AT25DF161-MH-T Equivalent & Substitute Parts

Part Overview

The AT25DF161-MH-T is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Microchip Technology, packaged in an 8-UDFN (5x6) form factor 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-T 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 Type	Non-Volatile FLASH
Memory Size	16Mbit
Memory Organization	2M x 8
Memory Interface	SPI
Clock Frequency	100 MHz
Supply Voltage	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (5x6)
Write Cycle Time (Page)	3ms
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AT25DF161-MH-T is determined by strict alignment of the following electrical and mechanical parameters:

Memory Capacity: 16Mbit (2M x 8 organization) is the primary functional requirement
Interface Protocol: SPI compatibility is mandatory for system integration
Supply Voltage Range: 2.7V ~ 3.6V operating range must be maintained
Operating Temperature Range: -40°C ~ 85°C specification must be met or exceeded
Package Compatibility: Physical form factor and pin configuration must support board-level integration
Compliance Standards: RoHS3 and REACH compliance status must be equivalent or superior

The W25Q16JVZPIQ meets these substitution criteria through equivalent memory capacity, compatible SPI interface, matching voltage specifications, and compliant regulatory status. Package differences (8-WSON vs. 8-UDFN) require mechanical validation but do not preclude functional substitution.

Parameter Comparison

Parameter	AT25DF161-MH-T	W25Q16JVZPIQ	Compatibility
Memory Size	16Mbit	16Mbit	Equivalent
Memory Organization	2M x 8	2M x 8	Equivalent
Memory Interface	SPI	SPI - Quad I/O	Compatible (Quad I/O is SPI superset)
Clock Frequency	100 MHz	133 MHz	Compatible (higher frequency)
Supply Voltage	2.7V ~ 3.6V	2.7V ~ 3.6V	Equivalent
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	Equivalent
Page Write Cycle Time	3ms	3ms	Equivalent
Package Type	8-UDFN (5x6)	8-WSON (6x5)	Different form factor
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	3 (168 Hours)	3 (168 Hours)	Equivalent
Product Status	Obsolete	Active	Substitute is actively manufactured

Engineering Selection Recommendations

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

Electrical Compatibility: Both devices operate within identical supply voltage ranges (2.7V ~ 3.6V) and temperature specifications (-40°C ~ 85°C). The W25Q16JVZPIQ's higher clock frequency (133 MHz vs. 100 MHz) and Quad I/O capability provide enhanced performance while maintaining backward compatibility with standard SPI operation.

Memory Specification Alignment: Both parts provide 16Mbit capacity in 2M x 8 organization with equivalent page write cycle times (3ms), ensuring functional parity for data storage and retrieval operations.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements. Moisture sensitivity levels are identical (MSL 3, 168 Hours).

Supply Chain Status: The W25Q16JVZPIQ is actively manufactured by Winbond Electronics, providing long-term availability and supply continuity compared to the obsolete AT25DF161-MH-T.

Package Consideration: The W25Q16JVZPIQ uses an 8-WSON (6x5) package versus the original 8-UDFN (5x6) package. While pin configurations are compatible, PCB layout modifications may be required to accommodate the different form factor and pad dimensions.

Frequently Asked Questions (FAQ)

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

A: Yes, for standard SPI operation. The W25Q16JVZPIQ supports full SPI compatibility with the AT25DF161-MH-T command set. The additional Quad I/O capability is optional and does not interfere with standard SPI mode operation. Firmware modifications are not required for basic functionality.

Q: What are the package differences between these two parts?

A: The AT25DF161-MH-T uses an 8-UDFN (5x6mm) package, while the W25Q16JVZPIQ uses an 8-WSON (6x5mm) package. Both are surface-mount packages with 8 pins and exposed pads. PCB footprint redesign is necessary, but pin pitch and electrical connections remain compatible.

Q: Are there any performance differences I should consider?

A: The W25Q16JVZPIQ operates at 133 MHz compared to the AT25DF161-MH-T's 100 MHz, providing faster read performance. Page write cycle times are identical at 3ms. The higher frequency capability does not negatively impact the substitute's compatibility with systems designed for the original part.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the AT25DF161-MH-T and W25Q16JVZPIQ are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings (3, 168 Hours). Regulatory and environmental requirements are equivalent.

Q: What is the significance of the W25Q16JVZPIQ's Quad I/O capability?

A: Quad I/O allows simultaneous data transfer on four lines instead of one, enabling faster read operations when supported by the host controller. For systems using standard SPI mode, this feature remains inactive and does not affect operation. It provides a performance upgrade path without requiring part replacement.

Q: Is the W25Q16JVZPIQ suitable for new designs?

A: Yes. The W25Q16JVZPIQ is actively manufactured and recommended for new designs requiring 16Mbit SPI FLASH memory. Its active product status ensures long-term availability and supply chain stability compared to obsolete alternatives.

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