AT49F002-55JC Equivalent & Substitute Parts

Part Overview

The AT49F002-55JC is a 2Mbit parallel FLASH memory IC in 32-PLCC packaging manufactured by Microchip Technology. This device features a 55 ns access time and operates across the 4.5V to 5.5V supply voltage range with a 0°C to 70°C temperature specification. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations where this memory capacity and interface type are required.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Format	FLASH
Memory Interface	Parallel
Access Time	55 ns
Package / Case	32-LCC (J-Lead)
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Write Cycle Time - Word, Page	50µs

Substitute Part Grouping Explanation

Substitution of the AT49F002-55JC is determined by the following critical parameters that must remain consistent:

Memory capacity: 2Mbit (256K x 8 organization)
Memory type: FLASH non-volatile
Interface: Parallel
Package: 32-LCC (J-Lead) surface mount
Supply voltage range: 4.5V ~ 5.5V
Operating temperature range: 0°C ~ 70°C

The SST39SF020A-70-4C-NHE qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. While the access time specification differs (70 ns versus 55 ns), this represents a relaxed timing requirement that is compatible with systems designed for the original part. The write cycle time improvement (20µs versus 50µs) provides enhanced performance characteristics.

Parameter Comparison

Parameter	AT49F002-55JC	SST39SF020A-70-4C-NHE
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Format	FLASH	FLASH
Memory Interface	Parallel	Parallel
Access Time	55 ns	70 ns
Write Cycle Time - Word, Page	50µs	20µs
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)
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 AT49F002-55JC. Selection of this substitute is supported by the following factors:

The original AT49F002-55JC is classified as obsolete, eliminating its availability for new procurement. The SST39SF020A-70-4C-NHE maintains active product status with substantial inventory availability (29,200 pcs), ensuring supply chain continuity.

Both devices share identical memory capacity, organization, interface type, and packaging specifications. The electrical operating parameters—supply voltage range and temperature range—are fully compatible.

The SST39SF020A-70-4C-NHE provides improved RoHS compliance status (ROHS3 Compliant versus RoHS non-compliant), supporting modern manufacturing and environmental regulatory requirements. The substitute also demonstrates superior write cycle time performance (20µs versus 50µs), delivering enhanced operational efficiency.

The access time specification of the substitute (70 ns) is relaxed relative to the original part (55 ns). This timing difference is acceptable for systems originally designed around the AT49F002-55JC, as the substitute meets the functional requirements of parallel FLASH memory access within the same voltage and temperature operating envelope.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-NHE directly replace the AT49F002-55JC in existing designs?

A: Yes. Both devices share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, 32-LCC package, supply voltage range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). The substitute is mechanically and electrically compatible for direct socket replacement.

Q: What is the significance of the access time difference (55 ns versus 70 ns)?

A: The SST39SF020A-70-4C-NHE has a relaxed access time specification. Systems designed for the 55 ns AT49F002-55JC will operate correctly with the 70 ns substitute, as the slower access time does not introduce functional incompatibility. The substitute meets the memory interface requirements of the original design.

Q: Are there any compliance differences between these parts?

A: Yes. The SST39SF020A-70-4C-NHE is ROHS3 Compliant, while the AT49F002-55JC is RoHS non-compliant. For applications subject to RoHS regulations, the substitute provides improved compliance status. Both parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: What is the packaging difference between the two parts?

A: Both parts use 32-LCC (J-Lead) surface mount packaging. The physical dimensions differ slightly (AT49F002-55JC: 13.97x11.43 mm; SST39SF020A-70-4C-NHE: 11.43x13.97 mm), but both conform to the same 32-PLCC standard and are compatible with identical PCB footprints.

Q: Does the write cycle time improvement affect system compatibility?

A: No. The SST39SF020A-70-4C-NHE provides faster write cycle time (20µs versus 50µs), which represents improved performance. Systems designed for the original 50µs specification will operate correctly with the faster substitute without requiring design modifications.

Q: What is the product status difference, and why does it matter?

A: The AT49F002-55JC is obsolete and no longer manufactured. The SST39SF020A-70-4C-NHE is active production with 29,200 pcs in stock, ensuring availability for current and future procurement needs.

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