AT49F002NT-12TC Equivalent & Substitute Parts

Part Overview

The AT49F002NT-12TC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-TSOP package with 120 ns access time. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production support. The part operates within a 4.5V to 5.5V supply voltage range and supports 0°C to 70°C operating temperatures, typical for industrial and embedded applications requiring non-volatile memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile FLASH
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	120 ns
Write Cycle Time	50µs
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-TSOP
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution for the AT49F002NT-12TC is based on the following critical parameters:

Memory Interface: Parallel interface compatibility
Voltage Supply Range: 4.5V ~ 5.5V operation
Package Type: 32-pin surface mount configuration
Pin Count and Pinout: 32-pin arrangement for PCB compatibility
Access Time: Performance specification for timing-critical applications
Product Status: Active availability for production use

The identified substitute IS61C5128AS-25QLI meets the parallel interface and voltage supply requirements. However, this substitute represents a functional alternative rather than a pin-for-pin replacement, as it differs in memory type (SRAM vs. FLASH), memory capacity (4Mbit vs. 2Mbit), and access time (25 ns vs. 120 ns). Selection depends on application requirements regarding data persistence and performance specifications.

Parameter Comparison

Parameter	AT49F002NT-12TC (Main Part)	IS61C5128AS-25QLI (Substitute)
Manufacturer	Microchip Technology	ISSI (Integrated Silicon Solution Inc)
Memory Type	Non-Volatile FLASH	Volatile SRAM
Memory Size	2Mbit	4Mbit
Memory Organization	256K x 8	512K x 8
Memory Interface	Parallel	Parallel
Access Time	120 ns	25 ns
Write Cycle Time	50µs	25 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	32-TSOP	32-SOIC
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT49F002NT-12TC is obsolete and no longer in active production. The IS61C5128AS-25QLI is actively manufactured and ROHS3 compliant, making it suitable for new designs requiring regulatory compliance.

Selection between these components must account for fundamental functional differences:

Non-Volatile vs. Volatile Storage: The original part retains data without power; the substitute requires continuous power supply. Applications requiring data persistence after power loss cannot use SRAM substitutes without additional battery-backed or external storage provisions.
Access Time Performance: The substitute provides faster access (25 ns vs. 120 ns), which may benefit timing-critical applications but is not a limiting factor for slower legacy systems.
Package Compatibility: The original uses 32-TSOP packaging while the substitute uses 32-SOIC. Physical board layout modifications are required; pin assignments must be verified against application schematics.
Compliance Requirements: For applications subject to RoHS regulations, the substitute's ROHS3 compliance status provides regulatory advantage over the non-compliant original part.

Frequently Asked Questions (FAQ)

Q: Can IS61C5128AS-25QLI be used as a direct replacement for AT49F002NT-12TC?

A: No. While both are 32-pin parallel memory devices with compatible voltage supplies, they differ in memory type (SRAM vs. FLASH), capacity, and package form factor. Direct substitution requires circuit redesign to accommodate SRAM volatility and package differences.

Q: What is the primary limitation of using SRAM as a substitute for FLASH memory?

A: SRAM is volatile memory, meaning stored data is lost when power is removed. FLASH memory is non-volatile and retains data indefinitely without power. Applications requiring data persistence must implement alternative storage or power backup solutions.

Q: Are the packages physically compatible?

A: No. AT49F002NT-12TC uses 32-TSOP packaging (0.724" width) while IS61C5128AS-25QLI uses 32-SOIC packaging (0.445" width). PCB layout modifications are necessary for physical mounting.

Q: Does the faster access time of the substitute create compatibility issues?

A: No. The substitute's 25 ns access time is faster than the original's 120 ns specification. Systems designed for 120 ns access will operate correctly with faster components, though timing-dependent circuits should be re-evaluated.

Q: What compliance advantages does the substitute offer?

A: IS61C5128AS-25QLI is ROHS3 compliant, whereas AT49F002NT-12TC is non-compliant. For applications subject to RoHS regulations, the substitute meets current environmental and material restriction requirements.

Q: Can pinout differences be resolved through adapter boards?

A: Adapter solutions are possible but require custom design. Pinout verification against both datasheets and application schematics is mandatory before implementation.

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