AT49F001N-55JC Equivalent & Substitute Parts

Part Overview

The AT49F001N-55JC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 55 ns access time. This device is classified as obsolete and is no longer in active production. Finding equivalent or substitute parts is necessary due to discontinued status and limited remaining inventory. The SST39VF010-70-4C-NHE serves as a functional alternative for applications requiring 1Mbit parallel FLASH memory in the same package footprint.

Substiute Parts

AT49F001N-55JC

Microchip TechnologyIn Stock: 1135AT49F001N-55JC Datasheet

Current PartRFQ

SST39VF010-70-4C-NHE

Microchip TechnologyIn Stock: 3949SST39VF010-70-4C-NHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F001N-55JC is determined by the following critical parameters:

• Memory capacity: 1Mbit (128K x 8 organization)
• Interface type: Parallel
• Package type: 32-PLCC (J-Lead)
• Pin compatibility: Same pinout required for direct replacement
• Supply voltage range: Must accommodate system voltage requirements
• Access time: Substitute must meet or exceed performance specifications

The SST39VF010-70-4C-NHE meets these substitution criteria. Both devices share identical memory capacity, organization, parallel interface, and package form factor. The substitute operates at a different supply voltage range (2.7V ~ 3.6V versus 4.5V ~ 5.5V) and has a slower access time (70 ns versus 55 ns), which must be evaluated for system compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SST39VF010-70-4C-NHE is the designated substitute for the AT49F001N-55JC based on the following factors:

• Both devices are manufactured by Microchip Technology and share identical memory specifications and package form factor
• The substitute is in active production status, ensuring long-term availability and supply chain continuity
• The substitute achieves ROHS3 compliance, whereas the original part is RoHS non-compliant
• Access time difference (70 ns versus 55 ns) must be validated against system timing requirements
• Supply voltage range differs significantly (2.7V ~ 3.6V versus 4.5V ~ 5.5V); system voltage compatibility must be confirmed before implementation
• Write cycle time is improved in the substitute (20µs versus 50µs)

Frequently Asked Questions (FAQ)

Q: Can the SST39VF010-70-4C-NHE be used as a direct pin-for-pin replacement?

A: Both devices use the 32-PLCC package with J-Lead configuration. Pin compatibility is maintained for direct replacement. However, supply voltage range differences require circuit evaluation to ensure system compatibility.

Q: What is the impact of the 15 ns access time difference?

A: The substitute has a 70 ns access time compared to the original 55 ns. Systems designed with timing margins may accommodate this difference. Applications with strict timing requirements must validate performance with the slower access time.

Q: Are there voltage compatibility concerns?

A: The original part operates at 4.5V ~ 5.5V, while the substitute operates at 2.7V ~ 3.6V. These voltage ranges do not overlap. System power supply voltage must be compatible with the substitute's operating range.

Q: What is the difference in write cycle time?

A: The substitute offers improved write performance at 20µs compared to the original 50µs. This faster write cycle time does not create compatibility issues and may improve overall system performance.

Q: Does the substitute meet current compliance standards?

A: The SST39VF010-70-4C-NHE is ROHS3 compliant, whereas the original AT49F001N-55JC is RoHS non-compliant. The substitute meets current environmental and regulatory requirements.

Q: What is the moisture sensitivity difference?

A: The original part has MSL 2 (1 Year), while the substitute has MSL 3 (168 Hours). The substitute requires more careful handling during storage and assembly to prevent moisture absorption.