AT49F002-70JC Equivalent & Substitute Parts

Part Overview

The AT49F002-70JC is a 2Mbit 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 equivalent substitute parts necessary for ongoing system support and new design implementations. 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
Voltage Supply Range	4.5V ~ 5.5V
Package Type	32-PLCC (J-Lead)
Operating Temperature	0°C ~ 70°C
Memory Type	Non-Volatile FLASH

Substitute Part Grouping Explanation

Substitution of the AT49F002-70JC is determined by strict equivalence across the following critical parameters:

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

The SST39SF020A-70-4C-NHE meets all these requirements and qualifies as a direct functional equivalent. Both devices share identical memory capacity, organization, interface architecture, and electrical specifications. Package dimensions are equivalent within manufacturing tolerances (13.97x11.43 mm vs. 11.43x13.97 mm).

Parameter Comparison

Parameter	AT49F002-70JC	SST39SF020A-70-4C-NHE	Match Status
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
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Equivalent
Operating Temperature	0°C ~ 70°C (TC)	0°C ~ 70°C (TA)	Equivalent
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)	Equivalent
Write Cycle Time	50µs	20µs	Substitute Superior
Product Status	Obsolete	Active	Substitute Current
RoHS Compliance	Non-compliant	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

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

Functional Equivalence: Both devices provide identical memory capacity, organization, and interface specifications. Pin-to-pin compatibility is maintained within the 32-PLCC package standard.

Product Status: The AT49F002-70JC is obsolete, while SST39SF020A-70-4C-NHE maintains active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: SST39SF020A-70-4C-NHE achieves ROHS3 compliance, whereas AT49F002-70JC is non-compliant. This distinction is material for applications subject to RoHS regulations.

Performance Enhancement: The substitute part delivers improved write cycle time (20µs versus 50µs), providing performance advantage without compromising electrical or mechanical compatibility.

Inventory Availability: SST39SF020A-70-4C-NHE maintains significantly higher stock levels (29,200 pcs) compared to AT49F002-70JC (1,845 pcs), supporting both immediate procurement and long-term supply requirements.

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices are functionally equivalent across all critical parameters: 2Mbit capacity, 256K x 8 organization, parallel interface, 70 ns access time, 4.5V–5.5V supply range, and 32-PLCC packaging. No circuit modifications are required.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and write cycle time (50µs vs. 20µs). The substitute offers improved performance and regulatory compliance.

Q: Are the package dimensions identical?

A: Package dimensions are equivalent within manufacturing tolerances. Both use 32-PLCC (J-Lead) form factor with dimensions of 13.97x11.43 mm and 11.43x13.97 mm respectively, representing standard dimensional variation within the PLCC specification.

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

A: No. Faster write cycle time is a performance enhancement that does not compromise compatibility. Systems designed for the original 50µs specification will operate correctly with the 20µs substitute.

Q: What is the moisture sensitivity level difference?

A: AT49F002-70JC specifies MSL 2 (1 Year), while SST39SF020A-70-4C-NHE specifies MSL 3 (168 Hours). Both are within acceptable handling and storage parameters for standard manufacturing environments.

Q: Is supply voltage compatibility guaranteed?

A: Yes. Both devices operate within the identical 4.5V to 5.5V supply range and are fully compatible with existing power distribution circuits.

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