AT49F001-90JC Equivalent & Substitute Parts

Part Overview

The AT49F001-90JC is a 1Mbit parallel FLASH memory IC in 32-PLCC packaging manufactured by Microchip Technology. This device features a 90 ns access time and operates across the 4.5V to 5.5V supply voltage range with an operating temperature range of 0°C to 70°C. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and legacy design support.

Substiute Parts

AT49F001-90JC

Microchip TechnologyIn Stock: 1090AT49F001-90JC 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 AT49F001-90JC is determined by the following critical parameters:

• Memory capacity (1Mbit) and organization (128K x 8)
• Memory type (FLASH, non-volatile)
• Interface type (Parallel)
• Package compatibility (32-PLCC with J-Lead configuration)
• Voltage supply range (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)
• Access time equal to or faster than 90 ns
• Physical dimensions compatible with 32-PLCC footprint

The SST39SF010A-70-4C-NHE meets all substitution criteria. It maintains identical memory capacity, organization, interface type, and package configuration while providing improved performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF010A-70-4C-NHE is the qualified substitute for the AT49F001-90JC based on the following factors:

Functional equivalence is established through identical memory capacity, organization, interface type, and package configuration. The substitute device maintains full compatibility with the original part's electrical specifications, including voltage supply range and operating temperature range.

The SST39SF010A-70-4C-NHE provides performance improvements with a 70 ns access time versus the original 90 ns specification, and a 20µs write cycle time versus 50µs. These improvements ensure backward compatibility while enhancing system performance.

Product status favors the substitute. The AT49F001-90JC is obsolete, while the SST39SF010A-70-4C-NHE maintains active status with verified programmability and current inventory availability. The substitute meets ROHS3 compliance requirements, whereas the original part is non-compliant with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF010A-70-4C-NHE directly replace the AT49F001-90JC in existing designs?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, 32-PLCC package configuration, and electrical specifications (4.5V to 5.5V supply, 0°C to 70°C operating range). The substitute's faster access time and write cycle time are backward compatible with designs specified for the original part.

Q: What are the key differences between these two parts?

A: The primary differences are product status and performance. The AT49F001-90JC is obsolete with a 90 ns access time and 50µs write cycle time. The SST39SF010A-70-4C-NHE is an active product with improved performance (70 ns access time, 20µs write cycle time) and meets ROHS3 compliance standards.

Q: Are the physical packages identical?

A: Both devices use 32-PLCC (J-Lead) surface mount packages. The AT49F001-90JC package dimensions are 13.97x11.43mm, while the SST39SF010A-70-4C-NHE dimensions are 11.43x13.97mm. These represent the same package type with rotated dimensional notation and are mechanically compatible for PCB mounting.

Q: What is the impact of the faster access time on system compatibility?

A: The SST39SF010A-70-4C-NHE's 70 ns access time is faster than the original 90 ns specification. Faster access times are backward compatible with designs specified for slower devices, as timing margins increase rather than decrease.

Q: Are there any compliance considerations for substitution?

A: The SST39SF010A-70-4C-NHE meets ROHS3 compliance, whereas the AT49F001-90JC does not. For applications subject to RoHS regulations, the substitute is the appropriate choice. Both devices are REACH unaffected and carry EAR99 ECCN classification.