AT26DF161A-SSU Equivalent & Substitute Parts

Part Overview

The AT26DF161A-SSU is a 16Mbit SPI FLASH memory IC manufactured by Microchip Technology, housed in an 8-SOIC package. This device operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the AT26DF161A-SSU 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 range
Package: 8-SOIC form factor
RoHS compliance: ROHS3 Compliant

The three identified substitute parts meet these core requirements. Variations in clock frequency (50 MHz vs. 70 MHz vs. 133 MHz), operating temperature ranges, and write cycle times represent performance differences that must be evaluated against specific application requirements. All substitutes maintain electrical compatibility within the specified voltage and interface parameters.

Parameter Comparison

Parameter	AT26DF161A-SSU	SST25VF016B-50-4C-S2AF	SST25VF016B-50-4I-S2AF	W25Q16JVSNIQ
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Winbond Electronics
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit
Memory Organization	256 Bytes x 8192 pages	2M x 8	2M x 8	2M x 8
Memory Interface	SPI	SPI	SPI	SPI - Quad I/O
Clock Frequency	70 MHz	50 MHz	50 MHz	133 MHz
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Write Cycle Time (Page)	5ms	10µs	10µs	3ms

Engineering Selection Recommendations

SST25VF016B-50-4I-S2AF is the primary substitute candidate. It maintains identical supply voltage range (2.7V ~ 3.6V), matches the full operating temperature range (-40°C ~ 85°C), and is actively manufactured by Microchip Technology with verified programmability. The 50 MHz clock frequency represents a performance reduction from the original 70 MHz specification. The 8-SOIC package dimension difference (5.30mm vs. 3.90mm width) requires PCB layout verification for physical fit.

W25Q16JVSNIQ offers the highest clock frequency (133 MHz) and maintains the original 8-SOIC package width (3.90mm). This Winbond device supports Quad I/O interface capability, providing enhanced performance potential. Operating temperature range matches the original specification (-40°C ~ 85°C). The 3ms page write cycle time is faster than the original 5ms specification.

SST25VF016B-50-4C-S2AF is suitable only for applications with operating temperature requirements limited to 0°C ~ 70°C. This variant shares all other characteristics with the SST25VF016B-50-4I-S2AF but with restricted thermal operating range.

All three substitutes maintain ROHS3 compliance and are currently in active production with substantial inventory availability.

Frequently Asked Questions (FAQ)

Q: Can SST25VF016B-50-4I-S2AF directly replace AT26DF161A-SSU without firmware changes?

A: The SST25VF016B-50-4I-S2AF maintains SPI interface compatibility and identical supply voltage range. However, the reduced clock frequency (50 MHz vs. 70 MHz) and different page write cycle time (10µs vs. 5ms) may affect system timing. Firmware verification is required to confirm compatibility with existing command sequences and timing assumptions.

Q: What is the significance of the 8-SOIC package width difference between 3.90mm and 5.30mm?

A: The SST25VF016B variants use a wider 8-SOIC package (5.30mm) compared to the original AT26DF161A-SSU (3.90mm). This difference affects PCB footprint compatibility. Physical board layout must be verified to ensure the larger package fits within available space and does not create clearance conflicts with adjacent components.

Q: Why does W25Q16JVSNIQ support Quad I/O when the original part uses standard SPI?

A: The W25Q16JVSNIQ includes Quad I/O capability as an extended feature while maintaining backward compatibility with standard SPI operation. Systems designed for standard SPI interface can operate this device in SPI mode without modification. Quad I/O functionality is optional and requires explicit firmware support to utilize.

Q: Are all three substitutes suitable for -40°C to 85°C operating temperature applications?

A: SST25VF016B-50-4I-S2AF and W25Q16JVSNIQ both support the full -40°C to 85°C range. SST25VF016B-50-4C-S2AF is limited to 0°C to 70°C and is not suitable for extended temperature applications.

Q: What inventory considerations apply to these substitutes?

A: SST25VF016B-50-4I-S2AF has 41,350 units in stock. W25Q16JVSNIQ has 169,476 units in stock. Both are actively manufactured. SST25VF016B-50-4C-S2AF has 22,233 units available. All three maintain current production status with established supply chains.

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