AT27C080-90JC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C080-90JC is an 8Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement. The part operates with a 90 ns access time and requires a 4.5V to 5.5V supply voltage, making it suitable for legacy embedded systems and industrial applications requiring non-volatile memory storage.

Key Parameters

Parameter	Value
Memory Size	8Mbit
Memory Organization	1M x 8
Memory Format	EPROM
Memory Interface	Parallel
Access Time	90 ns
Voltage Supply	4.5V ~ 5.5V
Package Type	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

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

Memory capacity (8Mbit) and organization (1M x 8)
Memory technology (EPROM - OTP)
Parallel interface architecture
Access time specification (90 ns)
Supply voltage range (4.5V ~ 5.5V)
Physical package (32-PLCC with identical dimensions)
Surface mount mounting type

The AT27C080-90JU qualifies as a direct substitute based on identical electrical specifications and package geometry. Differences in product status, operating temperature range, and compliance certifications do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Parameter	AT27C080-90JC (Main)	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	90 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Not specified	Tube

Engineering Selection Recommendations

The AT27C080-90JU is the direct functional equivalent for the obsolete AT27C080-90JC. Selection between these parts should be based on the following criteria:

AT27C080-90JU is preferred when:

Active component procurement is required (Active product status vs. Obsolete)
RoHS3 compliance is mandated by system specifications or regulatory requirements
Extended operating temperature range (-40°C to 85°C) is necessary for the application environment
Long-term component availability and supply chain continuity are priorities

AT27C080-90JC remains applicable when:

Existing inventory stock is available and cost optimization is the primary objective
Legacy system maintenance requires exact part number matching for documentation purposes
Operating conditions remain within the 0°C to 70°C temperature specification

Both parts are electrically and mechanically interchangeable within their specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can AT27C080-90JU directly replace AT27C080-90JC in existing designs?

A: Yes. Both parts share identical electrical specifications (8Mbit capacity, 90 ns access time, 4.5V–5.5V supply) and physical packaging (32-PLCC). Direct substitution is possible without circuit modification.

Q: What is the primary difference between these two part numbers?

A: The AT27C080-90JU has an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and is RoHS3 compliant, whereas the AT27C080-90JC is obsolete and RoHS non-compliant. Electrical performance is identical.

Q: Does the extended temperature range of AT27C080-90JU affect compatibility?

A: No. Extended temperature range is a superset capability. If the original design operates within 0°C to 70°C, the AT27C080-90JU will function identically. The wider range provides additional operational flexibility without compromising compatibility.

Q: Are there packaging differences between these parts?

A: Both use 32-PLCC surface mount packages with identical dimensions (13.97 x 11.43 mm). The AT27C080-90JU is supplied in Tube packaging, while the AT27C080-90JC packaging specification is not detailed. This does not affect electrical or mechanical interchangeability.

Q: Which part should be selected for new designs?

A: The AT27C080-90JU should be selected for new designs due to active product status, RoHS3 compliance, and extended temperature range. The AT27C080-90JC is obsolete and should not be specified for new applications.

Q: Is the AT27C080-90JU programmable through DiGi-Electronics?

A: The AT27C080-90JU is verified as programmable through DiGi-Electronics, whereas the AT27C080-90JC is not verified. This distinction may be relevant for programming and verification workflows.

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