AT49F001-70PC Equivalent & Substitute Parts

Part Overview

The AT49F001-70PC 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, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates within the 4.5V to 5.5V supply range and supports through-hole mounting applications requiring non-volatile memory storage.

Substiute Parts

AT49F001-70PC

Microchip TechnologyIn Stock: 848AT49F001-70PC 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 AT49F001-70PC is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Memory Interface: Parallel (32-DIP pinout compatibility)
• Package Type: 32-DIP (0.600", 15.24mm)
• Access Time: 70 ns or faster
• Voltage Supply Range: 4.5V ~ 5.5V
• Mounting Type: Through Hole

Acceptable Variation Parameters:

• Memory Size: Equal or greater capacity (1Mbit minimum)
• Memory Organization: Compatible with 128K x 8 or higher density
• Write Cycle Time: May vary (not a substitution-limiting factor)
• Operating Temperature: 0°C ~ 70°C or wider range

The SST39SF020A-70-4C-PHE meets all mandatory compatibility criteria while offering increased memory capacity and improved product status.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is a direct functional substitute for the AT49F001-70PC based on the following engineering criteria:

Electrical Compatibility: Both devices operate at identical voltage supply ranges (4.5V ~ 5.5V), access times (70 ns), and temperature ranges (0°C ~ 70°C). The parallel interface and 32-DIP package ensure pin-level compatibility without circuit modification.

Product Status Advantage: The SST39SF020A-70-4C-PHE maintains active product status with ROHS3 compliance, addressing the obsolescence of the AT49F001-70PC and meeting modern regulatory requirements.

Performance Enhancement: The substitute device provides doubled memory capacity (2Mbit vs. 1Mbit) and improved write cycle time (20µs vs. 50µs), delivering superior performance within the same physical and electrical constraints.

Supply Continuity: With 1764 units in stock, the SST39SF020A-70-4C-PHE ensures reliable component availability for production and maintenance applications.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE replace the AT49F001-70PC without circuit modifications?

A: Yes. Both devices share identical pinouts (32-DIP), voltage supply ranges (4.5V ~ 5.5V), access times (70 ns), and operating temperatures (0°C ~ 70°C). Direct socket substitution is supported.

Q: What is the primary reason for substitution?

A: The AT49F001-70PC is classified as obsolete. The SST39SF020A-70-4C-PHE provides equivalent functionality with active product status and ROHS3 compliance.

Q: Does the increased memory capacity (2Mbit vs. 1Mbit) affect compatibility?

A: No. Higher memory capacity is a compatible enhancement. Systems designed for 1Mbit operation function correctly with 2Mbit devices; the additional address space remains unused if not required by the application.

Q: Are the write cycle times interchangeable?

A: Yes. The SST39SF020A-70-4C-PHE features a faster write cycle time (20µs vs. 50µs), which is a performance improvement and does not create compatibility issues.

Q: What packaging format is supplied for the substitute part?

A: The SST39SF020A-70-4C-PHE is supplied in tube packaging, suitable for automated assembly and manual handling.