AT49BV002NT-90VC Equivalent & Substitute Parts

Part Overview

The AT49BV002NT-90VC is a 2Mbit 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 equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a 2.7V to 3.6V supply range and supports standard parallel memory interface protocols.

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 AT49BV002NT-90VC is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts maintain 2Mbit capacity with 256K x 8 organization, ensuring functional equivalence at the memory interface level.
Parallel Interface: All substitutes retain parallel memory interface architecture, preserving pin-level compatibility within package constraints.
Supply Voltage Compatibility: Substitute parts operate within or encompass the original 2.7V ~ 3.6V range, ensuring power supply compatibility.
Package Footprint: Substitutes use 32-TFSOP or 32-VSOP packages with identical 0.488" (12.40mm) width, maintaining PCB layout compatibility.
Access Time: Substitute parts feature equal or faster access times (55 ns to 70 ns), providing performance equivalence or improvement.
Write Cycle Time: All substitutes maintain 20µs write cycle time, meeting or exceeding the original 50µs specification.

The SST39 series parts (SST39LF020 and SST39VF020 base numbers) are manufacturer-recommended substitutes with active product status and RoHS3 compliance, addressing the obsolescence of the AT49BV002NT-90VC.

Parameter Comparison

Parameter	AT49BV002NT-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
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-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

SST39LF020-55-4C-WHE is the primary substitute for applications requiring the fastest access time (55 ns) within the standard industrial temperature range (0°C ~ 70°C). This part is RoHS3 compliant and maintains active product status. Note that the supply voltage range is restricted to 3V ~ 3.6V, which excludes designs requiring operation below 3V.

SST39VF020-70-4C-WHE and SST39VF020-70-4C-WHE-T are functionally equivalent substitutes with 70 ns access time and full 2.7V ~ 3.6V supply voltage compatibility, matching the original part's voltage specification. Both are RoHS3 compliant and active products. The primary difference is packaging: the -WHE variant is supplied in Tray, while the -WHE-T variant is supplied in Tape & Reel format.

SST39VF020-70-4I-WHE extends the operating temperature range to -40°C ~ 85°C, making it suitable for industrial and extended-temperature applications. This part maintains full voltage compatibility (2.7V ~ 3.6V) and RoHS3 compliance with active product status.

All substitute parts provide improved write cycle time (20µs versus 50µs) and equal or superior access time performance compared to the obsolete AT49BV002NT-90VC.

Frequently Asked Questions (FAQ)

Q: Can SST39LF020-55-4C-WHE be used as a direct replacement for AT49BV002NT-90VC?

A: SST39LF020-55-4C-WHE is functionally compatible for memory capacity, organization, and interface. However, the supply voltage range is limited to 3V ~ 3.6V. If your design operates below 3V, this part is not suitable. For full voltage compatibility, use SST39VF020-70-4C-WHE or SST39VF020-70-4I-WHE.

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

A: Both parts are electrically and functionally identical with 70 ns access time and 2.7V ~ 3.6V supply voltage compatibility. The difference is packaging: -WHE is supplied in Tray format, while -WHE-T is supplied in Tape & Reel format. Select based on your assembly process requirements.

Q: Is SST39VF020-70-4I-WHE compatible with standard industrial temperature applications?

A: Yes. SST39VF020-70-4I-WHE operates across -40°C ~ 85°C, which encompasses standard industrial temperature ranges. This part is suitable for applications requiring extended temperature performance beyond the standard 0°C ~ 70°C range.

Q: Are all substitute parts RoHS compliant?

A: Yes. All four substitute parts (SST39LF020-55-4C-WHE, SST39VF020-70-4C-WHE, SST39VF020-70-4C-WHE-T, and SST39VF020-70-4I-WHE) are ROHS3 compliant, whereas the original AT49BV002NT-90VC is RoHS non-compliant.

Q: Do the substitute parts maintain the same package footprint?

A: All substitute parts use 32-TFSOP or 32-VSOP packages with identical 0.488" (12.40mm) width. PCB layout compatibility is maintained. Verify pin assignment compatibility with your specific circuit design.

Q: What is the inventory status of these substitute parts?

A: SST39LF020-55-4C-WHE has 1,458 units in stock. SST39VF020-70-4C-WHE has 3,787 units in stock. SST39VF020-70-4C-WHE-T has 2,200 units in stock. SST39VF020-70-4I-WHE has 17,660 units in stock.

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