AT49F002-90JC Equivalent & Substitute Parts

Part Overview

The AT49F002-90JC is a 2Mbit 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 substitute parts necessary for new designs and production continuity. The part operates within the 4.5V to 5.5V supply range and is suitable for applications requiring non-volatile parallel memory storage.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	90 ns
Package / Case	32-LCC (J-Lead)
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT49F002-90JC is determined by the following critical parameters:

Memory capacity (2Mbit) and organization (256K x 8)
Parallel memory interface
32-PLCC package compatibility
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)

The SST39SF020A-70-4C-NHE meets all these requirements. 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 incompatibilities. The substitute maintains identical memory capacity, organization, interface type, package form factor, and voltage specifications.

Parameter Comparison

Parameter	AT49F002-90JC	SST39SF020A-70-4C-NHE
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Interface	Parallel	Parallel
Access Time	90 ns	70 ns
Write Cycle Time - Word, Page	50µs	20µs
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TC)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SST39SF020A-70-4C-NHE is the qualified substitute for the AT49F002-90JC. Selection is based on the following factors:

The substitute maintains full electrical and mechanical compatibility across all critical parameters
The substitute is in active production status, ensuring supply chain continuity
The substitute achieves ROHS3 compliance, whereas the original part is non-compliant
Performance improvements (faster access time and write cycle time) provide design margin without introducing incompatibility
Both parts carry identical REACH and ECCN classifications

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-NHE be used as a direct replacement for the AT49F002-90JC?

A: Yes. Both devices share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, 32-PLCC package, and supply voltage specifications (4.5V ~ 5.5V). The substitute offers faster performance characteristics without introducing electrical or mechanical incompatibilities.

Q: What are the differences between these two parts?

A: The primary differences are access time (70 ns versus 90 ns), write cycle time (20µs versus 50µs), product status (active versus obsolete), and RoHS compliance (ROHS3 versus non-compliant). The substitute provides performance improvements and regulatory compliance.

Q: Are the packages physically identical?

A: Both parts use the 32-LCC (J-Lead) package form factor. Physical dimensions are compatible for PCB mounting and socket applications.

Q: What is the supply voltage requirement for both parts?

A: Both the AT49F002-90JC and SST39SF020A-70-4C-NHE operate within the 4.5V to 5.5V supply voltage range.

Q: Is the SST39SF020A-70-4C-NHE available in production quantities?

A: Yes. The substitute part is in active production status with documented inventory availability.

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