AT49F001-70JC Equivalent & Substitute Parts

Part Overview

The AT49F001-70JC is a 1Mbit 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 substitute parts necessary for new designs and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports 128K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT49F001-70JC

Microchip TechnologyIn Stock: 875AT49F001-70JC Datasheet

Current PartRFQ

SST39VF010-70-4C-NHE

Microchip TechnologyIn Stock: 3949SST39VF010-70-4C-NHE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT49F001-70JC is determined by the following critical parameters:

• Memory capacity (1Mbit) and organization (128K x 8) must remain identical
• Parallel memory interface is required for pin-level compatibility
• 32-PLCC package with J-Lead configuration ensures mechanical and electrical fit
• Access time of 70 ns or faster maintains timing compatibility
• Surface mount mounting type aligns with PCB assembly requirements

The SST39VF010-70-4C-NHE meets all these criteria and serves as the primary substitute. Both devices share identical memory capacity, organization, interface type, and package configuration, enabling direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

The SST39VF010-70-4C-NHE is the qualified substitute for the AT49F001-70JC based on the following factors:

• Both devices maintain identical memory capacity, organization, and parallel interface architecture
• Package compatibility is confirmed through matching 32-PLCC J-Lead configuration
• Access time specifications are equivalent at 70 ns
• The substitute part carries Active product status, ensuring long-term availability and supply chain continuity
• ROHS3 compliance of the substitute part supports modern manufacturing and environmental standards
• The substitute part is DiGi-Electronics Programmable Verified, confirming functional compatibility

Note: The substitute part operates at a lower supply voltage range (2.7V ~ 3.6V) compared to the original part (4.5V ~ 5.5V). Circuit design must accommodate this voltage differential. The substitute part also features improved write cycle time (20µs versus 50µs), providing performance enhancement.

Frequently Asked Questions (FAQ)

Q: Can the SST39VF010-70-4C-NHE directly replace the AT49F001-70JC in existing designs?

A: Direct pin-level replacement is supported due to identical package configuration (32-PLCC J-Lead), memory organization (128K x 8), and parallel interface. However, the supply voltage range difference requires circuit evaluation to confirm compatibility with existing power supply specifications.

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

A: The primary differences are supply voltage range (4.5V ~ 5.5V for AT49F001-70JC versus 2.7V ~ 3.6V for SST39VF010-70-4C-NHE), write cycle time (50µs versus 20µs), product status (Obsolete versus Active), and RoHS compliance (non-compliant versus ROHS3 compliant).

Q: Is the 32-PLCC package identical between both parts?

A: Both parts use 32-LCC (J-Lead) packaging with surface mount configuration. Physical dimensions are 13.97x11.43 mm for the original part and 11.43x13.97 mm for the substitute, representing a rotational orientation difference. PCB footprint compatibility must be verified for your specific design layout.

Q: What is the impact of the lower supply voltage range on system design?

A: The substitute part requires a 2.7V ~ 3.6V supply, which differs from the original 4.5V ~ 5.5V specification. If your system uses 5V logic, voltage regulation or level shifting may be necessary. Consult your circuit design specifications to determine compatibility.

Q: Are both parts suitable for new production designs?

A: The AT49F001-70JC is obsolete and not recommended for new designs. The SST39VF010-70-4C-NHE carries Active status and is the appropriate choice for new production, offering improved compliance and supply chain availability.