LE25S20FD-AH Equivalent & Substitute Parts

Part Overview

The LE25S20FD-AH is a 2Mbit FLASH memory IC manufactured by onsemi, designed for SPI interface applications operating at 40 MHz. This non-volatile memory device is actively produced and widely used in embedded systems requiring reliable serial peripheral interface memory storage. The part is packaged in 8-VSOIC surface mount configuration and operates across industrial temperature ranges (-40°C to 85°C). Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging dimensions align with the original component, enabling direct replacement in circuit designs without functional compromise.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	SPI
Clock Frequency	40 MHz
Write Cycle Time	4.6ms
Voltage Supply Range	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC / 8-VSOIC
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LE25S20FD-AH is determined by strict alignment of the following critical parameters:

Memory capacity: 2Mbit (256K x 8 organization)
Serial interface protocol: SPI
Operating frequency: 40 MHz
Supply voltage range: 1.65V ~ 1.95V
Temperature operating range: -40°C ~ 85°C
Physical package: 8-pin SOIC/VSOIC surface mount configuration
Regulatory compliance: ROHS3 and REACH status

The SST25WF020A-40I/SN manufactured by Microchip Technology meets all specified electrical and mechanical parameters, establishing it as a direct functional equivalent. Both devices share identical memory specifications, interface characteristics, voltage requirements, and thermal operating conditions. Package dimensions (0.154" width, 3.90mm) are equivalent between 8-SOIC and 8-VSOIC variants, permitting direct PCB placement compatibility.

Parameter Comparison

Parameter	LE25S20FD-AH (onsemi)	SST25WF020A-40I/SN (Microchip)	Match Status
Memory Size	2Mbit	2Mbit	Identical
Memory Organization	256K x 8	256K x 8	Identical
Memory Interface	SPI	SPI	Identical
Clock Frequency	40 MHz	40 MHz	Identical
Write Cycle Time	4.6ms	4.6ms	Identical
Voltage Supply Range	1.65V ~ 1.95V	1.65V ~ 1.95V	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package / Case	8-VSOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	Compatible
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

Both the LE25S20FD-AH and SST25WF020A-40I/SN are active production devices with full regulatory compliance (ROHS3 and REACH). Selection between these parts should be based on availability, lead time, and supply chain requirements rather than technical performance differences. The SST25WF020A-40I/SN carries DiGi-Electronics Programmable verification status, confirming compatibility with standard programming equipment. The LE25S20FD-AH offers equivalent functionality with identical electrical specifications. Moisture sensitivity levels differ (MSL 3 versus MSL 1), which may influence storage and handling procedures but does not affect operational performance in sealed applications.

Frequently Asked Questions (FAQ)

Q: Can SST25WF020A-40I/SN directly replace LE25S20FD-AH on existing PCBs?

A: Yes. Both devices share identical pin configurations, package dimensions (8-pin SOIC/VSOIC, 0.154" width), and electrical specifications. Direct PCB substitution is supported without design modifications.

Q: Are the SPI interface protocols identical between these parts?

A: Yes. Both devices implement standard SPI serial peripheral interface at 40 MHz with matching voltage levels (1.65V ~ 1.95V) and timing characteristics (4.6ms write cycle time).

Q: What is the difference between 8-SOIC and 8-VSOIC packaging?

A: Both are 8-pin surface mount packages with identical external dimensions (0.154" width, 3.90mm). VSOIC denotes a very small outline variant. Physical compatibility on PCBs is maintained.

Q: Do moisture sensitivity levels affect substitution compatibility?

A: Moisture sensitivity levels (MSL 3 versus MSL 1) determine storage and handling requirements but do not affect electrical performance or functional compatibility in sealed end-use applications.

Q: Are firmware or software modifications required when switching between these parts?

A: No. Identical SPI interface protocols, memory organization (256K x 8), and electrical specifications eliminate the need for firmware or software changes.

Q: What is the temperature operating range for both devices?

A: Both parts operate across -40°C to 85°C, supporting industrial and commercial temperature specifications without performance degradation.

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