IS25WD040-JBLE Equivalent & Substitute Parts

Part Overview

The IS25WD040-JBLE is a 4Mbit NOR Flash memory IC with SPI interface, manufactured by Integrated Silicon Solution (ISSI). This device operates at 80 MHz and is housed in an 8-SOIC surface mount package. The part is currently classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations. Substitute parts must maintain electrical and mechanical compatibility while meeting the same functional requirements for NOR Flash memory applications requiring SPI serial interface communication.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile FLASH
Memory Size	4Mbit
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-SOIC (0.209", 5.30mm Width)
Write Cycle Time	3ms
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution compatibility for the IS25WD040-JBLE is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide 4Mbit capacity with 512K x 8 organization to ensure direct functional equivalence
Interface Protocol: SPI interface is mandatory; no alternative serial protocols are acceptable
Supply Voltage Range: 1.65V ~ 1.95V operating range must be maintained for power supply compatibility
Operating Temperature Range: -40°C ~ 105°C specification must be met or exceeded
Package Footprint: 8-SOIC (0.209", 5.30mm Width) ensures PCB layout compatibility without redesign
Compliance Standards: RoHS3 compliance and MSL 3 rating must be maintained

The IS25WQ040-JBLE qualifies as a direct substitute based on matching all critical parameters while offering enhanced performance characteristics.

Parameter Comparison

Parameter	IS25WD040-JBLE (Main Part)	IS25WQ040-JBLE (Substitute)
Manufacturer	ISSI / Integrated Silicon Solution	ISSI / Integrated Silicon Solution Inc
Memory Size	4Mbit	4Mbit
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-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The IS25WQ040-JBLE is a qualified substitute for the IS25WD040-JBLE based on the following engineering criteria:

Compliance & Availability: The substitute part maintains ROHS3 compliance and MSL 3 rating, ensuring regulatory and environmental compatibility. The substitute is currently in active production status with verified availability (1038 pcs in stock), whereas the main part is obsolete.

Electrical Compatibility: Both parts operate within identical voltage supply ranges (1.65V ~ 1.95V) and temperature specifications (-40°C ~ 105°C), ensuring direct compatibility with existing power distribution and thermal management systems.

Mechanical Compatibility: Identical 8-SOIC package footprint (0.209", 5.30mm Width) permits direct PCB substitution without layout modifications.

Performance Enhancement: The substitute part provides improved performance through higher clock frequency (104 MHz vs. 80 MHz) and reduced write cycle time (1ms vs. 3ms), delivering faster memory operations while maintaining backward compatibility.

Frequently Asked Questions (FAQ)

Q: Can IS25WQ040-JBLE be used as a direct replacement for IS25WD040-JBLE?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (512K x 8), SPI interface, supply voltage range (1.65V ~ 1.95V), operating temperature range (-40°C ~ 105°C), and 8-SOIC package footprint. No PCB modifications or firmware changes are required.

Q: What are the key differences between these parts?

A: The substitute part operates at higher clock frequency (104 MHz vs. 80 MHz) and features faster write cycle time (1ms vs. 3ms). The substitute is in active production, whereas the main part is obsolete.

Q: Are there any compatibility concerns with the package?

A: No. Both parts use identical 8-SOIC (0.209", 5.30mm Width) packaging, ensuring pin-for-pin compatibility and identical PCB footprint requirements.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant with MSL 3 rating (168 Hours), meeting identical environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: The IS25WQ040-JBLE is recommended for new designs due to active production status, improved performance characteristics, and verified availability.

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