MH-Y based on the following engineering criteria:

Functional Equivalence: Both devices provide 16Mbit FLASH memory with SPI interface, identical memory organization (2M x 8), and matching supply voltage specifications (2.7V ~ 3.6V). The W25Q16JVZPIQ supports extended Quad I/O mode, which provides backward compatibility with standard SPI operation required by the original design.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 3, 168 Hours), ensuring regulatory and environmental compatibility with existing manufacturing processes.

Supply Status: The AT25DF161-MH-Y is obsolete with limited availability. The W25Q16JVZPIQ maintains active product status with substantial inventory availability (18,488 units), ensuring long-term supply chain continuity.

Performance Characteristics: The W25Q16JVZPIQ operates at 133 MHz, exceeding the 100 MHz specification of the original part, providing performance headroom. Write cycle times are equivalent or improved (3ms page write time).

Package Consideration: The W25Q16JVZPIQ uses 8-WSON (6x5) packaging versus the original 8-UDFN (5x6). Both are 8-pin surface mount packages with exposed pads. PCB layout verification is required to confirm footprint compatibility, as dimensional differences exist between UDFN and WSON packages.

Frequently Asked Questions (FAQ)

Q: Can the W25Q16JVZPIQ directly replace the AT25DF161-MH-Y without firmware changes?

A: The W25Q16JVZPIQ maintains full SPI protocol compatibility with the AT25DF161-MH-Y. Standard SPI read and write operations are functionally identical. The extended Quad I/O capability of the W25Q16JVZPIQ is optional and does not interfere with standard SPI mode operation. No firmware modifications are required if the design uses only standard SPI commands.

Q: What are the package differences between 8-UDFN and 8-WSON?

A: Both packages are 8-pin surface mount configurations with exposed thermal pads. The 8-UDFN (5x6) measures 5.0mm x 6.0mm, while the 8-WSON (6x5) measures 6.0mm x 5.0mm. Pin pitch and pad layout differ. PCB footprint redesign and revalidation are necessary before production implementation.

Q: Are both parts RoHS compliant?

A: Yes. Both the AT25DF161-MH-Y and W25Q16JVZPIQ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the higher clock frequency in the W25Q16JVZPIQ?

A: The W25Q16JVZPIQ operates at 133 MHz versus 100 MHz for the AT25DF161-MH-Y. This higher frequency provides performance margin and does not create compatibility issues. Existing designs operating at 100 MHz will function correctly with the substitute part.

Q: How do the write cycle times compare?

A: The AT25DF161-MH-Y specifies 7µs word write time and 3ms page write time. The W25Q16JVZPIQ specifies 3ms page write time. Both devices meet equivalent or faster write performance requirements for typical SPI FLASH applications.

Q: Is the Quad I/O feature of the W25Q16JVZPIQ a concern for compatibility?

A: No. The Quad I/O mode is an optional extended feature. The W25Q16JVZPIQ operates in standard SPI mode by default and is fully backward compatible with designs that do not utilize Quad I/O commands. Existing firmware requires no modification.

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