AT49F002NT-70JC Equivalent & Substitute Parts

Part Overview

The AT49F002NT-70JC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 70 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part operates within a 4.5V to 5.5V supply range and supports 256K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	70 ns
Write Cycle Time	50µs
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT49F002NT-70JC is determined by strict equivalence across the following critical parameters:

Memory capacity: 2Mbit
Memory organization: 256K x 8
Interface type: Parallel
Access time: 70 ns maximum
Supply voltage: 4.5V ~ 5.5V
Package: 32-PLCC (J-Lead)
Operating temperature range: 0°C ~ 70°C

The SST39SF020A-70-4C-NHE meets all these requirements and qualifies as a direct substitute. While the SST39SF020A exhibits improved write cycle time (20µs versus 50µs), this represents enhanced performance and does not compromise compatibility. Both parts maintain identical memory capacity, organization, access time, voltage specifications, and physical packaging.

Parameter Comparison

Parameter	AT49F002NT-70JC	SST39SF020A-70-4C-NHE	Compatibility
Memory Size	2Mbit	2Mbit	Equivalent
Memory Organization	256K x 8	256K x 8	Equivalent
Memory Interface	Parallel	Parallel	Equivalent
Access Time	70 ns	70 ns	Equivalent
Write Cycle Time	50µs	20µs	Substitute Superior
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Equivalent
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Equivalent
Package Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Product Status	Obsolete	Active	Substitute Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

The SST39SF020A-70-4C-NHE is the qualified substitute for AT49F002NT-70JC applications. Selection is based on the following engineering criteria:

Product Status: The AT49F002NT-70JC is obsolete, while the SST39SF020A-70-4C-NHE maintains active production status with 29,200 units in stock, ensuring supply chain continuity.

Regulatory Compliance: The SST39SF020A-70-4C-NHE is ROHS3 compliant, whereas the AT49F002NT-70JC is non-compliant. This distinction is material for applications subject to RoHS regulations.

Electrical Equivalence: Both parts share identical memory capacity, organization, access time, and voltage specifications. Pin-for-pin compatibility is maintained through identical 32-PLCC packaging.

Performance Enhancement: The SST39SF020A-70-4C-NHE provides superior write cycle time (20µs versus 50µs), representing a 2.5x improvement that does not introduce compatibility issues.

REACH Compliance: Both parts maintain REACH Unaffected status, with identical ECCN (EAR99) and HTSUS (8542.32.0071) classifications.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-NHE directly replace the AT49F002NT-70JC in existing designs?

A: Yes. Both parts are pin-compatible 32-PLCC packages with identical memory capacity (2Mbit), organization (256K x 8), access time (70 ns), and voltage specifications (4.5V ~ 5.5V). No circuit modifications are required.

Q: What is the significance of the improved write cycle time in the SST39SF020A-70-4C-NHE?

A: The SST39SF020A-70-4C-NHE reduces write cycle time from 50µs to 20µs. This represents enhanced performance and does not compromise backward compatibility. Systems designed for the original 50µs specification will operate correctly with the faster substitute.

Q: Are there packaging differences between these parts?

A: Both parts use 32-PLCC (J-Lead) surface mount packages. Physical dimensions are equivalent: AT49F002NT-70JC measures 13.97x11.43mm, while SST39SF020A-70-4C-NHE measures 11.43x13.97mm (rotated orientation). Both are functionally interchangeable in standard 32-PLCC sockets.

Q: Why is RoHS compliance relevant for this substitution?

A: The AT49F002NT-70JC is RoHS non-compliant, while the SST39SF020A-70-4C-NHE is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute part provides regulatory alignment without functional compromise.

Q: What is the inventory status for these parts?

A: The AT49F002NT-70JC has 1,956 units in stock (obsolete status). The SST39SF020A-70-4C-NHE has 29,200 units in stock with active production status, ensuring long-term availability for new designs and production runs.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate across 0°C to 70°C. The AT49F002NT-70JC specifies TC (case temperature), while the SST39SF020A-70-4C-NHE specifies TA (ambient temperature). Both maintain the same functional temperature window.

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