AT25DF161-SSH-B Equivalent & Substitute Parts

Part Overview

The AT25DF161-SSH-B is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation, designed for non-volatile data storage applications requiring 100 MHz operation. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. The 8-SOIC surface mount package and SPI interface define the core functional requirements for equivalent components.

Substiute Parts

AT25DF161-SSH-B

Renesas Electronics CorporationIn Stock: 2208AT25DF161-SSH-B Datasheet

Current PartRFQ

AT25DF321A-SH-B

Renesas Electronics CorporationIn Stock: 1759AT25DF321A-SH-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the AT25DF161-SSH-B is determined by the following critical parameters:

• Memory Interface: SPI protocol compatibility
• Clock Frequency: 100 MHz operation capability
• Voltage Supply Range: 2.7V ~ 3.6V compatibility
• Operating Temperature Range: -40°C ~ 85°C
• Package Type: 8-SOIC surface mount form factor
• Write Cycle Performance: Page write time of 3ms

The AT25DF321A-SH-B qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. While the memory capacity differs (32Mbit versus 16Mbit), the identical interface specifications, voltage requirements, temperature range, and package type enable functional substitution in applications where increased storage capacity is acceptable or beneficial.

Parameter Comparison

Engineering Selection Recommendations

The AT25DF321A-SH-B is the qualified substitute for the obsolete AT25DF161-SSH-B. Selection is based on the following factors:

• Product Status: The AT25DF321A-SH-B maintains active product status with verified programmability, ensuring continued availability and manufacturing support.
• Compliance: The substitute part carries ROHS3 compliance certification and REACH unaffected status, meeting current regulatory requirements.
• Electrical Compatibility: Identical SPI interface, clock frequency, voltage supply range, and operating temperature specifications ensure direct functional compatibility.
• Package Compatibility: Both devices utilize the 8-SOIC surface mount package, enabling direct PCB placement without layout modifications.
• Memory Capacity: The increased 32Mbit capacity of the substitute part provides additional storage without compromising interface or electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can the AT25DF321A-SH-B directly replace the AT25DF161-SSH-B on existing PCBs?

A: Yes. Both devices share identical 8-SOIC package dimensions, pinout compatibility via SPI interface, and electrical specifications. No PCB modifications are required for physical or electrical integration.

Q: Are there differences in memory organization between these parts?

A: The AT25DF161-SSH-B provides 2M x 8 organization (16Mbit total), while the AT25DF321A-SH-B provides 256 Bytes x 16384 pages (32Mbit total). Both maintain SPI interface compatibility and identical page write timing of 3ms.

Q: What is the significance of the package width difference?

A: The AT25DF161-SSH-B specifies 0.154" (3.90mm) width, while the AT25DF321A-SH-B specifies 0.209" (5.30mm) width. Both are standard 8-SOIC packages. Verify PCB footprint compatibility before substitution, as some legacy designs may have tighter spacing constraints.

Q: Does the substitute part require firmware or software modifications?

A: SPI protocol compatibility and identical electrical specifications eliminate the need for firmware changes. Software may require updates only if the application explicitly addresses the 16Mbit memory limitation of the original part.

Q: What are the compliance advantages of the substitute part?

A: The AT25DF321A-SH-B carries ROHS3 compliance and REACH unaffected certification, meeting current environmental and regulatory standards. The original part status is not specified for these certifications.