AT49BV040-90TI Equivalent & Substitute Parts

Part Overview

The AT49BV040-90TI is a 4Mbit parallel FLASH memory IC manufactured by Microchip Technology, housed in a 32-TFSOP package with 90 ns access time. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a 2.7V to 3.6V supply range and supports temperatures from -40°C to 85°C, serving applications requiring non-volatile parallel memory storage.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	Parallel
Access Time	90 ns
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	32-TFSOP
Write Cycle Time	50µs
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the AT49BV040-90TI is determined by strict alignment of core electrical and mechanical parameters:

Primary Substitution Criteria:

Memory capacity: 4Mbit
Memory organization: 512K x 8
Interface type: Parallel
Access time: 90 ns (matching specification)
Package: 32-TFSOP
Mounting: Surface Mount

The MX29F040CTC-90G meets all primary substitution criteria with identical memory specifications and package form factor. However, the voltage supply range differs (4.5V ~ 5.5V versus 2.7V ~ 3.6V), requiring circuit-level evaluation for compatibility. The operating temperature range also differs (0°C ~ 70°C versus -40°C ~ 85°C), limiting applicability in extended temperature environments.

The MX29F040CTC-70G provides a faster 70 ns access time variant but introduces the same voltage and temperature range constraints as the 90 ns variant.

Parameter Comparison

Parameter	AT49BV040-90TI	MX29F040CTC-90G	MX29F040CTC-70G
Manufacturer	Microchip Technology	Macronix	Macronix
Memory Size	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	90 ns	90 ns	70 ns
Voltage Supply	2.7V ~ 3.6V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	32-TFSOP	32-TFSOP	32-TFSOP
Write Cycle Time	50µs	90ns	70ns
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MX29F040CTC-90G is the primary substitute candidate based on matching access time specification (90 ns) and active product status. This part is ROHS3 compliant, addressing regulatory requirements absent in the obsolete AT49BV040-90TI. Selection requires verification that system power supply can accommodate the 4.5V ~ 5.5V requirement and that operating temperature range (0°C ~ 70°C) aligns with application constraints.

MX29F040CTC-70G provides enhanced performance with 70 ns access time and identical package compatibility. This variant applies to applications where faster memory access improves system performance and where voltage and temperature operating ranges are compatible with design specifications.

Both Macronix alternatives maintain identical memory capacity, organization, and parallel interface architecture, ensuring functional compatibility at the memory subsystem level.

Frequently Asked Questions (FAQ)

Q: Can MX29F040CTC-90G directly replace AT49BV040-90TI without circuit modification?

A: Direct replacement requires verification of two parameters: supply voltage compatibility (MX29F040CTC-90G requires 4.5V ~ 5.5V versus AT49BV040-90TI's 2.7V ~ 3.6V) and operating temperature range (MX29F040CTC-90G operates 0°C ~ 70°C versus AT49BV040-90TI's -40°C ~ 85°C). If the system power supply and thermal environment fall within these ranges, pin-compatible substitution is feasible.

Q: What is the difference between MX29F040CTC-90G and MX29F040CTC-70G?

A: Both parts are functionally identical in memory capacity, organization, and package. The primary difference is access time: MX29F040CTC-70G specifies 70 ns versus 90 ns for MX29F040CTC-90G. Selection depends on system timing requirements and cost considerations.

Q: Are the Macronix parts pin-compatible with the AT49BV040-90TI?

A: Both substitute parts use the 32-TFSOP package matching the original AT49BV040-90TI. Pin compatibility is confirmed for parallel FLASH memory interface signals. Voltage supply pins require circuit-level evaluation due to different operating voltage ranges.

Q: Why is the AT49BV040-90TI classified as obsolete?

A: Microchip Technology has discontinued this product line. Active alternatives from manufacturers such as Macronix ensure continued availability and support for 4Mbit parallel FLASH memory applications.

Q: Does RoHS compliance affect substitution decisions?

A: The AT49BV040-90TI is RoHS non-compliant, while both Macronix alternatives are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the Macronix parts provide compliant alternatives.

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