AT49F002-55PI Equivalent & Substitute Parts

Part Overview

The AT49F002-55PI is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 55 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 voltage range and supports 256K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F002-55PI

Microchip TechnologyIn Stock: 1201AT49F002-55PI 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 AT49F002-55PI is determined by strict equivalence across the following parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Package format: 32-DIP with 0.600" (15.24mm) body width
• Supply voltage compatibility: 4.5V ~ 5.5V range
• Memory technology: FLASH non-volatile

The SST39SF020A-70-4C-PHE qualifies as a substitute based on matching memory size, organization, interface, package dimensions, and voltage specifications. Access time differences (55 ns vs. 70 ns) and operating temperature ranges represent secondary parameters that do not prevent functional substitution in parallel FLASH memory applications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for the AT49F002-55PI based on the following criteria:

• Identical memory capacity and organization (2Mbit, 256K x 8)
• Matching parallel interface and 32-DIP package footprint
• Compatible supply voltage range (4.5V ~ 5.5V)
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance provides regulatory advantage over the non-compliant AT49F002-55PI
• Faster write cycle time (20µs vs. 50µs) represents a performance improvement

The substitute part operates at 70 ns access time compared to the original 55 ns specification. Operating temperature range differs (0°C ~ 70°C vs. -40°C ~ 85°C), which may require evaluation for applications requiring extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE directly replace the AT49F002-55PI in existing designs?

A: Yes, for applications where the 70 ns access time and 0°C ~ 70°C operating temperature range are acceptable. Both parts share identical memory capacity, organization, parallel interface, supply voltage, and 32-DIP package dimensions, enabling direct socket substitution.

Q: What is the primary difference between these two parts?

A: The AT49F002-55PI offers faster access time (55 ns) and extended temperature operation (-40°C ~ 85°C), while the SST39SF020A-70-4C-PHE provides faster write cycles (20µs vs. 50µs), active product status, and RoHS3 compliance.

Q: Are there package compatibility concerns?

A: No. Both parts use identical 32-DIP packaging with 0.600" (15.24mm) body width and through-hole mounting, ensuring mechanical and electrical compatibility on PCBs designed for either component.

Q: Why is the AT49F002-55PI classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SST39SF020A-70-4C-PHE, with active product status, provides a viable path for continued component sourcing and design support.

Q: Does RoHS compliance affect substitution suitability?

A: RoHS3 compliance of the substitute part meets modern regulatory requirements. Applications subject to RoHS directives benefit from the SST39SF020A-70-4C-PHE's compliance status compared to the non-compliant AT49F002-55PI.