AT49BV002T-12VC Equivalent & Substitute Parts

Part Overview

The AT49BV002T-12VC is a 2Mbit parallel FLASH memory IC manufactured by Microchip Technology, organized as 256K x 8 with a 120 ns access time. This device operates at 2.7V to 3.6V supply voltage and is housed in a 32-VSOP surface mount package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. Substitute parts maintain core electrical and mechanical compatibility while offering improved performance characteristics and active product status.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	120 ns
Voltage Supply Range	2.7V ~ 3.6V
Write Cycle Time	50µs
Package Type	32-TFSOP (0.488", 12.40mm Width)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT49BV002T-12VC is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide 2Mbit capacity with 256K x 8 organization to ensure pin-compatible operation and identical address/data bus requirements.
Memory Interface: Parallel interface is mandatory for direct replacement without circuit redesign.
Supply Voltage Compatibility: Operating range must encompass 2.7V ~ 3.6V to function in existing power delivery systems.
Package & Pinout: 32-TFSOP package with 0.488" width ensures mechanical and electrical compatibility on printed circuit boards designed for the original part.
Access Time: Substitute parts with equal or faster access time (≤120 ns) maintain or improve system timing margins.

The SST39VF020 series parts listed below satisfy all substitution criteria. Both variants operate at identical supply voltages, memory capacity, and package specifications. Differences in access time (70 ns vs. 120 ns) and operating temperature range represent performance enhancements rather than compatibility constraints.

Parameter Comparison

Parameter	AT49BV002T-12VC	SST39VF020-70-4C-WHE	SST39VF020-70-4I-WHE
Memory Size	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	120 ns	70 ns	70 ns
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Write Cycle Time	50µs	20µs	20µs
Package Type	32-TFSOP	32-TFSOP	32-TFSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SST39VF020-70-4C-WHE is suitable for applications requiring the original 0°C to 70°C operating temperature range. This part provides faster access time (70 ns) and write cycle time (20µs) compared to the AT49BV002T-12VC, with ROHS3 compliance and active product status ensuring long-term availability.

SST39VF020-70-4I-WHE extends the operating temperature range to -40°C to 85°C, accommodating industrial and extended-temperature applications. This variant maintains identical electrical performance to the -4C version while supporting wider environmental conditions. ROHS3 compliance and active status provide supply chain continuity.

Both substitutes eliminate obsolescence risk associated with the AT49BV002T-12VC while maintaining full electrical and mechanical compatibility. Selection between the two variants depends solely on operating temperature requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Are SST39VF020 parts pin-compatible with AT49BV002T-12VC?

A: Yes. Both parts use the 32-TFSOP package with identical pinout and electrical interface. Direct board-level substitution is possible without circuit modification.

Q: Can the faster access time of SST39VF020 (70 ns) cause compatibility issues?

A: No. Faster access time improves system timing margins and is backward compatible with designs specified for 120 ns access time. No circuit changes are required.

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

A: The primary difference is operating temperature range. The -4C variant operates 0°C to 70°C, while the -4I variant operates -40°C to 85°C. Both provide identical electrical performance and package specifications. Selection depends on application environmental requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SST39VF020 variants are ROHS3 compliant, whereas the AT49BV002T-12VC is non-compliant. This compliance improvement supports modern manufacturing and environmental standards.

Q: What is the moisture sensitivity level for these parts?

A: All three parts share MSL 3 (168 Hours) rating, indicating identical moisture handling and storage requirements.

Q: Why is the AT49BV002T-12VC classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. SST39VF020 series parts provide equivalent functionality with active production status, ensuring availability for new designs and production support.

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