AT26DF161A-SU Equivalent & Substitute Parts

Part Overview

The AT26DF161A-SU is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and is designed for non-volatile data storage applications requiring SPI interface connectivity.

The AT26DF161A-SU is classified as obsolete. 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.

Substiute Parts

AT26DF161A-SU

Renesas Electronics CorporationIn Stock: 16303AT26DF161A-SU Datasheet

Current PartRFQ

SST25VF016B-50-4C-S2AF-T

Microchip TechnologyIn Stock: 3446SST25VF016B-50-4C-S2AF-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT26DF161A-SU is determined by the following critical parameters:

• Memory Capacity: 16Mbit capacity is mandatory for functional equivalence
• Memory Interface: SPI interface is required for system compatibility
• Package Type: 8-SOIC package with 0.209" width and 5.30mm dimensions ensures mechanical and electrical pin compatibility
• Supply Voltage: 2.7V to 3.6V operating range must be supported
• Surface Mount Configuration: Required for PCB assembly compatibility

The SST25VF016B-50-4C-S2AF-T meets these core substitution criteria. While operating frequency differs (50 MHz versus 70 MHz), the SPI interface, 16Mbit capacity, identical package footprint, and overlapping voltage specifications establish functional compatibility within the allowed parameter set.

Parameter Comparison

Engineering Selection Recommendations

The SST25VF016B-50-4C-S2AF-T is an active product from Microchip Technology with verified programmability status and ROHS3 compliance certification. The substitute part maintains electrical and mechanical compatibility through identical package specifications and overlapping supply voltage parameters.

The primary design consideration is the reduced clock frequency of the substitute part (50 MHz versus 70 MHz). System designs operating at or below 50 MHz SPI clock speeds will experience no functional impact. Designs requiring operation above 50 MHz SPI frequency must evaluate timing margins and system performance requirements before implementation.

The substitute part carries active product status, ensuring ongoing availability and supply chain support compared to the obsolete AT26DF161A-SU.

Frequently Asked Questions (FAQ)

Q: Can the SST25VF016B-50-4C-S2AF-T directly replace the AT26DF161A-SU in existing designs?

A: Direct replacement is possible when system SPI clock frequency operates at or below 50 MHz. The identical 8-SOIC package footprint and matching supply voltage range (2.7V to 3.6V) ensure mechanical and electrical compatibility. Designs utilizing SPI frequencies above 50 MHz require timing analysis before substitution.

Q: Are there package compatibility concerns between these parts?

A: No. Both parts use the 8-SOIC package with identical dimensions (0.209" width, 5.30mm). PCB footprints and assembly processes require no modification.

Q: What is the impact of the 20 MHz frequency difference?

A: The SST25VF016B-50-4C-S2AF-T operates at 50 MHz maximum, compared to 70 MHz for the AT26DF161A-SU. This affects maximum data transfer rates. Systems designed for 50 MHz or lower SPI operation experience no performance degradation. Higher-frequency applications must evaluate whether reduced throughput is acceptable.

Q: Does the substitute part meet compliance requirements?

A: The SST25VF016B-50-4C-S2AF-T is ROHS3 compliant and REACH unaffected. Verify compliance requirements against your specific application standards.

Q: What are the write cycle time differences?

A: The AT26DF161A-SU specifies 7µs word write and 5ms page write cycles. The SST25VF016B-50-4C-S2AF-T specifies 10µs word write time. Page write specifications are not provided for the substitute part. Evaluate write performance requirements for your application.