AT49F002T-90PC Equivalent & Substitute Parts

Part Overview

The AT49F002T-90PC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PDIP package with 90 ns access time. This device is classified as obsolete and is no longer in active production. Finding equivalent substitute parts is necessary due to the discontinued status of this component, which may impact long-term availability for new designs, production runs, or system maintenance requiring component replacement.

Substiute Parts

AT49F002T-90PC

Microchip TechnologyIn Stock: 903AT49F002T-90PC 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 AT49F002T-90PC is determined by the following critical parameters:

• Memory Capacity & Organization: Substitute parts must provide 2Mbit capacity in 256K x 8 organization to maintain functional equivalence
• Memory Interface: Parallel interface is required for pin-compatible operation
• Package Compatibility: 32-DIP (0.600", 15.24mm) package ensures mechanical and electrical pin compatibility
• Voltage Supply Range: 4.5V ~ 5.5V operating range must be maintained
• Operating Temperature Range: 0°C ~ 70°C compatibility ensures thermal envelope compatibility
• Mounting Type: Through-hole mounting type must be preserved for PCB assembly compatibility

The SST39SF020A-70-4C-PHE meets all substitution criteria and is classified as an active product with improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SST39SF020A-70-4C-PHE is the qualified substitute for the AT49F002T-90PC based on the following engineering criteria:

• Functional Compatibility: Both devices share identical memory capacity, organization, interface type, and package configuration, ensuring direct pin-for-pin compatibility
• Product Status: The substitute is an active product with ongoing manufacturing support, addressing the obsolescence of the original part
• Compliance Status: The SST39SF020A-70-4C-PHE is ROHS3 compliant, whereas the AT49F002T-90PC is non-compliant, providing improved environmental and regulatory alignment for new designs
• Performance Enhancement: The substitute offers improved access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs), providing performance benefits without functional compromise
• Supply Availability: The substitute maintains higher inventory levels, supporting production continuity and component availability

Frequently Asked Questions (FAQ)

Q: Is the SST39SF020A-70-4C-PHE a direct pin-for-pin replacement for the AT49F002T-90PC?

A: Yes. Both devices use the 32-DIP (0.600", 15.24mm) package with identical pin assignments for parallel FLASH memory operation. No PCB modifications are required for substitution.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete versus active), access time (90 ns versus 70 ns), write cycle time (50µs versus 20µs), and RoHS compliance status (non-compliant versus ROHS3 compliant). Functionally, both devices provide 2Mbit parallel FLASH memory in 256K x 8 organization.

Q: Can the SST39SF020A-70-4C-PHE be used in existing designs using the AT49F002T-90PC?

A: Yes. The substitute meets all critical substitution parameters: identical memory capacity, organization, interface, package, voltage supply range, and operating temperature range. The improved performance characteristics of the substitute do not introduce compatibility issues.

Q: Does the faster access time of the SST39SF020A-70-4C-PHE affect system compatibility?

A: No. Faster access time is a performance enhancement that does not create compatibility issues. Systems designed for 90 ns access time will operate correctly with a 70 ns device.

Q: What is the significance of the RoHS compliance difference?

A: The SST39SF020A-70-4C-PHE is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components. The AT49F002T-90PC is non-compliant. For new designs or systems subject to RoHS regulations, the substitute is the appropriate choice.

Q: Are both parts available from the same manufacturer?

A: Yes. Both the AT49F002T-90PC and SST39SF020A-70-4C-PHE are manufactured by Microchip Technology, ensuring consistent quality and support standards.