IS25WD040-JBLE-TR Equivalent & Substitute Parts

Part Overview

The IS25WD040-JBLE-TR is a 4Mbit NOR Flash memory IC manufactured by ISSI (Integrated Silicon Solution Inc) in an 8-SOIC surface mount package. This component operates at 80 MHz with SPI interface and is designed for non-volatile data storage applications requiring low-voltage operation (1.65V to 1.95V). The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

IS25WD040-JBLE-TR

ISSI, Integrated Silicon Solution IncIn Stock: 813IS25WD040-JBLE-TR Datasheet

Current PartRFQ

IS25WQ040-JBLE

ISSI, Integrated Silicon Solution IncIn Stock: 1136IS25WQ040-JBLE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IS25WD040-JBLE-TR is determined by strict equivalence in the following critical parameters:

• Memory Capacity: 4Mbit (512K x 8 organization) — must remain identical
• Interface Protocol: SPI — must remain identical
• Package Type: 8-SOIC with 5.30mm width — must remain identical
• Supply Voltage Range: 1.65V ~ 1.95V — must remain identical
• Operating Temperature Range: -40°C ~ 105°C — must remain identical
• RoHS and Environmental Compliance: ROHS3 Compliant, MSL 3 — must remain identical

The IS25WQ040-JBLE qualifies as a direct substitute based on full alignment with all critical parameters. While this substitute exhibits improved performance characteristics (104 MHz clock frequency versus 80 MHz, and 1ms write cycle time versus 3ms), these enhancements do not compromise compatibility and represent backward-compatible upgrades within the same product family.

Parameter Comparison

Engineering Selection Recommendations

The IS25WQ040-JBLE is the qualified substitute for the obsolete IS25WD040-JBLE-TR. Selection of this substitute is supported by:

• Product Status: The substitute maintains Active status, ensuring continued availability and manufacturing support
• Compliance Alignment: Both parts maintain identical ROHS3 compliance and MSL 3 ratings, confirming equivalent environmental and handling requirements
• Electrical Compatibility: Identical supply voltage range (1.65V ~ 1.95V) and operating temperature range (-40°C ~ 105°C) ensure direct pin-compatible operation in existing circuit designs
• Package Equivalence: Identical 8-SOIC package dimensions (0.209", 5.30mm Width) confirm mechanical and thermal compatibility with existing PCB layouts

The substitute part is verified as programmable through DiGi-Electronics, confirming functional validation for production environments.

Frequently Asked Questions (FAQ)

Q: Can IS25WQ040-JBLE directly replace IS25WD040-JBLE-TR in existing designs?

A: Yes. Both parts share identical memory capacity (4Mbit), interface protocol (SPI), package type (8-SOIC), supply voltage range (1.65V ~ 1.95V), and operating temperature range (-40°C ~ 105°C). Pin-for-pin compatibility is confirmed.

Q: What are the performance differences between these parts?

A: The substitute operates at 104 MHz clock frequency compared to 80 MHz in the original part, and features a 1ms write cycle time versus 3ms. These represent performance improvements that do not affect backward compatibility.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance, identical MSL 3 ratings (168 Hours), and equivalent REACH and ECCN classifications.

Q: Why is the original part classified as obsolete?

A: The IS25WD040-JBLE-TR is no longer in active production. The IS25WQ040-JBLE represents the current active equivalent within the ISSI product family.

Q: Is the substitute part verified for production use?

A: Yes. The IS25WQ040-JBLE is verified as programmable through DiGi-Electronics and maintains Active product status, confirming suitability for production environments.