AT49F001N-70PC Equivalent & Substitute Parts

Part Overview

The AT49F001N-70PC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-DIP 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 limited availability for new designs, identifying functionally compatible substitute parts is essential for system maintenance, legacy product support, and design continuity.

Substiute Parts

AT49F001N-70PC

Microchip TechnologyIn Stock: 967AT49F001N-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 of the AT49F001N-70PC is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Memory Interface: Parallel (pin-compatible architecture required)
• Package / Case: 32-DIP (0.600", 15.24mm) (physical and electrical pin compatibility)
• Voltage Supply: 4.5V ~ 5.5V (operating voltage range overlap)
• Access Time: 70 ns or faster (timing specification must meet or exceed original)
• Operating Temperature: 0°C ~ 70°C (thermal operating range compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)

Acceptable Variation Parameters:

• Memory Size: Can be equal or larger (1Mbit or greater)
• Memory Organization: Can differ if total capacity is maintained or exceeded
• Write Cycle Time: Can be faster than original specification

The SST39SF020A-70-4C-PHE meets all mandatory compatibility parameters and represents a direct functional substitute with enhanced specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is a qualified substitute for the AT49F001N-70PC based on the following engineering criteria:

Product Status Advantage: The substitute part is in active production status, ensuring long-term availability and supply chain reliability compared to the obsolete AT49F001N-70PC.

Compliance Enhancement: The SST39SF020A-70-4C-PHE is ROHS3 compliant, meeting current regulatory requirements, whereas the original part is RoHS non-compliant. This is significant for new designs and systems requiring compliance with modern environmental standards.

Electrical Compatibility: Both parts operate within identical voltage supply ranges (4.5V ~ 5.5V) and temperature ranges (0°C ~ 70°C), with matching 70 ns access times. The parallel interface and 32-DIP package ensure direct pin compatibility.

Performance Enhancement: The substitute part offers improved write cycle time (20µs versus 50µs) and double the memory capacity (2Mbit versus 1Mbit), providing performance benefits without compromising backward compatibility.

REACH and ECCN Alignment: Both parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99), maintaining regulatory consistency.

Frequently Asked Questions (FAQ)

Q: Is the SST39SF020A-70-4C-PHE a direct pin-for-pin replacement for the AT49F001N-70PC?

A: Yes. Both devices use the 32-DIP (0.600", 15.24mm) package with identical pin assignments for parallel FLASH memory interface. No PCB modifications are required for physical substitution.

Q: Will the increased memory capacity (2Mbit vs. 1Mbit) cause compatibility issues?

A: No. The substitute part maintains the same 8-bit word width (256K x 8 organization) and parallel interface protocol. Systems designed for the 1Mbit device will function correctly with the 2Mbit substitute. Address decoding and data bus connections remain compatible.

Q: What is the significance of the faster write cycle time in the substitute part?

A: The SST39SF020A-70-4C-PHE has a write cycle time of 20µs compared to the original 50µs. This represents improved performance and does not create compatibility issues, as the substitute meets or exceeds all timing specifications of the original part.

Q: Are there any voltage or temperature operating range differences?

A: No. Both parts operate identically across the 4.5V to 5.5V supply voltage range and 0°C to 70°C temperature range. Operating conditions are fully compatible.

Q: Why is RoHS compliance important for this substitution?

A: The substitute part is ROHS3 compliant while the original is RoHS non-compliant. For new designs, system upgrades, or applications subject to environmental regulations, the compliant substitute ensures adherence to current standards without design changes.

Q: Can the SST39SF020A-70-4C-PHE be used in legacy systems currently using the AT49F001N-70PC?

A: Yes. The electrical and mechanical compatibility, combined with identical access time and voltage specifications, makes the substitute suitable for legacy system maintenance and field replacements.

Q: What is the difference between the 32-PDIP and 32-DIP package designations?

A: These designations refer to the same physical package format: a 32-pin dual inline package with 0.600" (15.24mm) body width. Both the original and substitute parts use this identical package, ensuring mechanical and electrical compatibility.