AT49F002N-90PC Equivalent & Substitute Parts

Part Overview

The AT49F002N-90PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 90 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support. The part operates within the 4.5V to 5.5V supply voltage range and supports 256K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F002N-90PC

Microchip TechnologyIn Stock: 924AT49F002N-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 AT49F002N-90PC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Package form factor: 32-DIP with 0.600" (15.24mm) body
• Supply voltage compatibility: 4.5V ~ 5.5V range
• Operating temperature range: 0°C ~ 70°C minimum
• Through-hole mounting requirement

The SST39SF020A-70-4C-PHE meets all substitution criteria. While it provides improved electrical performance (70 ns access time versus 90 ns, and 20µs write cycle versus 50µs), these enhancements are backward-compatible with AT49F002N-90PC applications. Both parts share identical memory capacity, organization, interface protocol, package dimensions, and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the direct functional equivalent for AT49F002N-90PC applications. Selection is based on the following engineering factors:

Product Status: The AT49F002N-90PC is obsolete, while SST39SF020A-70-4C-PHE maintains active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: SST39SF020A-70-4C-PHE achieves ROHS3 compliance, whereas AT49F002N-90PC is RoHS non-compliant. Both parts maintain REACH Unaffected and EAR99 ECCN classifications.

Electrical Performance: SST39SF020A-70-4C-PHE delivers superior access time (70 ns versus 90 ns) and write cycle time (20µs versus 50µs) while maintaining full backward compatibility with existing circuit designs.

Package and Mounting: Both parts utilize identical 32-DIP through-hole packaging, enabling direct socket substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A-70-4C-PHE replace AT49F002N-90PC in existing designs?

A: Yes. Both parts share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-DIP package form factor. The substitute provides improved electrical performance and requires no circuit modifications.

Q: What are the key differences between these parts?

A: Access time improves from 90 ns to 70 ns. Write cycle time improves from 50µs to 20µs. Product status changes from obsolete to active. RoHS compliance improves from non-compliant to ROHS3 compliant. All other parameters remain equivalent.

Q: Are the package dimensions identical?

A: Yes. Both parts use 32-DIP packaging with 0.600" (15.24mm) body dimensions, enabling direct through-hole socket substitution.

Q: What is the supply voltage requirement for both parts?

A: Both AT49F002N-90PC and SST39SF020A-70-4C-PHE operate within the 4.5V to 5.5V supply voltage range with identical specifications.

Q: Does the substitute part affect circuit timing?

A: No. The SST39SF020A-70-4C-PHE provides faster access and write cycle times, which are backward-compatible with designs specified for the slower AT49F002N-90PC. Existing timing margins are maintained or improved.

Q: What is the operating temperature range for both parts?

A: Both parts operate across 0°C to 70°C, meeting identical thermal specifications for industrial and commercial applications.