AT49BV002T-90VC Equivalent & Substitute Parts

Part Overview

The AT49BV002T-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 equivalent substitute parts necessary for ongoing design support and production continuity. The part operates across 2.7V to 3.6V supply voltage with 256K x 8 memory organization and is non-RoHS compliant.

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-VSOP / 32-TFSOP
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT49BV002T-90VC is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes maintain 2Mbit capacity with 256K x 8 organization
Memory Interface: Parallel interface compatibility is required
Package Compatibility: Physical footprint must match 32-VSOP / 32-TFSOP dimensions (0.488", 12.40mm width)
Voltage Supply Range: Substitutes must support the 2.7V ~ 3.6V range or be compatible with the original supply voltage
Access Time: Substitutes with equal or faster access time (≤90 ns) are electrically compatible
Write Cycle Time: Substitutes with equal or faster write cycle time (≤50µs) maintain functional compatibility

The substitute parts listed below meet these criteria while offering improved product status (Active) and RoHS3 compliance.

Parameter Comparison

Parameter	AT49BV002T-90VC	SST39LF020-55-4C-WHE	SST39VF020-70-4C-WHE	SST39VF020-70-4C-WHE-T	SST39VF020-70-4I-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	70 ns	70 ns	70 ns
Write Cycle Time	50µs	20µs	20µs	20µs	20µs
Voltage Supply Range	2.7V ~ 3.6V	3V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	32-VSOP	32-VSOP	32-TSOP	32-TSOP	32-TSOP
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	-	Tray	Tray	Tape & Reel	Tray

Engineering Selection Recommendations

SST39LF020-55-4C-WHE is the primary substitute for direct pin-compatible replacement. It maintains the 32-VSOP package, offers superior access time (55 ns vs. 90 ns), and achieves ROHS3 compliance. The voltage supply range is 3V ~ 3.6V, which is compatible with designs operating at 3V or higher. This part is recommended for applications where the lower voltage threshold of 2.7V is not required.

SST39VF020-70-4C-WHE and SST39VF020-70-4C-WHE-T provide full voltage range compatibility (2.7V ~ 3.6V) matching the original part. These parts use the 32-TSOP package instead of 32-VSOP, requiring PCB layout modification. Both are ROHS3 compliant and active products. The -T variant is supplied in Tape & Reel format for automated assembly.

SST39VF020-70-4I-WHE extends the operating temperature range to -40°C ~ 85°C, suitable for industrial and extended-temperature applications. This part also uses the 32-TSOP package and maintains full voltage compatibility. All substitute parts feature improved write cycle time (20µs vs. 50µs).

Frequently Asked Questions (FAQ)

Q: Can SST39LF020-55-4C-WHE be used as a direct replacement for AT49BV002T-90VC?

A: SST39LF020-55-4C-WHE is pin-compatible and maintains the same 32-VSOP package. However, the voltage supply range is 3V ~ 3.6V instead of 2.7V ~ 3.6V. It is suitable for replacement only in designs operating at 3V or higher supply voltage.

Q: What is the difference between SST39VF020-70-4C-WHE and SST39VF020-70-4C-WHE-T?

A: Both parts are electrically identical with 70 ns access time and full voltage compatibility (2.7V ~ 3.6V). The primary difference is packaging format: SST39VF020-70-4C-WHE is supplied in Tray format, while SST39VF020-70-4C-WHE-T is supplied in Tape & Reel format for automated pick-and-place assembly.

Q: Do substitute parts require PCB layout changes?

A: SST39LF020-55-4C-WHE maintains the original 32-VSOP package and requires no layout changes. SST39VF020-70-4C-WHE, SST39VF020-70-4C-WHE-T, and SST39VF020-70-4I-WHE use the 32-TSOP package, which has the same 0.488" (12.40mm) width but different pin configuration, requiring PCB redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitutes are ROHS3 compliant, whereas the original AT49BV002T-90VC is non-compliant.

Q: Which substitute is recommended for industrial temperature applications?

A: SST39VF020-70-4I-WHE supports the extended operating temperature range of -40°C ~ 85°C, making it suitable for industrial environments.

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