AT27C020-90JC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C020-90JC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology, housed in a 32-PLCC package with 90 ns access time. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement.

Substiute Parts

AT27C020-90JC

Microchip TechnologyIn Stock: 1296AT27C020-90JC Datasheet

Current PartRFQ

AT27C020-90JU

Microchip TechnologyIn Stock: 2114AT27C020-90JU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-90JC is determined by strict equivalence across the following critical parameters:

• Memory capacity and organization (2Mbit, 256K 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 AT27C020-90JU qualifies as a direct substitute based on identical values across all these parameters. Differences in operating temperature range, product status, and compliance certifications do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-90JU is the direct functional equivalent for the obsolete AT27C020-90JC. Selection of the substitute part is justified on the following grounds:

• All electrical parameters match exactly: memory capacity, organization, interface type, access time, and supply voltage
• Physical package dimensions and mounting type are identical, ensuring PCB compatibility without layout modification
• The AT27C020-90JU maintains active production status, ensuring long-term availability
• ROHS3 compliance of the substitute part aligns with current environmental and regulatory standards
• Extended operating temperature range (-40°C ~ 85°C) of the substitute provides broader application flexibility compared to the original specification (0°C ~ 70°C)

For applications requiring the original temperature specification only, the substitute part remains fully compatible and functional within the 0°C ~ 70°C window.

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90JU be used as a direct replacement for the AT27C020-90JC without PCB modifications?

A: Yes. Both parts use identical 32-PLCC packages with matching pin configurations, electrical specifications, and mechanical dimensions. No PCB layout changes are required.

Q: What is the primary reason for substitution?

A: The AT27C020-90JC is obsolete. The AT27C020-90JU is the active production equivalent from the same manufacturer with identical functional specifications.

Q: Are there differences in programming or initialization procedures?

A: No differences are specified in the provided parameters. Both parts implement the same EPROM technology and parallel interface architecture.

Q: Does the extended temperature range of the AT27C020-90JU affect compatibility?

A: No. The extended range (-40°C ~ 85°C) is a superset of the original specification (0°C ~ 70°C). The substitute part functions correctly within the original temperature window and beyond.

Q: What is the significance of RoHS compliance difference?

A: The AT27C020-90JU meets ROHS3 standards, reflecting current manufacturing and environmental regulations. The original part's non-compliance status does not affect electrical function but may impact procurement policies and long-term supply chain viability.

Q: Are packaging options different between the two parts?

A: The AT27C020-90JC is supplied in standard packaging. The AT27C020-90JU is supplied in tube packaging. Both use identical 32-PLCC components; packaging format does not affect component function or PCB integration.