AT27C080-90JI Equivalent & Substitute Parts

Part Overview

The AT27C080-90JI is an 8Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC package with 90 ns access time. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement. The AT27C080-90JI operates within the 4.5V to 5.5V supply voltage range and supports industrial temperature specifications from -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Organization	1M x 8
Memory Format	EPROM
Memory Interface	Parallel
Access Time	90 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TC)
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT27C080-90JI is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (8Mbit, 1M x 8 configuration)
Memory technology (EPROM - OTP)
Access time specification (90 ns)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Package and pinout compatibility (32-PLCC with J-Lead configuration)
Parallel interface architecture

The AT27C080-90JU meets all these criteria and is therefore a direct functional equivalent. Both parts share the same base product number (AT27C080) and identical electrical and mechanical specifications.

Parameter Comparison

Parameter	AT27C080-90JI	AT27C080-90JU
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	90 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TC)
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The AT27C080-90JU is the direct substitute for the AT27C080-90JI. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product lifecycle status: the AT27C080-90JI is obsolete while the AT27C080-90JU remains in active production.

For new designs or component replenishment, the AT27C080-90JU is the appropriate selection due to its active product status and ROHS3 compliance. The AT27C080-90JU also carries verified programmability certification through DiGi-Electronics, whereas the AT27C080-90JI programmability status is unverified.

Frequently Asked Questions (FAQ)

Q: Can the AT27C080-90JU directly replace the AT27C080-90JI in existing applications?

A: Yes. Both parts are functionally equivalent across all electrical and mechanical parameters, including memory capacity, access time, voltage supply range, operating temperature, and 32-PLCC package configuration. Direct substitution is supported without circuit modification.

Q: What is the difference between the AT27C080-90JI and AT27C080-90JU?

A: The parts are electrically and mechanically identical. The AT27C080-90JU differs in product status (active versus obsolete), packaging format (tube versus unspecified for the JI variant), RoHS compliance status (ROHS3 compliant versus non-compliant), and programmability verification status.

Q: Are there any compatibility concerns with the 32-PLCC package?

A: No. Both parts use identical 32-PLCC (J-Lead) surface mount packaging with dimensions of 13.97 x 11.43 mm. Footprint and pinout compatibility is guaranteed.

Q: What supply voltage range do these parts support?

A: Both the AT27C080-90JI and AT27C080-90JU operate within a 4.5V to 5.5V supply voltage range, supporting standard 5V logic systems.

Q: What is the access time specification?

A: Both parts specify 90 ns access time for parallel memory read operations.

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