AT49F001T-90JC Equivalent & Substitute Parts

Part Overview

The AT49F001T-90JC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 90 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 range and supports 128K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F001T-90JC

Microchip TechnologyIn Stock: 1036AT49F001T-90JC Datasheet

Current PartRFQ

SST39SF010A-70-4C-NHE

Microchip TechnologyIn Stock: 3345SST39SF010A-70-4C-NHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F001T-90JC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 1Mbit (128K x 8 organization)
• Interface type: Parallel
• Package format: 32-PLCC (J-Lead)
• Supply voltage: 4.5V ~ 5.5V compatibility
• Operating temperature range: 0°C ~ 70°C
• Mounting technology: Surface Mount

The SST39SF010A-70-4C-NHE meets all substitution criteria. While it offers improved performance characteristics (70 ns access time versus 90 ns, 20µs write cycle versus 50µs), these enhancements are backward-compatible with the original part's electrical and mechanical specifications. The substitute maintains identical memory capacity, organization, interface, package, voltage range, and temperature rating.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF010A-70-4C-NHE is the direct substitute for AT49F001T-90JC applications. Selection is based on the following engineering factors:

Product Status: The AT49F001T-90JC is obsolete, while SST39SF010A-70-4C-NHE is active, ensuring long-term availability and supply chain continuity.

Compliance: SST39SF010A-70-4C-NHE achieves ROHS3 compliance, whereas AT49F001T-90JC is non-compliant. This distinction is relevant for applications subject to RoHS regulations.

Performance Compatibility: The substitute part delivers faster access time (70 ns versus 90 ns) and reduced write cycle time (20µs versus 50µs). These improvements are fully backward-compatible with designs specified for the original part.

Electrical and Mechanical Equivalence: Both parts share identical memory capacity, organization, interface architecture, package format, voltage specifications, and temperature rating, enabling direct pin-for-pin replacement.

Frequently Asked Questions (FAQ)

Q: Can SST39SF010A-70-4C-NHE replace AT49F001T-90JC in existing designs?

A: Yes. The substitute part maintains identical memory capacity (1Mbit), organization (128K x 8), parallel interface, 32-PLCC package, 4.5V–5.5V supply voltage, and 0°C–70°C operating temperature range. Pin-for-pin replacement is supported.

Q: What are the performance differences between these parts?

A: SST39SF010A-70-4C-NHE offers faster access time (70 ns versus 90 ns) and shorter write cycle time (20µs versus 50µs). These improvements do not affect compatibility with designs specified for the original 90 ns part.

Q: Are the packages physically identical?

A: Both parts use 32-PLCC (J-Lead) surface mount packages. Physical dimensions are equivalent: AT49F001T-90JC is 13.97x11.43 mm, and SST39SF010A-70-4C-NHE is 11.43x13.97 mm (rotated orientation, same footprint area). PCB layout compatibility is maintained.

Q: What is the difference in RoHS compliance?

A: AT49F001T-90JC is RoHS non-compliant. SST39SF010A-70-4C-NHE is ROHS3 compliant. For applications requiring RoHS certification, the substitute part satisfies regulatory requirements.

Q: Are there differences in moisture sensitivity?

A: AT49F001T-90JC has MSL 2 (1 Year). SST39SF010A-70-4C-NHE has MSL 3 (168 Hours). Both ratings are within standard handling and storage protocols for surface mount components.

Q: Is the substitute part programmable?

A: SST39SF010A-70-4C-NHE is verified as programmable. AT49F001T-90JC programmability is not verified in available documentation.