AT49F002NT-70PI Equivalent & Substitute Parts

Part Overview

The AT49F002NT-70PI is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package with 70 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

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	4.5V ~ 5.5V
Package Type	32-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 85°C (TC)

Substitute Part Grouping Explanation

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

Memory capacity: 2Mbit (256K x 8 organization)
Interface type: Parallel
Access time: 70 ns maximum
Supply voltage range: 4.5V ~ 5.5V
Package: 32-DIP form factor with 0.600" (15.24mm) body width
Mounting: Through-hole technology

The SST39SF020A-70-4C-PHE meets all electrical and mechanical substitution criteria. Both devices share identical memory specifications, voltage requirements, access time performance, and physical packaging, enabling direct functional replacement in legacy systems.

Parameter Comparison

Parameter	AT49F002NT-70PI	SST39SF020A-70-4C-PHE	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	Compatible (faster)
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Equivalent
Package Type	32-DIP (0.600", 15.24mm)	32-DIP (0.600", 15.24mm)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature	-40°C ~ 85°C (TC)	0°C ~ 70°C (TA)	Narrower range on substitute
Product Status	Obsolete	Active	Substitute is current production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current standards

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for the AT49F002NT-70PI based on the following factors:

Electrical Equivalence: Both devices provide identical 2Mbit capacity with 256K x 8 organization, parallel interface, and 70 ns access time. Supply voltage requirements are identical at 4.5V ~ 5.5V.

Physical Compatibility: Both devices use 32-DIP packaging with 0.600" body width, enabling direct socket replacement without PCB modification.

Performance Enhancement: The SST39SF020A-70-4C-PHE offers improved write cycle time (20µs versus 50µs), providing faster programming without compromising read performance.

Compliance Status: The substitute part is ROHS3 compliant and carries active product status, ensuring long-term availability and compliance with current regulatory requirements. The original AT49F002NT-70PI is obsolete and RoHS non-compliant.

Temperature Range Consideration: The substitute operates over 0°C ~ 70°C, which is narrower than the original -40°C ~ 85°C range. Verify that system operating conditions fall within the substitute's temperature specification before implementation.

Frequently Asked Questions (FAQ)

Q: Can the SST39SF020A-70-4C-PHE directly replace the AT49F002NT-70PI without PCB modifications?

A: Yes. Both devices use identical 32-DIP packaging with 0.600" body width and through-hole mounting. Pin-for-pin compatibility is maintained for all signal and power connections.

Q: Are the memory specifications identical between these parts?

A: Yes. Both devices provide 2Mbit capacity organized as 256K x 8 with parallel interface and 70 ns access time. Voltage supply requirements are identical at 4.5V ~ 5.5V.

Q: What is the difference in write cycle time, and does it affect compatibility?

A: The SST39SF020A-70-4C-PHE has a 20µs write cycle time compared to 50µs for the AT49F002NT-70PI. This represents improved performance and does not create compatibility issues; systems designed for the slower original part will function correctly with the faster substitute.

Q: Does the operating temperature range difference affect substitution?

A: The substitute operates over 0°C ~ 70°C versus the original -40°C ~ 85°C. Substitution is valid only if your system operates within the 0°C ~ 70°C range. For applications requiring -40°C or below, or above 70°C operation, the substitute is not suitable.

Q: Why is the original part obsolete?

A: The AT49F002NT-70PI is classified as obsolete by the manufacturer. The SST39SF020A-70-4C-PHE is the active production equivalent, ensuring continued availability and support.

Q: What compliance advantages does the substitute offer?

A: The SST39SF020A-70-4C-PHE is ROHS3 compliant, meeting current environmental and regulatory standards. The original AT49F002NT-70PI is RoHS non-compliant, making the substitute preferable for new designs and systems requiring regulatory compliance.

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