AT49F001N-90JC Equivalent & Substitute Parts

Part Overview

The AT49F001N-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

AT49F001N-90JC

Microchip TechnologyIn Stock: 2372AT49F001N-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 AT49F001N-90JC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 1Mbit fixed requirement
• Memory organization: 128K x 8 configuration
• Interface type: Parallel interface mandatory
• Package format: 32-PLCC (J-Lead) physical compatibility
• Supply voltage: 4.5V ~ 5.5V operating range
• Temperature range: 0°C ~ 70°C minimum specification

The SST39SF010A-70-4C-NHE meets all substitution criteria. While it offers improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), these represent performance enhancements rather than deviations from the core electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF010A-70-4C-NHE is the direct functional equivalent for AT49F001N-90JC replacement. Selection is based on the following engineering factors:

• The substitute part maintains identical memory capacity, organization, and parallel interface architecture
• Physical package compatibility is confirmed through 32-PLCC (J-Lead) specification match
• Electrical specifications align across supply voltage and operating temperature ranges
• The substitute part carries Active product status, ensuring long-term availability and supply chain continuity
• ROHS3 compliance of the substitute part addresses regulatory requirements not met by the obsolete original part
• Performance improvements in access time and write cycle time provide design margin without requiring circuit modification

Frequently Asked Questions (FAQ)

Q: Can SST39SF010A-70-4C-NHE be used as a direct replacement for AT49F001N-90JC?

A: Yes. Both parts share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, package format (32-PLCC), and electrical specifications (4.5V ~ 5.5V supply, 0°C ~ 70°C operating range). The substitute part is pin-compatible and functionally equivalent.

Q: What are the performance differences between these parts?

A: The SST39SF010A-70-4C-NHE provides faster access time (70 ns versus 90 ns) and reduced write cycle time (20µs versus 50µs). These improvements enhance system performance without requiring design changes.

Q: Are there package compatibility concerns?

A: No. Both parts use the 32-PLCC (J-Lead) package format with surface mount configuration. Physical dimensions and pin assignments are compatible.

Q: Does the substitute part meet current compliance standards?

A: The SST39SF010A-70-4C-NHE is ROHS3 compliant, addressing modern regulatory requirements. The original AT49F001N-90JC is RoHS non-compliant.

Q: What is the availability status of each part?

A: The AT49F001N-90JC is obsolete with limited inventory. The SST39SF010A-70-4C-NHE is active production with established supply chain availability.