AT49F002NT-90PI Equivalent & Substitute Parts

Part Overview

The AT49F002NT-90PI is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package. This device operates with a 90 ns access time and is designed for non-volatile memory applications requiring parallel interface connectivity. The part is classified as obsolete, making identification of compatible substitute components essential for system maintenance, repair, and legacy product support.

Substiute Parts

AT49F002NT-90PI

Microchip TechnologyIn Stock: 730AT49F002NT-90PI Datasheet

Current PartRFQ

SST39SF020A-70-4C-PHE

Microchip TechnologyIn Stock: 1837SST39SF020A-70-4C-PHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F002NT-90PI is determined by strict equivalence across the following parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface type: Parallel
• Package format: 32-DIP (0.600", 15.24mm)
• Supply voltage: 4.5V ~ 5.5V compatibility
• Mounting technology: Through Hole

The SST39SF020A-70-4C-PHE meets all substitution criteria. While it features improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), these represent performance enhancements rather than incompatibilities. Both devices share identical memory capacity, organization, interface protocol, package dimensions, voltage specifications, and mounting methodology.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for AT49F002NT-90PI applications. Selection is based on the following factors:

• Both devices are manufactured by Microchip Technology, ensuring design continuity and reliability
• Electrical specifications are fully compatible across all critical parameters
• Package and pinout are identical, enabling direct socket replacement
• The substitute device is in active production status, ensuring long-term availability
• The substitute achieves ROHS3 compliance, whereas the original part is non-compliant
• Performance improvements in access time and write cycle time provide operational benefits without introducing compatibility issues

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A-70-4C-PHE directly replace AT49F002NT-90PI in existing designs?

A: Yes. Both devices share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, 32-DIP package dimensions, voltage specifications (4.5V ~ 5.5V), and through-hole mounting. Direct socket replacement is supported.

Q: What are the performance differences between these parts?

A: The SST39SF020A-70-4C-PHE offers faster access time (70 ns versus 90 ns) and reduced write cycle time (20µs versus 50µs). These represent performance enhancements and do not create compatibility constraints.

Q: Are there temperature range differences?

A: Yes. The AT49F002NT-90PI operates from -40°C to 85°C (TC), while the SST39SF020A-70-4C-PHE operates from 0°C to 70°C (TA). Applications requiring extended low-temperature operation below 0°C must retain the original part.

Q: What is the significance of RoHS compliance differences?

A: The original AT49F002NT-90PI is RoHS non-compliant, while the substitute SST39SF020A-70-4C-PHE is ROHS3 compliant. For applications subject to RoHS regulations or environmental standards, the substitute part is preferred.

Q: Are both parts available for procurement?

A: The AT49F002NT-90PI is obsolete. The SST39SF020A-70-4C-PHE is in active production status, ensuring availability for new designs and legacy system support.