AT49BV040-90TC Equivalent & Substitute Parts

Part Overview

The AT49BV040-90TC is a 4Mbit parallel FLASH memory IC manufactured by Microchip Technology, packaged in 32-TSOP with 90 ns access time. This device is classified as obsolete, making equivalent substitute parts necessary for new designs, production continuations, and legacy system maintenance. The part operates at 2.7V to 3.6V supply voltage with 512K x 8 memory organization and is suitable for applications requiring non-volatile parallel FLASH memory storage.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K 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
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT49BV040-90TC is determined by the following critical parameters:

Memory capacity (4Mbit) and organization (512K x 8)
Parallel interface architecture
32-TFSOP package compatibility
Access time specification (90 ns or faster)
Operating temperature range (0°C ~ 70°C minimum)

The substitute parts identified are both Macronix MX29F series devices that maintain identical memory capacity, organization, and package form factor. Both MX29F040CTC variants meet or exceed the access time requirement and temperature specifications. The primary distinction between substitutes is the supply voltage requirement, which differs from the original part specification.

Parameter Comparison

Parameter	AT49BV040-90TC	MX29F040CTC-70G	MX29F040CTC-90G
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	70 ns	90 ns
Write Cycle Time	50µs	70 ns	90 ns
Voltage Supply Range	2.7V ~ 3.6V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	32-TFSOP	32-TFSOP	32-TFSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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

Both MX29F040CTC variants are active production devices from Macronix with ROHS3 compliance, addressing the obsolescence of the AT49BV040-90TC. The MX29F040CTC-90G is the primary substitute, offering matching 90 ns access time specification and identical memory organization within the same 32-TFSOP package footprint.

The MX29F040CTC-70G provides faster 70 ns access time performance and is suitable for applications where improved speed is beneficial. Both devices require 4.5V to 5.5V supply voltage, which differs from the original 2.7V to 3.6V specification. System power supply architecture must be evaluated to accommodate this voltage requirement.

Frequently Asked Questions (FAQ)

Q: Can MX29F040CTC devices directly replace AT49BV040-90TC in existing designs?

A: Electrical substitution is possible for memory capacity, organization, interface type, and package compatibility. However, the supply voltage requirement differs (4.5V ~ 5.5V versus 2.7V ~ 3.6V), requiring power supply circuit modification. Pin-to-pin compatibility within the 32-TFSOP package must be verified against specific application schematics.

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

A: Both devices are identical except for access time specification. The -70G variant provides 70 ns access time, while the -90G variant matches the original 90 ns specification. Both meet or exceed the original part's performance requirements.

Q: Are the Macronix MX29F040CTC devices RoHS compliant?

A: Yes, both MX29F040CTC variants are ROHS3 compliant, whereas the original AT49BV040-90TC is RoHS non-compliant. This compliance improvement is beneficial for new designs and regulated applications.

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

A: All three devices share MSL 3 (168 Hours) rating, indicating identical moisture handling and storage requirements during manufacturing and assembly processes.

Q: Are there additional substitute options listed for the MX29F040CTC?

A: The MX29F040CTI-70G and SST39SF040-70-4C-WHE are documented as additional substitutes within the Macronix product family, offering alternative sourcing options with equivalent memory specifications.

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