AT49BV001-90VC Equivalent & Substitute Parts

Part Overview

The AT49BV001-90VC 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 a 2.7V to 3.6V supply voltage range and supports standard parallel memory interface protocols typical of legacy embedded systems and industrial applications.

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	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 AT49BV001-90VC is determined by strict equivalence across the following critical parameters:

Memory capacity: 1Mbit (128K x 8 organization)
Interface type: Parallel
Package footprint: 32-TFSOP (0.488", 12.40mm Width)
Supply voltage compatibility: 2.7V ~ 3.6V
Operating temperature range: 0°C ~ 70°C
Technology: FLASH non-volatile memory

The SST39VF010-70-4C-WHE meets all substitution criteria. While it offers improved performance characteristics (70 ns access time versus 90 ns, 20µs write cycle versus 50µs), these enhancements maintain full backward compatibility with the original part's electrical and mechanical specifications.

Parameter Comparison

Parameter	AT49BV001-90VC	SST39VF010-70-4C-WHE	Compatibility
Memory Size	1Mbit	1Mbit	Equivalent
Memory Organization	128K x 8	128K x 8	Equivalent
Memory Interface	Parallel	Parallel	Equivalent
Access Time	90 ns	70 ns	Improved
Write Cycle Time	50µs	20µs	Improved
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	Equivalent
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Equivalent
Package Type	32-TFSOP	32-TFSOP	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Product Status	Obsolete	Active	Substitute is active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Substitute is compliant

Engineering Selection Recommendations

The SST39VF010-70-4C-WHE is the direct substitute for AT49BV001-90VC applications. Selection is based on the following factors:

The substitute maintains identical memory capacity, organization, and parallel interface specifications
Package footprint compatibility ensures direct PCB layout reuse without redesign
Electrical specifications remain within the same supply voltage and operating temperature ranges
The substitute is classified as active product status, ensuring long-term availability and supply chain continuity
ROHS3 compliance of the substitute addresses regulatory requirements for new production
Performance improvements (faster access time and write cycle) provide operational benefits without introducing compatibility issues

Frequently Asked Questions (FAQ)

Q: Can SST39VF010-70-4C-WHE be used as a direct replacement for AT49BV001-90VC?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, package footprint (32-TFSOP), supply voltage range (2.7V ~ 3.6V), and operating temperature range (0°C ~ 70°C). The substitute is pin-compatible and functionally equivalent.

Q: What are the performance differences between these parts?

A: The SST39VF010-70-4C-WHE offers faster access time (70 ns versus 90 ns) and faster write cycle time (20µs versus 50µs). These improvements are backward compatible and do not affect system integration.

Q: Are there packaging differences?

A: Both parts use the 32-TFSOP package with identical 0.488" (12.40mm) width. PCB footprints are directly compatible.

Q: What is the compliance status difference?

A: The AT49BV001-90VC is RoHS non-compliant, while SST39VF010-70-4C-WHE is ROHS3 compliant. For new designs and production, the compliant substitute is required.

Q: Is the substitute available in the same packaging format?

A: The substitute is supplied in Tray packaging, while the original part specification does not specify packaging format. Both are surface-mount components in identical package types.

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