AT49BV002N-90VC Equivalent & Substitute Parts

Part Overview

The AT49BV002N-90VC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, packaged in 32-VSOP with 90 ns access time. This device is classified as obsolete, making substitute parts necessary for new designs and ongoing production support. The AT49BV002N-90VC operates within a 2.7V to 3.6V supply range and is designed for applications requiring non-volatile parallel memory storage with standard industrial temperature operation (0°C to 70°C).

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	90 ns
Write Cycle Time	50µs
Voltage Supply Range	2.7V ~ 3.6V
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 AT49BV002N-90VC is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 2Mbit (256K x 8 organization)
Memory Interface: Parallel
Package Type: 32-TFSOP (0.488", 12.40mm Width)
Mounting Type: Surface Mount

Performance Parameters:

Access Time: 90 ns or faster
Write Cycle Time: 50µs or faster

Electrical Parameters:

Voltage Supply Range: Must accommodate 2.7V ~ 3.6V operation or higher voltage ranges compatible with system design

Environmental Parameters:

Operating Temperature: 0°C ~ 70°C minimum requirement

The substitute parts listed are all SST39SF020A variants from the SST39 MPF™ series. These devices maintain identical memory capacity, organization, parallel interface, and package footprint. The SST39SF020A series offers improved performance characteristics (55 ns or 70 ns access time, 20µs write cycle time) and active product status, making them direct functional replacements. Voltage supply differences (4.5V ~ 5.5V for SST39SF020A versus 2.7V ~ 3.6V for AT49BV002N-90VC) require system-level evaluation for compatibility.

Parameter Comparison

Parameter	AT49BV002N-90VC	SST39SF020A-55-4C-WHE	SST39SF020A-55-4I-WHE	SST39SF020A-70-4C-WHE	SST39SF020A-70-4I-WHE
Memory Size	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8	256K x 8	256K x 8
Memory Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Access Time	90 ns	55 ns	55 ns	70 ns	70 ns
Write Cycle Time	50µs	20µs	20µs	20µs	20µs
Voltage Supply Range	2.7V ~ 3.6V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package Type	32-TFSOP	32-TFSOP	32-TFSOP	32-TFSOP	32-TFSOP
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: All SST39SF020A variants are ROHS3 compliant, whereas the AT49BV002N-90VC is non-compliant. Selection of any SST39SF020A substitute satisfies modern regulatory requirements.

For Active Product Status: The AT49BV002N-90VC is obsolete. All SST39SF020A variants maintain active product status, ensuring long-term availability and manufacturing support.

For Temperature Range Flexibility: SST39SF020A-55-4I-WHE and SST39SF020A-70-4I-WHE extend operating temperature to -40°C ~ 85°C, providing broader environmental coverage compared to the 0°C ~ 70°C range of the original part.

For Voltage Supply Compatibility: The SST39SF020A series operates at 4.5V ~ 5.5V, differing from the AT49BV002N-90VC supply range of 2.7V ~ 3.6V. System-level voltage regulation and interface compatibility must be evaluated before substitution.

For Performance Enhancement: SST39SF020A variants offer faster access times (55 ns or 70 ns versus 90 ns) and significantly faster write cycle times (20µs versus 50µs), enabling improved system performance.

Frequently Asked Questions (FAQ)

Q: Can SST39SF020A parts directly replace AT49BV002N-90VC in existing designs?

A: Direct pin-compatible replacement is possible due to identical 32-TFSOP packaging and parallel interface. However, the voltage supply range difference (4.5V ~ 5.5V for SST39SF020A versus 2.7V ~ 3.6V for AT49BV002N-90VC) requires verification that system power supplies and signal levels are compatible.

Q: What is the difference between 55 ns and 70 ns access time variants?

A: Both variants meet or exceed the 90 ns access time of the original part. The 55 ns variant (SST39SF020A-55-4C-WHE, SST39SF020A-55-4I-WHE) provides faster memory access, while the 70 ns variant (SST39SF020A-70-4C-WHE, SST39SF020A-70-4I-WHE) offers a balance between performance and cost. Selection depends on system timing requirements.

Q: What packaging options are available for SST39SF020A substitutes?

A: SST39SF020A parts are available in Tray packaging (standard) and Tape & Reel (TR) packaging for automated assembly. The "-T" suffix indicates Tape & Reel packaging. Both packaging types contain identical die and electrical specifications.

Q: Why should I select the industrial temperature range variant?

A: SST39SF020A-55-4I-WHE and SST39SF020A-70-4I-WHE variants operate across -40°C ~ 85°C, compared to 0°C ~ 70°C for commercial temperature variants. Industrial variants are required for applications subject to extended temperature environments or military/aerospace specifications.

Q: Are all SST39SF020A variants RoHS compliant?

A: Yes. All SST39SF020A variants listed are ROHS3 compliant, whereas the AT49BV002N-90VC is non-compliant. This compliance difference is significant for new product designs and markets with RoHS requirements.

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