AT49F040-70TI Equivalent & Substitute Parts

Part Overview

The AT49F040-70TI is a 4Mbit parallel FLASH memory IC manufactured by Microchip Technology, packaged in a 32-TSOP surface mount configuration. This device operates with a 70 ns access time and supports parallel memory interface architecture with 512K x 8 organization. The product is currently classified as obsolete, making substitute part identification essential for ongoing system support and component procurement.

Substiute Parts

AT49F040-70TI

Microchip TechnologyIn Stock: 809AT49F040-70TI Datasheet

Current PartRFQ

MX29F040CTC-90G

MacronixIn Stock: 2570MX29F040CTC-90G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT49F040-70TI is determined by strict alignment of the following parameters:

• Memory capacity: 4Mbit
• Memory organization: 512K x 8 bit configuration
• Interface type: Parallel architecture
• Package form factor: 32-TSOP surface mount
• Supply voltage range: 4.5V to 5.5V compatibility
• Access time specification: 70 ns or faster

The MX29F040CTC-90G qualifies as a functional substitute based on matching memory size, organization, parallel interface, package type, and voltage supply range. While the access time specification differs (90 ns versus 70 ns), this represents a slower performance characteristic that does not prevent substitution in applications where the original 70 ns timing was not a critical design constraint.

Parameter Comparison

Engineering Selection Recommendations

The MX29F040CTC-90G is an active product with ROHS3 compliance, providing regulatory advantage over the obsolete AT49F040-70TI. Both devices share identical memory capacity, organization, parallel interface architecture, and package form factor. The primary technical difference is the access time specification: the substitute operates at 90 ns compared to the original 70 ns. This performance difference must be evaluated against specific application timing requirements.

The operating temperature range of the MX29F040CTC-90G (0°C ~ 70°C) is narrower than the AT49F040-70TI (-40°C ~ 85°C). Applications requiring extended temperature operation below 0°C or above 70°C require verification of system thermal management and operational envelope compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MX29F040CTC-90G directly replace the AT49F040-70TI in existing designs?

A: Direct replacement is possible from a physical and electrical standpoint. Both devices use identical 32-TSOP packaging, support the same 4.5V to 5.5V supply voltage, and provide 512K x 8 parallel memory organization. However, the slower 90 ns access time must be evaluated against circuit timing specifications. If the original design relied on the 70 ns access time as a critical parameter, system-level timing analysis is required.

Q: What is the impact of the narrower operating temperature range on the MX29F040CTC-90G?

A: The substitute operates from 0°C to 70°C, compared to the original -40°C to 85°C range. Applications operating outside this window require alternative solutions. Standard industrial and commercial temperature environments typically fall within the MX29F040CTC-90G specification.

Q: Does the ROHS3 compliance of the MX29F040CTC-90G affect compatibility?

A: ROHS3 compliance indicates the substitute meets current environmental and regulatory standards. This provides procurement and supply chain advantages. No functional incompatibility results from this compliance status.

Q: Are there additional substitute options beyond MX29F040CTC-90G?

A: The MX29F040CTI-70G and SST39SF040-70-4C-WHE are listed as additional substitutes for the MX29F040CTC-90G. These alternatives maintain the same core memory specifications and package type, with variations in access time and manufacturer implementation.