AT49F001T-90VC Equivalent & Substitute Parts

Part Overview

The AT49F001T-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 substitute parts necessary for new designs 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

AT49F001T-90VC

Microchip TechnologyIn Stock: 1043AT49F001T-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 AT49F001T-90VC is determined by strict equivalence across the following parameters:

• Memory capacity: 1Mbit (128K x 8 organization)
• Interface type: Parallel
• Package footprint: 32-TFSOP with 0.488" width and 12.40mm width dimensions
• Supply voltage compatibility: 4.5V ~ 5.5V range
• Operating temperature range: 0°C ~ 70°C minimum
• Surface mount technology

The SST39SF010A-70-4C-WHE meets all substitution criteria. While it features improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), these represent performance enhancements rather than incompatibilities. Both devices maintain identical memory capacity, organization, interface architecture, and physical package specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF010A-70-4C-WHE is the direct functional equivalent for AT49F001T-90VC replacement. Selection is based on the following engineering criteria:

Product Status: The AT49F001T-90VC is obsolete, while SST39SF010A-70-4C-WHE maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance: SST39SF010A-70-4C-WHE achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. Both devices maintain REACH Unaffected status and EAR99 ECCN classification.

Performance Characteristics: The substitute part delivers faster access time (70 ns) and reduced write cycle time (20µs), providing performance improvement without introducing incompatibility. Identical memory capacity, organization, and interface specifications ensure direct functional replacement.

Package Compatibility: Both devices utilize identical 32-TFSOP surface mount packaging with matching footprint dimensions, enabling direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can SST39SF010A-70-4C-WHE directly replace AT49F001T-90VC on existing PCBs?

A: Yes. Both devices share identical 32-TFSOP package footprints with matching pin configurations, memory organization (128K x 8), and parallel interface architecture. No PCB modifications are required.

Q: What are the performance differences between these parts?

A: SST39SF010A-70-4C-WHE provides faster access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs). These represent performance enhancements that do not create compatibility issues in applications designed for the original part.

Q: Are the supply voltage requirements identical?

A: Yes. Both parts operate within the 4.5V to 5.5V supply range and maintain identical operating temperature specifications (0°C to 70°C).

Q: What is the significance of the RoHS compliance difference?

A: SST39SF010A-70-4C-WHE is ROHS3 compliant, meeting current environmental and regulatory requirements for new designs. The original AT49F001T-90VC is RoHS non-compliant, which may restrict its use in applications subject to RoHS regulations.

Q: Are there differences in moisture sensitivity?

A: Both devices carry identical Moisture Sensitivity Level (MSL) ratings of 3 (168 Hours), requiring equivalent handling and storage protocols.

Q: What packaging options are available for the substitute part?

A: SST39SF010A-70-4C-WHE is supplied in Tray packaging. The original part does not specify packaging format in the provided data.