IS25WD040-JKLE Equivalent & Substitute Parts

Part Overview

The IS25WD040-JKLE is a 4Mbit NOR Flash memory IC manufactured by Integrated Silicon Solution Inc (ISSI), designed for SPI serial interface applications operating at 80 MHz. This component features a 512K x 8 memory organization in an 8-WSON (6x5) surface mount package and operates across the industrial temperature range of -40°C to 105°C.

The IS25WD040-JKLE is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Format	FLASH - NOR
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	80 MHz
Voltage Supply Range	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 105°C
Package Type	8-WDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the IS25WD040-JKLE is determined by strict alignment across the following critical parameters:

Memory Capacity & Organization: Must maintain 4Mbit capacity with 512K x 8 organization to ensure firmware and data storage compatibility
Memory Interface: SPI interface is mandatory for circuit-level compatibility with existing host controllers
Voltage Supply Range: Must support the 1.65V ~ 1.95V operating window to function within the original power delivery architecture
Operating Temperature Range: Must cover -40°C ~ 105°C to maintain reliability across specified environmental conditions
Package & Pinout: 8-WSON (6x5) package with exposed pad ensures mechanical and electrical compatibility with existing PCB layouts
Compliance Standards: RoHS3 compliance and REACH unaffected status maintain regulatory alignment

The IS25WQ040-JKLE qualifies as a direct substitute based on these parameters. While it operates at an elevated clock frequency (104 MHz versus 80 MHz) and features improved write cycle time (1ms versus 3ms), these enhancements are backward-compatible with designs specified for the original part.

Parameter Comparison

Parameter	IS25WD040-JKLE (Main Part)	IS25WQ040-JKLE (Substitute)
Manufacturer	ISSI	Integrated Silicon Solution
Memory Size	4Mbit	4Mbit
Memory Format	FLASH - NOR	FLASH - NOR
Memory Organization	512K x 8	512K x 8
Memory Interface	SPI	SPI
Clock Frequency	80 MHz	104 MHz
Write Cycle Time	3ms	1ms
Voltage Supply Range	1.65V ~ 1.95V	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C
Package Type	8-WDFN Exposed Pad	8-WDFN Exposed Pad
Supplier Device Package	8-WSON (6x5)	8-WSON (6x5)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The IS25WQ040-JKLE is the manufacturer-recommended substitute for the obsolete IS25WD040-JKLE. Both components maintain identical electrical specifications for memory capacity, interface protocol, voltage supply range, and operating temperature. Both achieve ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

The IS25WQ040-JKLE offers enhanced performance characteristics with increased clock frequency (104 MHz) and reduced write cycle time (1ms), representing a direct upgrade path. The active product status of the IS25WQ040-JKLE ensures long-term supply availability and manufacturing support, addressing the obsolescence constraint of the original part.

Frequently Asked Questions (FAQ)

Q: Can the IS25WQ040-JKLE directly replace the IS25WD040-JKLE without circuit modifications?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (512K x 8), SPI interface, voltage supply range (1.65V ~ 1.95V), operating temperature range (-40°C ~ 105°C), and 8-WSON (6x5) package configuration. No circuit redesign is required.

Q: What are the performance differences between these parts?

A: The IS25WQ040-JKLE operates at 104 MHz clock frequency compared to 80 MHz for the IS25WD040-JKLE, and features a 1ms write cycle time versus 3ms. These represent performance enhancements that are backward-compatible with the original specification.

Q: Are there any compliance or regulatory differences?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity level is identical at MSL 3 (168 Hours). No compliance gaps exist between the two components.

Q: Why is the IS25WD040-JKLE classified as obsolete?

A: The IS25WD040-JKLE has reached end-of-life status. The IS25WQ040-JKLE represents the active successor product from the same manufacturer, offering equivalent functionality with enhanced performance characteristics.

Q: Are there alternative suppliers for these parts?

A: Substitution eligibility is strictly limited to parts meeting the defined electrical and mechanical parameters. Only the IS25WQ040-JKLE is identified as a qualifying substitute based on the provided parameter set.

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