AT49F008AT-90RI Equivalent & Substitute Parts

Part Overview

The AT49F008AT-90RI is an 8Mbit parallel FLASH memory IC manufactured by Microchip Technology in a 44-SOIC package with 90 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a 4.5V to 5.5V supply range and supports industrial temperature specifications from -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Format	FLASH
Memory Organization	1M x 8, 512K x 16
Memory Interface	Parallel
Access Time	90 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	44-SOIC
Mounting Type	Surface Mount
Write Cycle Time	50µs

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Memory capacity (8Mbit)
Memory format (FLASH technology)
Memory organization (1M x 8 minimum)
Parallel interface architecture
Package compatibility (44-pin SOIC/SOP form factor)
Access time performance (90 ns or faster)
Supply voltage compatibility (4.5V ~ 5.5V or subset thereof)
Operating temperature range (must support -40°C ~ 85°C or equivalent industrial range)

The AT49F008AT-12TC qualifies as a direct Microchip equivalent with identical memory specifications but different packaging and thermal characteristics. The Macronix MX29LV800 series parts meet core memory and interface requirements with active product status, though voltage supply ranges differ from the original specification.

Parameter Comparison

Parameter	AT49F008AT-90RI	AT49F008AT-12TC	MX29LV800CBMC-90G	MX29LV800CBMI-70G	MX29LV800CTMC-70G	MX29LV800CTMC-90G
Manufacturer	Microchip	Microchip	Macronix	Macronix	Macronix	Macronix
Memory Size	8Mbit	8Mbit	8Mbit	8Mbit	8Mbit	8Mbit
Memory Format	FLASH	FLASH	FLASH - NOR	FLASH - NOR	FLASH - NOR	FLASH - NOR
Memory Organization	1M x 8, 512K x 16	1M x 8, 512K x 16	1M x 8	1M x 8	1M x 8	1M x 8
Access Time	90 ns	120 ns	90 ns	70 ns	70 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	44-SOIC	40-TFSOP	44-SOIC	44-SOIC	44-SOIC	44-SOIC
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct pin-compatible replacement with identical electrical specifications, the AT49F008AT-12TC remains available from Microchip but carries obsolete product status. This part maintains the same 4.5V to 5.5V supply voltage and memory organization as the original AT49F008AT-90RI, though it operates at 120 ns access time and is packaged in 40-TFSOP format rather than 44-SOIC.

The Macronix MX29LV800 series (MX29LV800CBMC-90G, MX29LV800CBMI-70G, MX29LV800CTMC-70G, MX29LV800CTMC-90G) offers active product status with ROHS3 compliance. These parts provide 8Mbit capacity in 44-SOIC packaging with parallel interface architecture. Critical design consideration: Macronix parts operate at 2.7V to 3.6V supply voltage, which differs from the original 4.5V to 5.5V specification. The MX29LV800CBMI-70G supports the full industrial temperature range (-40°C to 85°C) matching the original part's thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can the AT49F008AT-12TC directly replace the AT49F008AT-90RI?

A: The AT49F008AT-12TC shares identical memory capacity, organization, and supply voltage specifications. However, it uses a 40-TFSOP package instead of 44-SOIC, requiring PCB layout modification. Access time is 120 ns versus 90 ns on the original part.

Q: What is the primary limitation when substituting Macronix MX29LV800 parts?

A: The Macronix series operates at 2.7V to 3.6V supply voltage, whereas the AT49F008AT-90RI requires 4.5V to 5.5V. Direct substitution requires voltage regulation or system redesign. The MX29LV800CBMI-70G is the only Macronix option supporting the full -40°C to 85°C industrial temperature range.

Q: Are all substitute parts pin-compatible with the original 44-SOIC package?

A: The AT49F008AT-12TC uses 40-TFSOP packaging and is not pin-compatible. All Macronix MX29LV800 parts are available in 44-SOIC packaging and are mechanically compatible with the original footprint.

Q: What compliance advantages do the Macronix parts offer?

A: All Macronix MX29LV800 series parts carry ROHS3 compliance and active product status, ensuring long-term availability and environmental regulation adherence. The original Microchip parts are RoHS non-compliant and obsolete.

Q: Which substitute part best matches the original specifications?

A: The MX29LV800CBMI-70G provides 44-SOIC packaging, 70 ns access time (faster than the original 90 ns), and full industrial temperature range (-40°C to 85°C). The primary design consideration remains the 2.7V to 3.6V supply voltage requirement.

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