AT49F001NT-90VC Equivalent & Substitute Parts

Part Overview

The AT49F001NT-90VC is a 1Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-VSOP package with 90 ns access time. This device is classified as obsolete, making substitute components necessary for new designs and production continuity. The part operates within the 4.5V to 5.5V supply 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	90 ns
Write Cycle Time	50µs
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-TFSOP (0.488", 12.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT49F001NT-90VC is determined by strict equivalence across the following parameters:

Memory capacity: 1Mbit (128K x 8 organization)
Interface type: Parallel
Package footprint: 32-TFSOP with 0.488" width and 12.40mm width specification
Supply voltage compatibility: 4.5V ~ 5.5V range
Operating temperature range: 0°C ~ 70°C minimum

The SST39SF010A-70-4C-WHE qualifies as a direct substitute based on matching memory size, organization, parallel interface, identical package dimensions, and overlapping voltage and temperature specifications. Access time improvement (70 ns versus 90 ns) and write cycle time reduction (20µs versus 50µs) represent performance enhancements that maintain backward compatibility.

Parameter Comparison

Parameter	AT49F001NT-90VC	SST39SF010A-70-4C-WHE
Memory Size	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8
Memory Interface	Parallel	Parallel
Access Time	90 ns	70 ns
Write Cycle Time	50µs	20µs
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	32-TFSOP	32-TFSOP
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SST39SF010A-70-4C-WHE is the qualified substitute for AT49F001NT-90VC applications. Selection is based on:

Active product status ensures long-term availability and manufacturing support
ROHS3 compliance satisfies current regulatory requirements for new designs
Identical memory capacity and organization guarantee functional equivalence
Matching package footprint and mounting type enable direct PCB compatibility
Improved access time and write cycle time provide performance margin without requiring design modification
Maintained voltage and temperature specifications ensure operation within existing system parameters

Frequently Asked Questions (FAQ)

Q: Can SST39SF010A-70-4C-WHE replace AT49F001NT-90VC in existing designs?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, 32-TFSOP package footprint, and voltage/temperature operating ranges. The substitute offers faster access time (70 ns vs 90 ns) and reduced write cycle time (20µs vs 50µs), maintaining backward compatibility.

Q: What is the primary reason for substitution?

A: AT49F001NT-90VC is classified as obsolete. SST39SF010A-70-4C-WHE is an active product with ongoing manufacturing support and availability.

Q: Are there package compatibility concerns?

A: No. Both devices use 32-TFSOP packaging with identical 0.488" width and 12.40mm width specifications, enabling direct PCB footprint compatibility without layout modifications.

Q: Does the substitute meet current compliance standards?

A: Yes. SST39SF010A-70-4C-WHE is ROHS3 compliant and REACH unaffected, satisfying current regulatory requirements for new production.

Q: Will the improved access time affect system operation?

A: No. The substitute's faster access time (70 ns) is a performance enhancement that maintains compatibility with designs specified for 90 ns operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message