AT49F002NT-70PC Equivalent & Substitute Parts

Part Overview

The AT49F002NT-70PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package with 70 ns access time. This device is classified as obsolete and is no longer in active production. Due to its obsolete status and the need for continued system support, identifying functionally equivalent substitute components is essential for maintenance, repair, and legacy system continuity.

Substiute Parts

AT49F002NT-70PC

Microchip TechnologyIn Stock: 1907AT49F002NT-70PC 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-70PC is determined by strict alignment of the following critical parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Access time: 70 ns or faster
• Supply voltage: 4.5V ~ 5.5V compatibility
• Package: 32-DIP (0.600", 15.24mm)
• Mounting: Through Hole

The SST39SF020A-70-4C-PHE meets all substitution criteria. Both devices share identical memory specifications, electrical characteristics, and physical packaging, enabling direct functional replacement in legacy systems.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the direct functional equivalent for the AT49F002NT-70PC. Selection of this substitute is based on:

• Identical electrical and timing specifications across all critical parameters
• Active product status ensuring continued availability and supply chain reliability
• ROHS3 compliance, providing regulatory advantage over the non-compliant original part
• Faster write cycle time (20µs vs. 50µs), which does not compromise backward compatibility
• Identical physical packaging enabling direct socket replacement without PCB modification
• Both devices manufactured by Microchip Technology, ensuring consistent quality and documentation standards

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices are 2Mbit parallel FLASH memory ICs with identical memory organization (256K x 8), access time (70 ns), supply voltage (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-DIP package dimensions. Direct socket replacement is possible without circuit modification.

Q: What is the difference in write cycle time between these parts?

A: The AT49F002NT-70PC has a write cycle time of 50µs, while the SST39SF020A-70-4C-PHE has 20µs. The substitute is faster, which is compatible with legacy systems designed for the original part and does not introduce timing conflicts.

Q: Are there any compliance differences?

A: The AT49F002NT-70PC is RoHS non-compliant, while the SST39SF020A-70-4C-PHE is ROHS3 compliant. Both are REACH unaffected and carry the same ECCN and HTSUS classifications.

Q: Is the packaging identical?

A: Yes. Both parts use 32-DIP (0.600", 15.24mm) through-hole packaging with identical pin configurations, enabling direct PCB replacement without layout changes.

Q: Why is the original part listed as obsolete?

A: The AT49F002NT-70PC has reached end-of-life status and is no longer manufactured. The SST39SF020A-70-4C-PHE remains in active production, providing a viable path for system maintenance and new builds requiring this memory specification.