AT49F002-55PC Equivalent & Substitute Parts

Part Overview

The AT49F002-55PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP package with 55 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates within the 4.5V to 5.5V supply voltage range and supports through-hole mounting applications requiring non-volatile memory storage.

Substiute Parts

AT49F002-55PC

Microchip TechnologyIn Stock: 1073AT49F002-55PC 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 AT49F002-55PC is determined by the following critical parameters:

• Memory capacity (2Mbit) and organization (256K x 8) must remain identical
• Parallel interface architecture must be maintained
• Package form factor must be 32-DIP with identical pin configuration
• Supply voltage range must encompass 4.5V ~ 5.5V
• Operating temperature range must support 0°C ~ 70°C minimum
• Access time and write cycle time may vary within acceptable system timing margins

The SST39SF020A-70-4C-PHE meets all substitution criteria while offering improved specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for AT49F002-55PC applications. Selection is based on:

• Identical memory capacity and organization ensure direct functional equivalence
• Matching parallel interface and 32-DIP package enable pin-for-pin replacement
• Identical supply voltage and operating temperature ranges confirm system compatibility
• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance provides regulatory advantage over the non-compliant original part
• Improved write cycle time (20µs vs 50µs) offers performance enhancement
• Access time differential (70 ns vs 55 ns) remains within typical system timing tolerances for parallel FLASH memory applications

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices 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 configuration. Pin-for-pin replacement is supported.

Q: What is the significance of the access time difference (55 ns vs 70 ns)?

A: The substitute part has a 15 ns slower access time. This difference is acceptable in most parallel FLASH memory applications where system timing margins accommodate this variance. System-level timing analysis is required only for applications with critical access time constraints below 70 ns.

Q: Why is RoHS compliance important for this substitution?

A: The substitute part (SST39SF020A-70-4C-PHE) is ROHS3 compliant, while the original (AT49F002-55PC) is non-compliant. ROHS3 compliance is required for new designs and systems subject to environmental regulations in the EU and other jurisdictions.

Q: Does the improved write cycle time affect system operation?

A: The substitute part offers faster write cycle time (20µs vs 50µs), which is a performance improvement. This does not create compatibility issues; systems designed for the original 50µs specification will operate correctly with the faster 20µs performance.

Q: Are there packaging differences between these parts?

A: No. Both parts use identical 32-DIP (0.600", 15.24mm) through-hole packaging. PCB layout and socket compatibility remain unchanged.