AT49F001-55PC Equivalent & Substitute Parts

Part Overview

The AT49F001-55PC is a 1Mbit 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 new designs and production continuity. The part operates within the 4.5V to 5.5V supply voltage range and supports through-hole mounting applications requiring non-volatile parallel memory storage.

Substiute Parts

AT49F001-55PC

Microchip TechnologyIn Stock: 830AT49F001-55PC 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 AT49F001-55PC is determined by the following critical parameters:

• Package Compatibility: Both parts must use 32-DIP (0.600", 15.24mm) through-hole packaging to ensure PCB footprint compatibility
• Voltage Supply Range: Both parts must operate within 4.5V to 5.5V to maintain circuit compatibility
• Memory Interface: Both parts must provide parallel memory interface for signal compatibility
• Operating Temperature Range: Both parts must support 0°C to 70°C operation
• Pin Configuration: Identical 32-PDIP pin count and arrangement

The SST39SF020A-70-4C-PHE meets all substitution criteria. While it provides 2Mbit capacity (versus 1Mbit in the original), this represents a functional upgrade within the same package and electrical interface, allowing direct replacement in applications where increased memory capacity is beneficial or neutral.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for AT49F001-55PC based on the following factors:

• Product Status: The substitute is Active, ensuring continued availability and manufacturing support, whereas the original part is Obsolete
• Regulatory Compliance: The substitute achieves ROHS3 compliance, meeting modern environmental and regulatory requirements
• Electrical Compatibility: Identical voltage supply range (4.5V ~ 5.5V) and operating temperature range (0°C ~ 70°C) ensure direct circuit compatibility
• Package Equivalence: Both parts use identical 32-DIP through-hole packaging, enabling direct PCB footprint replacement
• Memory Interface: Both parts provide parallel memory interface with identical pin configuration
• Performance Characteristics: The substitute offers improved write cycle time (20µs versus 50µs), though access time is slightly slower (70 ns versus 55 ns)

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A-70-4C-PHE be used as a direct replacement for AT49F001-55PC?

A: Yes. Both parts share identical package type (32-DIP), voltage supply range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and parallel memory interface. The 32-pin through-hole configuration is identical, enabling direct PCB replacement.

Q: What is the difference in memory capacity between these parts?

A: AT49F001-55PC provides 1Mbit (128K x 8) capacity, while SST39SF020A-70-4C-PHE provides 2Mbit (256K x 8) capacity. The substitute offers double the addressable memory within the same package footprint.

Q: How do access times compare?

A: AT49F001-55PC has 55 ns access time, while SST39SF020A-70-4C-PHE has 70 ns access time. The substitute is 15 ns slower. Applications with strict timing requirements must verify compatibility with system clock frequencies.

Q: What is the difference in write cycle time?

A: AT49F001-55PC has 50µs write cycle time, while SST39SF020A-70-4C-PHE has 20µs write cycle time. The substitute offers faster write operations.

Q: Are there compliance differences?

A: Yes. AT49F001-55PC is RoHS non-compliant, while SST39SF020A-70-4C-PHE is ROHS3 compliant. For applications requiring environmental compliance certification, the substitute meets modern regulatory standards.

Q: Is the pin configuration identical?

A: Yes. Both parts use 32-PDIP package configuration with identical pin assignments for parallel memory interface operation.