AT49F001N-90VC Equivalent & Substitute Parts

Part Overview

The AT49F001N-90VC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-VSOP package with 90 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for new designs, legacy system repairs, and production continuity. The part operates within the 4.5V to 5.5V supply range and supports 128K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F001N-90VC

Microchip TechnologyIn Stock: 867AT49F001N-90VC Datasheet

Current PartRFQ

SST39SF010A-70-4C-WHE

Microchip TechnologyIn Stock: 3020SST39SF010A-70-4C-WHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F001N-90VC is determined by strict alignment of the following parameters:

• Memory capacity: 1Mbit (128K x 8 organization)
• Interface type: Parallel
• Supply voltage: 4.5V ~ 5.5V compatibility
• Package footprint: 32-TFSOP (0.488", 12.40mm Width)
• Operating temperature range: 0°C ~ 70°C minimum support
• Access time: Equal to or faster than 90 ns
• Write cycle time: Equal to or faster than 50µs

The SST39SF010A-70-4C-WHE meets all substitution criteria. This part maintains identical memory capacity, organization, interface, voltage specifications, and package dimensions. The substitute offers improved performance characteristics with 70 ns access time and 20µs write cycle time, both superior to the original specification.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF010A-70-4C-WHE is the direct substitute for AT49F001N-90VC applications. Selection is based on the following engineering factors:

Product Status: The AT49F001N-90VC is obsolete, while SST39SF010A-70-4C-WHE maintains active production status, ensuring long-term availability and supply chain reliability.

Compliance: SST39SF010A-70-4C-WHE achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. This distinction is critical for applications subject to environmental regulations and modern procurement standards.

Performance: The substitute part delivers faster access time (70 ns vs. 90 ns) and significantly faster write cycle time (20µs vs. 50µs), providing performance improvement without functional compromise.

Electrical and Mechanical Compatibility: Both parts share identical memory capacity, organization, interface architecture, voltage specifications, temperature range, and package footprint, ensuring direct PCB compatibility and functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can SST39SF010A-70-4C-WHE replace AT49F001N-90VC in existing designs?

A: Yes. Both parts are electrically and mechanically compatible. They share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 32-TFSOP package footprint. No circuit modifications are required.

Q: What are the performance differences?

A: SST39SF010A-70-4C-WHE offers faster access time (70 ns vs. 90 ns) and faster write cycle time (20µs vs. 50µs). These improvements are backward-compatible with designs specified for the original part.

Q: Why is the original part obsolete?

A: AT49F001N-90VC is classified as obsolete by the manufacturer. SST39SF010A-70-4C-WHE maintains active production status, making it the appropriate choice for new designs and ongoing production requirements.

Q: Are there compliance differences?

A: Yes. SST39SF010A-70-4C-WHE is ROHS3 compliant, while AT49F001N-90VC is RoHS non-compliant. For applications subject to environmental regulations or modern procurement standards, the substitute part is required.

Q: Is the package footprint identical?

A: Yes. Both parts use 32-TFSOP packaging with 0.488" (12.40mm) width. PCB layout and component placement require no modification.

Q: What is the moisture sensitivity level?

A: Both parts carry MSL 3 rating (168 Hours), indicating identical moisture handling and storage requirements.