AT27C080-12RI Equivalent & Substitute Parts

Part Overview

The AT27C080-12RI is an 8Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-SOIC package with 120 ns access time. This component is classified as obsolete, indicating it is no longer in active production. Finding equivalent or substitute parts is necessary due to limited availability and the discontinuation of this product line. Substitute parts must maintain functional equivalence in memory capacity, interface type, and electrical specifications while accommodating modern supply chain availability.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Organization	1M x 8
Memory Format	EPROM
Memory Interface	Parallel
Access Time	120 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package Type	32-SOIC

Substitute Part Grouping Explanation

Substitution of the AT27C080-12RI is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide 8Mbit capacity in 1M x 8 organization to maintain data storage equivalence
Memory Technology: EPROM - OTP (One-Time Programmable) technology must be preserved for functional compatibility
Parallel Interface: The parallel memory interface is mandatory for system-level compatibility
Electrical Specifications: Supply voltage range (4.5V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) must be maintained
Mounting Type: Surface mount technology is required for PCB integration compatibility
Base Product Number: All substitutes share the AT27C080 base product number, confirming core functional equivalence

The AT27C080-90JU qualifies as a substitute based on these parameters. While it differs in package type (32-PLCC vs. 32-SOIC) and access time (90 ns vs. 120 ns), these differences represent improvements in performance and availability rather than functional incompatibility.

Parameter Comparison

Parameter	AT27C080-12RI (Main Part)	AT27C080-90JU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	8Mbit	8Mbit
Memory Organization	1M x 8	1M x 8
Memory Format	EPROM	EPROM
Memory Interface	Parallel	Parallel
Access Time	120 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package Type	32-SOIC (0.445", 11.30mm Width)	32-PLCC (13.97x11.43mm)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

The AT27C080-90JU is the qualified substitute for the AT27C080-12RI based on the following factors:

Product Status: The substitute is in active production status, ensuring ongoing availability and supply chain reliability compared to the obsolete main part
Compliance: The AT27C080-90JU achieves ROHS3 compliance, meeting modern regulatory requirements, whereas the main part is RoHS non-compliant
Performance: The 90 ns access time of the substitute represents improved performance relative to the 120 ns specification of the main part, providing operational headroom
Functional Equivalence: Both parts share identical memory capacity, organization, interface type, voltage specifications, and temperature range
Package Consideration: The 32-PLCC package differs from the 32-SOIC package of the main part. PCB layout and socket compatibility must be verified during integration

Frequently Asked Questions (FAQ)

Q: Can the AT27C080-90JU directly replace the AT27C080-12RI without design changes?

A: Functional replacement is possible due to identical memory specifications and electrical characteristics. However, the package type differs (32-PLCC vs. 32-SOIC), requiring PCB layout verification and socket compatibility assessment.

Q: What is the significance of the access time difference (120 ns vs. 90 ns)?

A: The 90 ns access time of the substitute is faster than the 120 ns specification of the main part. This represents improved performance and does not create compatibility issues in systems designed for the slower part.

Q: Why is the main part classified as obsolete?

A: Obsolete status indicates the AT27C080-12RI is no longer manufactured by Microchip Technology. The AT27C080-90JU, being in active production, provides a path to continued component availability.

Q: Are there compliance differences between the two parts?

A: Yes. The AT27C080-90JU is ROHS3 compliant, meeting current environmental and regulatory standards. The AT27C080-12RI is RoHS non-compliant, which may restrict its use in applications subject to RoHS regulations.

Q: What is the memory organization 1M x 8?

A: This indicates 1 million addressable locations, each containing 8 bits of data, totaling 8 megabits of storage capacity.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across the identical temperature range of -40°C to 85°C, ensuring thermal compatibility in equivalent applications.

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