AT25SF161-DWF Equivalent & Substitute Parts

Part Overview

The AT25SF161-DWF is a 16Mbit NOR Flash memory IC with SPI Quad I/O interface manufactured by Renesas Electronics Corporation. This component is designed for non-volatile data storage applications requiring high-speed serial access. The part is currently classified as Obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, and electrical operating parameters.

Substiute Parts

AT25SF161-DWF

Renesas Electronics CorporationIn Stock: 639AT25SF161-DWF Datasheet

Current PartRFQ

AT25SF161B-DWF

Renesas Electronics CorporationIn Stock: 1010AT25SF161B-DWF Datasheet

DirectRFQ

AT25FF161A-DWF

Renesas Electronics CorporationIn Stock: 908AT25FF161A-DWF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF161-DWF is determined by the following mandatory parameters:

Core Compatibility Requirements:

• Memory Size: 16Mbit (exact match required)
• Memory Organization: 2M x 8 (exact match required)
• Memory Format: FLASH (exact match required)
• Technology: FLASH - NOR (exact match required)
• Memory Interface: SPI - Quad I/O (exact match required)
• Package Type: Die / Wafer (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)

Allowable Variation Parameters:

• Clock Frequency: May exceed 104 MHz (higher frequency acceptable)
• Write Cycle Time: May differ within functional specifications
• Voltage Supply Range: May be broader or narrower if minimum 2.5V and maximum 3.6V requirements are met
• Product Status: Active status preferred for new applications

Both identified substitute parts meet all core compatibility requirements and are classified as Active products, making them suitable replacements for the Obsolete AT25SF161-DWF.

Parameter Comparison

Engineering Selection Recommendations

AT25SF161B-DWF (Direct Substitute): The AT25SF161B-DWF is the direct evolutionary replacement for the AT25SF161-DWF. Both parts share identical base product numbering (AT25SF161) and maintain full functional compatibility across all core parameters. The AT25SF161B-DWF is classified as Active, ensuring continued availability and manufacturing support. This part exhibits marginally higher clock frequency (108 MHz vs. 104 MHz) and improved page write cycle time (2.4ms vs. 5ms). The minimum supply voltage increases from 2.5V to 2.7V, which may require verification in applications operating at the lower voltage boundary. This substitute is recommended as the primary replacement for new designs and production transitions.

AT25FF161A-DWF (Similar Substitute): The AT25FF161A-DWF represents an alternative from the same manufacturer with enhanced performance characteristics. This part operates at 133 MHz clock frequency and supports a broader supply voltage range (1.65V ~ 3.6V), enabling operation in lower-voltage applications. The AT25FF161A-DWF is classified as Active with confirmed availability. The base product number differs (AT25FF161 vs. AT25SF161), indicating a distinct product line within the Renesas NOR Flash portfolio. This substitute is suitable for applications requiring higher clock frequency or extended low-voltage operation, provided design validation confirms compatibility with the different product series.

Both substitute parts maintain RoHS3 compliance and identical operating temperature specifications. Selection between AT25SF161B-DWF and AT25FF161A-DWF depends on specific application requirements regarding clock frequency, write cycle timing, and supply voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can AT25SF161B-DWF directly replace AT25SF161-DWF without design modification?

A: The AT25SF161B-DWF maintains full functional compatibility across memory capacity, organization, interface protocol, and operating temperature range. The minimum supply voltage specification increases from 2.5V to 2.7V. Applications operating at 2.5V require voltage verification before substitution. All other electrical and mechanical parameters are compatible.

Q: What is the primary difference between AT25SF161B-DWF and AT25FF161A-DWF?

A: Both parts provide 16Mbit SPI Quad I/O NOR Flash memory in wafer packaging. The AT25FF161A-DWF operates at higher clock frequency (133 MHz vs. 108 MHz) and supports lower minimum supply voltage (1.65V vs. 2.7V). The AT25FF161A-DWF belongs to a different product series (AT25FF vs. AT25SF), which may affect firmware or driver compatibility depending on application implementation.

Q: Are there any packaging differences between these parts?

A: All three parts are supplied in identical wafer packaging as die-level components. Mounting type, package case designation, and supplier device package specifications are identical across AT25SF161-DWF, AT25SF161B-DWF, and AT25FF161A-DWF.

Q: Which substitute part should be selected for new product designs?

A: The AT25SF161B-DWF is recommended for new designs as the direct successor to the obsolete AT25SF161-DWF. This part maintains the same product series designation and provides improved performance with Active product status. The AT25FF161A-DWF is suitable for applications requiring higher clock frequency or extended low-voltage operation, contingent upon design validation for the different product series.

Q: What is the impact of different write cycle times on system performance?

A: Write cycle time specifications define the duration required to complete word and page write operations. The AT25SF161-DWF specifies 5µs word and 5ms page write times. The AT25SF161B-DWF requires 50µs word and 2.4ms page write times. The AT25FF161A-DWF requires 12µs word and 8ms page write times. Applications with strict write timing requirements must validate these specifications against system timing constraints.

Q: Is the AT25FF161A-DWF compatible with systems designed for the AT25SF series?

A: The AT25FF161A-DWF provides identical memory capacity, organization, and SPI Quad I/O interface. However, the different product series designation (AT25FF vs. AT25SF) may indicate firmware or driver differences. System-level compatibility validation is required before substitution in existing designs.