AT49F001T-70JC Equivalent & Substitute Parts

Part Overview

The AT49F001T-70JC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 70 ns access time. This device is classified as obsolete, making substitute components necessary for new designs and production continuity. The part operates across a 4.5V to 5.5V supply range and supports 128K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F001T-70JC

Microchip TechnologyIn Stock: 819AT49F001T-70JC Datasheet

Current PartRFQ

SST39VF010-70-4C-NHE

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SST39VF010-70-4C-NHE qualifies as a functional substitute based on the following critical parameters:

• Memory capacity matches at 1Mbit with identical 128K x 8 organization
• Parallel memory interface architecture is identical
• Access time specification is equivalent at 70 ns
• Package type is identical: 32-PLCC (J-Lead) surface mount configuration
• Operating temperature range encompasses the original specification (0°C ~ 70°C)

Substitution is valid where the supply voltage range of the substitute (2.7V ~ 3.6V) is compatible with the system design. The substitute operates at lower voltage levels, which may require circuit evaluation in applications originally designed for 4.5V ~ 5.5V operation.

Parameter Comparison

Engineering Selection Recommendations

The SST39VF010-70-4C-NHE is the qualified substitute for the AT49F001T-70JC based on functional equivalence in memory capacity, organization, interface type, and package configuration. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete classification of the original part.

The substitute achieves ROHS3 compliance, whereas the original part is non-compliant. This distinction is significant for applications subject to environmental regulations. The substitute also demonstrates faster write cycle performance (20µs versus 50µs), which represents an operational improvement.

Supply voltage compatibility requires evaluation. The substitute operates at 2.7V ~ 3.6V, which does not overlap with the original 4.5V ~ 5.5V specification. Circuit redesign or voltage regulation modifications may be necessary to accommodate this substitute in systems originally specified for 5V operation.

Frequently Asked Questions (FAQ)

Q: Can the SST39VF010-70-4C-NHE directly replace the AT49F001T-70JC without circuit modifications?

A: Direct pin-compatible replacement is possible due to identical package type (32-PLCC) and pinout. However, the supply voltage range difference (2.7V ~ 3.6V versus 4.5V ~ 5.5V) requires circuit evaluation. Systems designed for 5V operation must incorporate voltage regulation or redesign to operate at the substitute's specified voltage range.

Q: What are the key parameters that determine substitution eligibility?

A: Memory capacity (1Mbit), memory organization (128K x 8), parallel interface architecture, access time (70 ns), and package type (32-PLCC J-Lead) are the primary parameters establishing substitution validity. Operating temperature range and supply voltage compatibility must be verified for specific applications.

Q: Why is the substitute part classified as Active while the original is Obsolete?

A: Product status reflects manufacturer support and availability. The Active status of the substitute ensures continued manufacturing, technical support, and supply chain availability. The Obsolete status of the original part indicates discontinued production and limited future availability.

Q: Does the faster write cycle time of the substitute affect compatibility?

A: The substitute's write cycle time of 20µs is faster than the original 50µs specification. This represents an operational improvement and does not create compatibility issues. Systems designed for the original 50µs specification will function correctly with the faster substitute.

Q: What is the significance of RoHS compliance differences?

A: The substitute achieves ROHS3 compliance while the original is non-compliant. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, the substitute provides regulatory alignment. Non-regulated applications may use either part based on availability and supply considerations.