AT49F002-90PC Equivalent & Substitute Parts

Part Overview

The AT49F002-90PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 90 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates within the 4.5V to 5.5V supply range and supports 256K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F002-90PC

Microchip TechnologyIn Stock: 1048AT49F002-90PC Datasheet

Current PartRFQ

SST39SF020A-70-4C-PHE

Microchip TechnologyIn Stock: 1837SST39SF020A-70-4C-PHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F002-90PC is determined by strict equivalence across the following critical parameters:

• Memory Capacity & Organization: 2Mbit capacity with 256K x 8 organization is mandatory
• Interface Type: Parallel interface architecture must be maintained
• Package Compatibility: 32-DIP (0.600", 15.24mm) through-hole package is required for mechanical and electrical compatibility
• Voltage Specification: 4.5V to 5.5V supply range must be supported
• Operating Temperature Range: 0°C to 70°C compatibility required

The SST39SF020A-70-4C-PHE meets all substitution criteria. While it features improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), these represent performance enhancements rather than incompatibilities. The part maintains identical memory capacity, organization, package form factor, and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the direct functional equivalent for AT49F002-90PC replacement. Selection of this substitute is supported by:

• Product Status: The substitute is active and currently manufactured, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: ROHS3 compliance of the substitute addresses modern environmental and regulatory requirements, whereas the original part is non-compliant
• Electrical Compatibility: Identical memory capacity, organization, interface type, voltage range, and package ensure drop-in compatibility
• Performance Enhancement: Improved access time and write cycle time provide performance benefits without introducing incompatibilities

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE directly replace the AT49F002-90PC in existing designs?

A: Yes. Both devices share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, 32-DIP package, and voltage specifications (4.5V to 5.5V). The substitute operates within the same temperature range and mounting configuration.

Q: What are the performance differences between these parts?

A: The SST39SF020A-70-4C-PHE provides faster access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs). These represent performance improvements that do not create compatibility issues.

Q: Why is the original AT49F002-90PC obsolete?

A: The AT49F002-90PC is classified as obsolete by the manufacturer. The SST39SF020A-70-4C-PHE is the active equivalent, ensuring continued availability and support.

Q: Are there compliance differences between these parts?

A: Yes. The AT49F002-90PC is RoHS non-compliant, while the SST39SF020A-70-4C-PHE is ROHS3 compliant. Both are REACH unaffected and classified under ECCN EAR99.

Q: What is the package compatibility consideration?

A: Both parts use 32-DIP (0.600", 15.24mm) through-hole packages. No PCB layout or socket modifications are required for substitution.