AT49F002NT-90JC Equivalent & Substitute Parts

Part Overview

The AT49F002NT-90JC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 90 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part operates within the 4.5V to 5.5V supply range and is suitable for applications requiring non-volatile parallel memory storage.

Substiute Parts

AT49F002NT-90JC

Microchip TechnologyIn Stock: 1892AT49F002NT-90JC Datasheet

Current PartRFQ

SST39SF020A-70-4C-NHE

Microchip TechnologyIn Stock: 29306SST39SF020A-70-4C-NHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT49F002NT-90JC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Package format: 32-PLCC (J-Lead)
• Supply voltage: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Memory technology: FLASH (non-volatile)

The SST39SF020A-70-4C-NHE meets all substitution criteria. While it offers improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), these represent performance enhancements rather than deviations from the core electrical and mechanical specifications required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-NHE is the direct functional equivalent for the obsolete AT49F002NT-90JC. Selection of the substitute part is justified by:

• Identical memory capacity, organization, and parallel interface architecture
• Identical supply voltage and operating temperature specifications
• Identical package footprint and mounting configuration
• Active product status with confirmed availability (29,200 units in stock)
• ROHS3 compliance, addressing regulatory requirements not met by the original part
• Performance improvements in access time and write cycle time, providing design margin without requiring circuit modifications

The substitute part is electrically and mechanically interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, supply voltage (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-PLCC package format. The substitute part is electrically and mechanically interchangeable.

Q: What are the performance differences between these parts?

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

Q: Are there any compliance differences?

A: The original AT49F002NT-90JC is RoHS non-compliant, while the SST39SF020A-70-4C-NHE is ROHS3 compliant. The substitute part meets current regulatory requirements for new designs.

Q: Is the package footprint identical?

A: Yes. Both parts use the 32-PLCC (J-Lead) package with identical pin configuration and PCB footprint. No layout modifications are required.

Q: What is the moisture sensitivity difference?

A: The original part has MSL 2 (1 Year), while the substitute has MSL 3 (168 Hours). This requires stricter moisture control during storage and handling for the substitute part.

Q: Why is the original part listed as obsolete?

A: The AT49F002NT-90JC is no longer in active production. The SST39SF020A-70-4C-NHE represents the current active equivalent from the same manufacturer.