AT49F001-55JC Equivalent & Substitute Parts

Part Overview

The AT49F001-55JC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 55 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates within a 4.5V to 5.5V supply voltage range and supports 128K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	55 ns
Package / Case	32-LCC (J-Lead)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Write Cycle Time	50µs
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT49F001-55JC is determined by the following critical parameters:

Memory capacity (1Mbit), memory organization (128K x 8), and parallel interface architecture form the functional foundation for substitution eligibility. The 32-PLCC package and surface mount configuration establish physical compatibility requirements. Access time specifications and write cycle times define performance boundaries within which substitutes must operate.

The SST39VF010-70-4C-NHE qualifies as a substitute based on matching memory size, organization, interface type, and package configuration. While access time differs (70 ns versus 55 ns), this represents a relaxed timing specification acceptable for applications originally designed for the AT49F001-55JC. Supply voltage range differs between parts, requiring circuit-level verification for compatibility.

Parameter Comparison

Parameter	AT49F001-55JC	SST39VF010-70-4C-NHE
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8
Memory Interface	Parallel	Parallel
Access Time	55 ns	70 ns
Write Cycle Time	50µs	20µs
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Voltage - Supply	4.5V ~ 5.5V	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C (TC)	0°C ~ 70°C (TA)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SST39VF010-70-4C-NHE is an active product with ROHS3 compliance, addressing the obsolescence status of the AT49F001-55JC. The substitute maintains identical memory capacity, organization, and parallel interface specifications required for functional equivalence.

Supply voltage range differs significantly between the two parts. The AT49F001-55JC operates at 4.5V to 5.5V, while the SST39VF010-70-4C-NHE operates at 2.7V to 3.6V. Circuit designs must accommodate this voltage differential through appropriate power supply configuration or voltage regulation.

Access time specification relaxes from 55 ns to 70 ns in the substitute part. Applications with timing-critical read operations must confirm that the extended access time remains within system timing margins. Write cycle time improves from 50µs to 20µs, providing performance advantage in write-intensive applications.

The 32-PLCC package configuration and surface mount characteristics remain identical, enabling direct physical replacement on existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the SST39VF010-70-4C-NHE directly replace the AT49F001-55JC in existing designs?

A: Physical replacement is possible due to identical 32-PLCC packaging. Functional compatibility requires verification of access time and supply voltage requirements. The substitute operates at lower voltage (2.7V to 3.6V versus 4.5V to 5.5V) and slower access time (70 ns versus 55 ns).

Q: What is the primary reason for substitution?

A: The AT49F001-55JC is classified as obsolete. The SST39VF010-70-4C-NHE is an active product offering continued availability and ROHS3 compliance.

Q: Are the memory specifications identical?

A: Yes. Both parts provide 1Mbit capacity with 128K x 8 organization and parallel interface architecture.

Q: How do access time differences affect system performance?

A: The substitute part operates at 70 ns access time compared to 55 ns for the original. Systems must confirm that read timing margins accommodate the 15 ns increase.

Q: What supply voltage considerations apply?

A: The original part requires 4.5V to 5.5V operation. The substitute requires 2.7V to 3.6V. Circuit power supply design must be verified for compatibility with the substitute part's voltage range.

Q: Are both parts available in the same package configuration?

A: Yes. Both use 32-PLCC (J-Lead) surface mount packages with identical physical dimensions for PCB layout compatibility.

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