AT25SF161-SHD-B Equivalent & Substitute Parts

Part Overview

The AT25SF161-SHD-B is a 16Mbit NOR Flash memory IC with SPI/Quad I/O interface manufactured by Renesas Electronics Corporation in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates across a 2.5V to 3.6V supply range with a maximum clock frequency of 104 MHz and supports both serial and quad I/O protocols for flexible system integration.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Organization	2M x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF161-SHD-B is determined by the following critical parameters:

Memory Capacity: All substitutes must provide 16Mbit storage with 2M x 8 organization
Interface Protocol: All substitutes must support SPI with Quad I/O capability
Package Compatibility: All substitutes must use 8-SOIC surface mount packaging with identical 5.30mm width
Voltage Compatibility: Substitute supply voltage ranges must encompass or exceed the original 2.5V ~ 3.6V range
Temperature Range: Operating temperature must cover -40°C ~ 85°C minimum
Compliance: All substitutes must maintain ROHS3 compliance

The following parts meet these substitution criteria:

AT25SF161B-SHD-B: Direct Renesas equivalent with improved clock frequency (108 MHz) and active product status
AT25SF161B-SHB-B: Renesas variant with 108 MHz operation and active status; requires voltage range verification (2.7V ~ 3.6V)
AT25FF161A-SHN-B: Renesas high-performance variant with 133 MHz clock and extended low-voltage support (1.65V ~ 3.6V)
W25Q16JVSSIQ: Winbond equivalent with 133 MHz operation, verified programmability, and highest inventory availability

Parameter Comparison

Parameter	AT25SF161-SHD-B	AT25SF161B-SHD-B	AT25SF161B-SHB-B	AT25FF161A-SHN-B	W25Q16JVSSIQ
Manufacturer	Renesas	Renesas	Renesas	Renesas	Winbond
Product Status	Obsolete	Active	Active	Active	Active
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit
Memory Organization	2M x 8	2M x 8	2M x 8	2M x 8	2M x 8
Memory Interface	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O
Clock Frequency	104 MHz	108 MHz	108 MHz	133 MHz	133 MHz
Voltage Supply Range	2.5V ~ 3.6V	2.5V ~ 3.6V	2.7V ~ 3.6V	1.65V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	742 Pcs	900 Pcs	714 Pcs	882 Pcs	205,300 Pcs

Engineering Selection Recommendations

AT25SF161B-SHD-B is the primary direct substitute. It maintains identical voltage specifications (2.5V ~ 3.6V) and package configuration while offering improved performance (108 MHz vs. 104 MHz) and active product status. This part provides the closest functional equivalence with no design modifications required.

AT25FF161A-SHN-B is suitable for applications requiring extended low-voltage operation (1.65V ~ 3.6V) or higher clock frequency (133 MHz). This part is recommended only when system design specifically benefits from these enhanced specifications.

AT25SF161B-SHB-B operates at 108 MHz with a minimum supply voltage of 2.7V. This part is compatible only with systems that do not require operation below 2.7V.

W25Q16JVSSIQ is a cross-manufacturer equivalent from Winbond with 133 MHz operation and verified programmability. This part offers the highest inventory availability (205,300 units) and is suitable for applications where multi-source qualification is required. The minimum supply voltage is 2.7V, requiring verification against system requirements.

All substitute parts maintain ROHS3 compliance and identical 8-SOIC packaging, ensuring mechanical and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can AT25SF161B-SHD-B directly replace AT25SF161-SHD-B without design changes?

A: Yes. Both parts share identical voltage supply range (2.5V ~ 3.6V), operating temperature range (-40°C ~ 85°C), 8-SOIC packaging, and SPI Quad I/O interface. The AT25SF161B-SHD-B offers improved clock frequency (108 MHz vs. 104 MHz) and active product status.

Q: What is the key difference between AT25SF161B-SHD-B and AT25FF161A-SHN-B?

A: The AT25FF161A-SHN-B supports lower minimum supply voltage (1.65V vs. 2.5V) and higher clock frequency (133 MHz vs. 108 MHz). Selection depends on whether your system requires extended low-voltage operation or higher performance.

Q: Is W25Q16JVSSIQ compatible with designs using AT25SF161-SHD-B?

A: W25Q16JVSSIQ is functionally compatible for memory capacity, interface protocol, and package type. However, the minimum supply voltage is 2.7V. Verify that your system does not require operation below 2.7V before substitution.

Q: Why does AT25SF161B-SHB-B have a higher minimum voltage (2.7V) than AT25SF161B-SHD-B (2.5V)?

A: These are separate product variants from Renesas with different electrical specifications. AT25SF161B-SHB-B is suitable only for systems with minimum supply voltage of 2.7V or higher.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use 8-SOIC surface mount packaging with 0.209" width (5.30mm), ensuring identical PCB footprint and mechanical compatibility.

Q: What does "Obsolete" product status mean for AT25SF161-SHD-B?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts with "Active" status ensure long-term availability and continued manufacturing support for new designs and production runs.

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