SST25WF080-75-4I-SAF Equivalent & Substitute Parts

Part Overview

The SST25WF080-75-4I-SAF is an 8Mbit SPI FLASH memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring SPI interface communication. This part operates at 75 MHz clock frequency with a supply voltage range of 1.65V to 1.95V and is housed in an 8-SOIC package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Organization	1M x 8
Memory Interface	SPI
Clock Frequency	75 MHz
Voltage Supply Range	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time	25µs
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SST25WF080-75-4I-SAF is determined by the following critical parameters:

Memory Capacity: 8Mbit (1M x 8 organization)
Interface Protocol: SPI communication standard
Supply Voltage: 1.65V ~ 1.95V compatibility
Package Footprint: 8-SOIC form factor (0.154", 3.90mm Width)
Operating Temperature Range: -40°C ~ 85°C minimum requirement
Compliance: ROHS3 compliance required

Substitute parts must maintain compatibility across these parameters. Clock frequency variations are acceptable provided the substitute operates at or above the minimum required speed for the application. Parts with extended temperature ranges or enhanced interface capabilities (such as Quad I/O support) are functionally compatible while offering additional operational flexibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Memory Interface	Voltage Supply	Operating Temperature	Package	Product Status
SST25WF080-75-4I-SAF	Microchip Technology	8Mbit	75 MHz	SPI	1.65V ~ 1.95V	-40°C ~ 85°C	8-SOIC	Obsolete
SST25WF080B-40I/SN	Microchip Technology	8Mbit	40 MHz	SPI	1.65V ~ 1.95V	-40°C ~ 85°C	8-SOIC	Active
LE25S80FDTWG	onsemi	8Mbit	40 MHz	SPI	1.65V ~ 1.95V	-40°C ~ 90°C	8-SOIC	Active
LE25S81FDTWG	onsemi	8Mbit	40 MHz	SPI	1.65V ~ 1.95V	-40°C ~ 90°C	8-SOIC	Active
LE25S81MCTWG	onsemi	8Mbit	40 MHz	SPI	1.65V ~ 1.95V	-40°C ~ 90°C	8-SOIC	Obsolete
W25Q80EWSNIG	Winbond Electronics	8Mbit	104 MHz	SPI - Quad I/O, QPI	1.65V ~ 1.95V	-40°C ~ 85°C	8-SOIC	Active
W25Q80EWSVIG	Winbond Electronics	8Mbit	104 MHz	SPI - Quad I/O, QPI	1.65V ~ 1.95V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: SST25WF080B-40I/SN

This Microchip Technology part maintains manufacturer continuity and is currently in active production status. It shares identical memory capacity, organization, SPI interface, and supply voltage specifications with the original SST25WF080-75-4I-SAF. The reduced clock frequency (40 MHz versus 75 MHz) is operationally compatible for applications not requiring maximum speed performance. ROHS3 compliance and improved moisture sensitivity level (MSL 1 versus MSL 3) provide enhanced reliability characteristics.

Secondary Recommendations: LE25S80FDTWG and LE25S81FDTWG

onsemi-manufactured alternatives offering active product status and extended operating temperature range (-40°C ~ 90°C). Both parts maintain 8Mbit capacity, SPI interface, and 1.65V ~ 1.95V supply voltage compatibility. These parts are suitable for applications requiring long-term availability assurance.

Alternative Option: W25Q80EWSNIG and W25Q80EWSVIG

Winbond Electronics SpiFlash® series parts provide enhanced performance with 104 MHz clock frequency and Quad I/O capability. These parts maintain core compatibility (8Mbit, SPI interface, 1.65V ~ 1.95V supply) while offering extended interface flexibility. The W25Q80EWSNIG is packaged in standard 8-SOIC; the W25Q80EWSVIG uses 8-VSOP packaging.

Avoid: LE25S81MCTWG

This onsemi part is obsolete and should not be selected for new designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can SST25WF080B-40I/SN replace SST25WF080-75-4I-SAF directly?

A: Yes. Both parts share identical memory capacity (8Mbit), organization (1M x 8), SPI interface, supply voltage range (1.65V ~ 1.95V), operating temperature range (-40°C ~ 85°C), and 8-SOIC package footprint. The 40 MHz clock frequency is operationally compatible with applications designed for 75 MHz operation.

Q: What is the difference between LE25S80FDTWG and LE25S81FDTWG?

A: Both parts are onsemi 8Mbit SPI FLASH devices with identical memory capacity, interface, and voltage specifications. The primary difference is the write cycle time: LE25S80FDTWG has unspecified write cycle time, while LE25S81FDTWG specifies 500µs. Both are functionally compatible substitutes.

Q: Are Winbond W25Q80 parts compatible with SST25WF080-75-4I-SAF?

A: Yes. W25Q80EWSNIG and W25Q80EWSVIG maintain 8Mbit capacity, SPI interface, and 1.65V ~ 1.95V supply voltage compatibility. These parts offer enhanced performance (104 MHz clock frequency) and Quad I/O capability. The primary difference is packaging: W25Q80EWSNIG uses 8-SOIC; W25Q80EWSVIG uses 8-VSOP.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates moisture sensitivity during storage and handling. SST25WF080-75-4I-SAF specifies MSL 3 (168 hours maximum floor life). SST25WF080B-40I/SN specifies MSL 1 (unlimited floor life), providing less stringent moisture control requirements during manufacturing and assembly.

Q: Why is the original SST25WF080-75-4I-SAF marked obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active alternatives from Microchip Technology (SST25WF080B-40I/SN) and other manufacturers (onsemi, Winbond Electronics) provide equivalent functionality with ongoing production support.

Q: Can I use a substitute part with a higher clock frequency?

A: Yes. Parts with higher clock frequencies (such as Winbond W25Q80 at 104 MHz) are backward compatible with applications designed for lower frequencies. The substitute will operate correctly at the lower speed required by your application.

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