W39V040FAPZ Equivalent & Substitute Parts

Part Overview

The W39V040FAPZ is a 4Mbit parallel FLASH memory IC manufactured by Winbond Electronics in a 32-PLCC package with 300 ns access time. This device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing system support and new design implementations. The part operates within the 3V to 3.6V supply range and is suitable for applications requiring non-volatile parallel memory storage in surface mount configurations.

Substiute Parts

W39V040FAPZ

Winbond ElectronicsIn Stock: 1263W39V040FAPZ Datasheet

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SST39LF040-55-4C-NHE

Microchip TechnologyIn Stock: 1675SST39LF040-55-4C-NHE Datasheet

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SST39VF040-70-4C-NHE

Microchip TechnologyIn Stock: 15756SST39VF040-70-4C-NHE Datasheet

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SST39VF040-70-4I-NHE

Microchip TechnologyIn Stock: 19108SST39VF040-70-4I-NHE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the W39V040FAPZ is determined by strict equivalence across the following critical parameters:

Memory Capacity and Organization: All substitute parts must provide 4Mbit capacity in 512K x 8 organization to maintain functional compatibility with existing system designs.

Package and Pinout: All substitutes utilize the 32-PLCC (11.43x13.97) package with J-Lead configuration, ensuring mechanical and electrical compatibility with existing PCB layouts.

Memory Interface: Parallel interface architecture is maintained across all substitutes to preserve system-level signal compatibility.

Supply Voltage Compatibility: The original part operates at 3V to 3.6V. Substitute parts with extended voltage ranges (2.7V to 3.6V) remain compatible with the original specification while offering broader operational flexibility.

Access Time: The original part specifies 300 ns access time. Substitute parts with faster access times (55 ns, 70 ns) are electrically compatible and provide performance enhancement without functional degradation.

Compliance Standards: All substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing.

Parameter Comparison

Engineering Selection Recommendations

SST39LF040-55-4C-NHE: This substitute provides the fastest access time at 55 ns while maintaining the original 3V to 3.6V supply voltage specification. The part is manufactured by Microchip Technology and carries active product status with verified programmability. This option is suitable for applications requiring performance optimization within the original voltage constraints.

SST39VF040-70-4C-NHE: This substitute offers 70 ns access time with extended voltage range (2.7V to 3.6V) and active product status. Programmability has not been verified for this variant. The extended voltage range provides operational flexibility for systems with variable supply conditions.

SST39VF040-70-4I-NHE: This substitute provides 70 ns access time with extended voltage range (2.7V to 3.6V) and extended operating temperature range (-40°C to 85°C). The part carries active product status with verified programmability. This option is recommended for applications requiring extended temperature operation beyond the original 0°C to 70°C specification.

All three substitutes are ROHS3 compliant and REACH unaffected, maintaining regulatory equivalence with the original W39V040FAPZ component.

Frequently Asked Questions (FAQ)

Q: Can SST39VF040-70-4I-NHE be used as a direct replacement for W39V040FAPZ in existing designs?

A: Yes. The SST39VF040-70-4I-NHE maintains identical memory capacity (4Mbit), organization (512K x 8), parallel interface, and 32-PLCC package configuration. The extended voltage range (2.7V to 3.6V) encompasses the original 3V to 3.6V specification. The faster access time (70 ns versus 300 ns) is electrically compatible and does not introduce functional incompatibility.

Q: What is the primary difference between SST39LF040-55-4C-NHE and SST39VF040-70-4C-NHE?

A: The primary differences are access time (55 ns versus 70 ns) and voltage supply range. SST39LF040-55-4C-NHE maintains the original 3V to 3.6V specification with faster performance. SST39VF040-70-4C-NHE extends the voltage range to 2.7V to 3.6V with slightly slower access time. Both parts are electrically compatible with the original W39V040FAPZ.

Q: Why does SST39VF040-70-4I-NHE have a different operating temperature range?

A: The SST39VF040-70-4I-NHE is specified for industrial temperature range (-40°C to 85°C) compared to the commercial range (0°C to 70°C) of the original part. This extended range is a device characteristic and does not affect compatibility in applications operating within the original 0°C to 70°C specification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (SST39LF040-55-4C-NHE, SST39VF040-70-4C-NHE, and SST39VF040-70-4I-NHE) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original W39V040FAPZ.

Q: What does "verified programmability" indicate?

A: Verified programmability indicates that the part has been tested and confirmed to support standard programming protocols. SST39LF040-55-4C-NHE and SST39VF040-70-4I-NHE carry verified programmability status. SST39VF040-70-4C-NHE programmability has not been verified through this supplier.

Q: Can faster access time substitutes cause timing issues in existing designs?

A: No. Faster access time (55 ns or 70 ns) compared to the original 300 ns specification does not introduce timing violations. System designs accommodate the original access time specification; faster substitutes maintain backward compatibility without requiring timing adjustments.