AT49F002NT-90PC Equivalent & Substitute Parts

Part Overview

The AT49F002NT-90PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package with 90 ns access time. This device is classified as obsolete, indicating it has reached end-of-life status and is no longer in active production. The obsolete classification necessitates identification of functionally equivalent substitute components to maintain system compatibility and ensure continued availability for legacy applications and repair operations.

Substiute Parts

AT49F002NT-90PC

Microchip TechnologyIn Stock: 5592AT49F002NT-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 eligibility for the AT49F002NT-90PC is determined by strict alignment of the following critical parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Supply voltage range: 4.5V ~ 5.5V
• Package form factor: 32-DIP (0.600", 15.24mm)
• Mounting technology: Through Hole
• Operating temperature range: 0°C ~ 70°C

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 identical memory capacity, organization, interface, voltage specifications, package dimensions, and temperature range ensure direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for the AT49F002NT-90PC. Selection of this substitute is supported by the following factors:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance satisfies modern environmental and regulatory requirements, whereas the original part is RoHS non-compliant
• Identical electrical and mechanical specifications guarantee direct pin-for-pin compatibility
• Performance improvements in access time and write cycle time provide operational benefits without introducing compatibility concerns
• Both devices share identical REACH and ECCN classifications

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE be used as a direct replacement for the AT49F002NT-90PC?

A: Yes. Both devices are 2Mbit parallel FLASH memory ICs with identical memory organization (256K x 8), supply voltage (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-DIP package dimensions. Pin-for-pin compatibility is confirmed.

Q: What are the performance differences between these parts?

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

Q: Why is the original part classified as obsolete?

A: The AT49F002NT-90PC has reached end-of-life status and is no longer manufactured. The SST39SF020A-70-4C-PHE is an active product that provides equivalent functionality with improved specifications.

Q: Are there compliance differences between the two parts?

A: Yes. The SST39SF020A-70-4C-PHE is ROHS3 compliant, while the AT49F002NT-90PC is RoHS non-compliant. Both share identical REACH and ECCN classifications.

Q: Will the substitute part work in existing circuit designs without modification?

A: Yes. Identical package type, pin count, voltage requirements, and temperature specifications ensure compatibility with existing PCB layouts and circuit designs without modification.